Electricity Y4
Short Description
BWI Learning Module Y4...
Description
Republic of the Philippines
Department of Education PUBLIC TECHNICAL-VOCATIONAL HIGH SCHOOLS
mhar
cueto
Unit of Competency: PERFORM ROUGHING-IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM
Module No.:
1
Module Title: PERFORMING ROUGHINGIN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM
ACKNOWLEDGMENT Copyright Department of Education 2008 First Published JUNE 2008 This draft was prepared during the Competency-Based Learning Materials Development Workshop conducted at the Marikina Hotel, Marikina City on February 18-22, 2008 and finalized on May 23-25, 2008 at the Development Academy of the Philippines (DAP), Tagaytay City. This learning instrument was developed by the following personnel: Technology Teacher: Mr. Noel M. Espineli General Mariano Alvarez Technical High School GMA, Cavite Contextual Teacher: Ms. Gina C. delos Santos A.F.G.Bernardino Memorial Trade School Lias Marilao, Bulacan Facilitator: Dr. Corazon L. Echano Project Coordinator DepED-TechVoc Task Force Encoders: Ms. Catherine Pearl Sevilleno Fund: Department of Education REFERENCES AND FURTHER READING 1. Agpaoa, Feleciano. Interior and Exterior Wiring Troubleshooting; National Bookstore: 1991. 2. Azares, Efren F. and Recana, Cirilo B. Practical Electricity III; Adriana Publishing: 1999. 3. Philippine Electrical Code; Year 2000 Edition; Volume I by the Institute of Integrated Electrical Engineers of the Philippines. First Printing June 2002. 4. www.google.com 5. www.yahoo.com
TABLE OF CONTENTS Page How to Use this Module ................................................................................... i Introduction .................................................................................................... ii Technical Terms ............................................................................................. iii Learning Outcome 1: Layout and install telephone terminal Cabinets and frame ......................................................................................... 1 Learning Experiences/Activities ............................................................. 2 Information Sheet 1.1 ............................................................................ 3 Self-Check 1.1 ....................................................................................... 7 Operation Sheet 1.1 ............................................................................... 8 Learning outcomes 2: Layout and install wire ways ....................................... 11 Learning Experiences/Activities ........................................................... 12 Information sheet 2.1 .......................................................................... 13 Self check 2.1 ...................................................................................... 17 Operation sheet 2.1 ............................................................................. 18 Learning Outcomes 3: Layout and install cabinet tray/cable tray .................. 20 Learning Experiences/Activities ........................................................... 21 Information sheet 3.1 .......................................................................... 22 Self check 3.1 ...................................................................................... 27 Operation sheet 3.1 ............................................................................. 28 Assessment Plan…………………………………………………………………………….30 Observation checklist…………………………………………………….......................31 Observation and Questioning checklist………………………………………………..32 Demonstration……………………………………………………………………………….33 Written Report……………………………………………………………………………….34 Performance test…………………………………………………………………………….35 Answer key 1.1 ............................................................................................. 36 Answer key 2.1 ............................................................................................. 36 Answer key 3.1 ............................................................................................. 36
HOW TO USE THIS MODULE Welcome to the Module “Performing Roughing-in Activities for Communication and Distribution System”. This module contains training materials and activities for you to complete. The unit of competency “Perform Roughing-in Activities for Communication and Distribution System” contains the knowledge, skills and attitudes required for Building Wiring Installation course required to obtain the National Certificate (NC) level II. You are required to go through a series of learning activities in order to complete each of the learning outcomes of the module. In each learning outcome there are Information Sheets, Operation Sheets and Activity Sheets. Do these activities on your own and answer the Self-Check at the end of each learning activity. If you have questions, do not hesitate to ask your teacher for assistance. Recognition of Prior Learning (RPL) You may already have some basic knowledge and skills covered in this module. If you can demonstrate competence to your teacher in a particular skill, talk to your teacher so you do not have to undergo the same training again. If you have a qualification or Certificate of Competency from previous trainings, show it to him/her. If the skills you acquired are consistent with and relevant to this module, they become part of the evidence. You can present these for RPL. If you are not sure about your competence/skills, discuss this with your teacher. After completing this module, ask your teacher to assess your competence. Result of your assessment will be recorded in your competency profile. All the learning activities are designed for you to complete at your own pace. In this module, you will find the activities for you to complete and relevant information sheets for each learning outcome. Each learning outcome may have more than one learning activity. This module is prepared to help you achieve the required competency, in receiving and relaying information. This will be the source of information that will enable you to acquire the knowledge and skills in Building Wiring Installation NC level II independently at your own pace with minimum supervision from your teacher.
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Program/Course:
BUILDING WIRING INSTALLATION NC II
Unit of Competency:
PERFORM ROUGHING-IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM
Module Title:
Performing Roughing-in Activities for Communication and Distribution System
INTRODUCTION: This module contains information and suggested learning activities on Performing Roughing-in Activities for Communication and Distribution System. It includes instructions and procedure on how to install telephone terminals, cabinet and frames, wire ways, cable tray and cable bridge. Completion of this module will help you understand the succeeding module on performing roughing-in activities for communication and distribution system. This module consists of three (3) learning outcomes. Each learning outcome contains learning activities with instruction sheets. Before you follow the instruction, read the information sheets and answer the self-check and activities provided to assess your competence by your teacher. He/she will check if you have acquired the knowledge necessary to perform the skill portion of the particular learning outcome. Upon completing this module, report to your teacher for assessment. If you pass the assessment, you will be given a certificate of completion. SUMMARY OF LEARNING OUTCOMES Upon completion of the module you should be able to: LO1 Layout and install telephone terminal cabinets and frame LO2 Layout and install wire ways LO3 Layout and install cabinet tray/cable tray ASSESSMENT CRITERIA Refer to assessment criteria of learning outcomes 1-3 of this module. PREREQUISITES Basic and Common Competencies
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TECHNICAL TERMS Ground Bending Cable Cable tray Fittings Rigid PEC PPE Corrosive vapor Wire way
is an earth or some conducting body that serve in placed of the earth ground. an effective connection of metallic parts to form a conducive parts. An assembly of two o more conductors. a cable support assembly. is any associated materials for connecting end of stock securely. refers to firmness, permanent and hard. refers to Philippine Electrical Code. refers to Personal protective equipment. is any harmful, poisonous substance. is a unit of assembly use for protecting electric wires and cables.
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Program/Course:
BUILDING WIRING INSTALLATION NC II
Unit of Competency:
PERFORM ROUGHING-IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM
Module Title:
Performing Roughing-In Activities for Communication and Distribution System
Learning Outcome 1:
Layout and install telephone terminal cabinets and frame
Assessment Criteria 1. Philippine Electrical Code (PEC) provisions in the uses, application and installation of telephone terminal cabinet are strictly followed. 2. Telephone terminal cabinets are leveled horizontally and vertically aligned to the structure in line with job requirements. 3. Telephone terminal cabinet is installed in line with job requirements. 4. Tools/equipment needed for the installation are prepared in line with job requirements. 5. Personal safety in installing telephone terminal cabinet is followed. 6. Workplace is cleaned and made safe upon completion of work according to established standard. Resources 6. Philippine Electrical Code; Year 2000 Edition; Volume I by the Institute of Integrated Electrical Engineers of the Philippines. First Printing June 2002. 7. www.google.com 8. www.yahoo.com
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LEARNING EXPERIENCES/ACTIVITIES Learning Outcome 1: Layout and Install Telephone Terminal Cabinet Learning Activities
Special Instructions
1. Read the attached information sheet 1.1 about the installation of telephone terminal cabinets and frame
Do not write anything on the module, provide extra paper in doing the self check and activity sheets.
2. Identify tools and materials used in installing telephone terminal cabinet.
Choose tools and materials used in installing telephone terminal cabinet
Consider warning of installing telephone terminal cabinet Rate your performance based on the assessment criteria. If you do not pass the criteria go back to the operation sheet of installing telephone terminal cabinet
3. Answer self check #1 to test your knowledge on installing telephone terminal cabinet.
4. Read/ perform operation sheet about the installation of telephone terminals cabinet and frame
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INFORMATION SHEET 1.1 Provisions of Installing Telephone Terminal Cabinet Cabinet, according to Philippine Electrical code must have doors and are thus distinguished from large boxes with covers consisting of plates attached with screws and bolts. The Philippine Electrical code requires that all boxes used to enclose operating apparatus, i.e., Apparatus having moving parts or requiring inspection or attention Telephone Terminal Wall Cabinet Specifications 1. Generally inside terminal room are preferred. This allows for access to power for telephone equipment. With engineering approval wall Cabinets are acceptable for buildings less than 20,000 square feet with external mounted SRP power cabinets. If power is provided in an inside terminal room Saddleback will collocate with them. 2. Sun West Engineering, Inc. MPOP-09604808 cabinet is the only one approved by Saddleback Communications engineering. Other cabinets may be used but must be approved prior to installation. 3. An area 8’ in front of the cabinet must be kept clear for technician access. 4. One isolated 20 Amp breaker circuit is extended to plywood backboard inside the cabinet is to be provided. 5. One #6 insulated copper wire terminated at the main power service panel ground bus bar at one end and the other end terminated on a suitable buss bar located on the left side of the cabinet near the splice compartment is to be provided. 6. All access handles to accommodate a padlock. 7. Two 4” conduits equipped with calibrated mule tape are provided for Saddleback Communications facilities. Both enter on the left side of the cabinet. Point off feed locations will be provided by Saddleback Engineering. 8. A maximum on four three foot radius 90 degree bends are allowed in each pulling section.
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Pictorial diagram of telephone system Specification of materials, tools and equipment needed for the installation of telephone terminal cabinet: 1. Claw Hammer: Size: Head Weight: 10 02 Materials: Head: Steel Shaft: Fiber Glass Use: performing related electrical work 2. Linesman’s Pliers: Size 5 to 10 inches Material: Steel Use: to grip and bend crop wire 3. Long nose Pliers: Size 4 to 7 inches Use: to hold materials in narrow space 4. Level Bar: Size: 22 inches, materials: aluminum Uses: To check horizontal & vertical alignment 5. Try Square: Size: Blade 6 to 12 inches stock 4 to 8 inches Material: Blade Steel Use: to Mark out or check the work for squareness 6. Pull Push Steel Tape: Size 3 to 16 feet Material: Tape, steel
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Use: to determine the size of the work piece. 7. Screw Driver: Size 3 to 10 inches Materials: Handle plastic Use: to drive screw on electrical work 8. Chalk Line Reel: Size 18 to 100 feet Material: Cotton, Plastic Use: to snap a marked line 9. Plumb Bob: Size: Weight 4lbs. Material: Brass Use: to determine vertical line 10. Cross Cut Saw: Size: 60 cm Material: Hard Steel Use: to out wood across the grain 11. Cold Chisel: Size: Length 5 to 8 inches Material: Steel Use: to cut metal & concrete 12.
Telephone Terminal Cabinet Use: to enclosed Telephone system
13.
Frames: used to hold telephone system and terminals in place inside the cabinet.
14.
Fitting: used to properly connect conductor pipe lines
15.
Adhesive solvent: use to fix fitting and pipes to prevent moisture and ensure closed contact.
16.
Utility Box: used to enclosed wires on outlets.
17.
Junction Box: Location for wire joints and splices.
18.
Fastening Devices: used to hold frames, system and cabinet in place.
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Laying Out Telephone Cabinet Outline
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ASSESSMENT (SELF-CHECK) 1.1 LO 1: Layout and install telephone terminal cabinet and frames. A. Direction: On your answer sheet, write the letter of the correct answer that describes each item.
1.
It is used to mark out or check the work for squareness. a. Level Bar b. Try Square
2.
It is a tool used to check the horizontal and vertical alignment. a. Screw Driver b. Try Square
3.
c. Plumb Bob d. Chalk Line Reel
c. Level Bar d. Plumb Bob
It is used to enclosed telephone system and connections. a. Junction Box c. Utility Box b. Telephone Terminal Cabinet d. Fitting
4.
What do you call plastic made material used to hold convenient outlet on walls? a. Junction Box b. Utility Box
5.
c. Frames d. Fitting
It is used for splitting conductors and splices. a. Utility Box b. Junction Box
c. Fastening Device d. Adhesive
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OPERATION SHEET 1.1 LO 1: Layout and install telephone terminal cabinet Supplies and Materials
Telephone terminal cabinet Frames Fitting Adhesive solvent Utility box Junction box Fastening device - Bolts and nuts - Screw with tux
Tools
Lines Man’s Pliers Long Nose Pliers Diagonal Cutting Gimlet Level Bar Try Square Posh Tape Rule Claw Hammer Philip Screw Driver Flat Screw Driver Chalk line Reel Plumb Bob Cross Cut Saw Cold Chisel
Conditions The following resources are needed: 1. Observe proper use of PPE. 2. The workplace must be free from obstruction. 3. The installed telephone terminal cabinet should conform to the drawing plan details and standard. Procedure 1. Prepare the area for the installation of telephone terminal cabinet and
frames. 2. Ready all the necessary tools materials equipment.
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3. Follow the proper use of PPE for any protection, body protection, head
protection, hand and foot protection. 4. Ensures that mounting screws are installed in the upper and lower flanges
on the right and left side of the cabinet. 5. Check the vertical and horizontal alignment of the cabinet using testing tool. 6. Locate the power and ground terminations at the top front side of the cabinet
backplane. 7. Observe housekeeping activities.
Work Drawing
Installation of telephone terminal cabinet
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Assessment Criteria The activity will be evaluated based on the following assessment criteria. Measurement Points Mounting heights
15 pts
Distance from door windows
15 pts
Observe use of PPE
15 pts
Check horizontal and vertical alignment
20 pts
Grounding termination
10 pts
Proper use of tools
15 pts
Housekeeping
10 pts
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Program/Course:
BUILDING WIRING INSTALLATION NC II
Unit of Competency:
PERFORM ROUGHING-IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM
Module Title:
Performing Roughing-In Activities for Communication and Distribution System
Learning Outcome 2: Lay out and install wire ways Assessment Criteria 1. Philippine Electrical Code (PEC) provisions in the use, application and installation of wire ways are strictly followed. 2. Tools/equipment needed for the installation is prepared in line with job requirements. 3. Wire ways are installed in line with job requirements. 4. Personal safety in installing wire ways is followed. 5. Workplace is cleaned and made safe upon completion of work according to established standard. Resources 1. Azares, Efren F. and Recana, Cirilo B. Practical Electricity III; Adriana Publishing: 1999. 2. Agpaoa, Feleciano. Interior and Exterior Wiring Troubleshooting; National Bookstore: 1991. 3. http://www.easy2source.com/www.yahoo.com
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LEARNING EXPERIENCES/ACTIVITIES Learning Outcome 2: Layout and Install Wire Ways Learning Activities
Special Instructions
1. Read the attached information sheet # 2.1 on provisions for metal wireway
Try to answer the self check without looking at the information sheet. If you miss some of the items go over this enabling objectives
2. Answer self check # 2 on provisions of installing wire ways.
Refer to answer key
3. Read the sheet no 2.1 on procedures of wireways diagram.
See layout in operation sheet no 2.1
4. Analyze the step by step procedure of installing wire ways.
Evaluate yourself if you have knowledge about procedures If you are not ready go over operation sheet 2.1 on installing wire way
5. Answer self check no 2.2.
Refer to answer key
6. Perform the procedure of installing wire way
Rate yourself based on the assessment criteria If you did not pass the criteria go over this enabling objectives again If you are ready you can now proceed to next activity
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INFORMATION SHEET 2.1 Wire ways are units of assembly of troughs used for housing and protecting electric wire and cable and in which conductors are laid in place after the wire way has been installed as a complete system. Provisions for Metal Wire Ways 1. No conductor larger than that for which the wire way is designed shall be installed in any wire way. 2. Shall not contain more than 30 current carrying conductors at any cross section. 3. Where insulated conductor are defected within the wire way of greater than 30 degrees. 4. Splices and top shall be permitted within a wire way provided. 5. Dead end of wire way shall be closed. 6. Extensions from wire ways shall be made with cord pendants. 7. Wire ways shall be marked so that their manufacturers name or trademark will be visible after installation. 8. Grounding shall be in accordance with the provision of Article 2.50 of PEC.
Provisions for Non Metallic Wire Ways Uses Permitted: 1. Only for exposed work, except as permitted. 2. Where subject to corrosive vapors. 3. In wet location where listed for the purpose. Uses Not Permitted 1. Where subject to physical damage. 2. In any hazardous location, except as permitted
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3. Where exposed to sunlight values listed and marked as suitable for the purpose. 4. Where subject to ambient temperature. 5. For conductors whose insulation temperature limitation would exceed those for which the non – metallic wire way is listed.
Other article for non metallic wire ways 1. No conductor larger than that which non metallic wire way is designed shall be installed. 2. Number of conductors shall not exceed 20 percent of the interior cross sectional area. 3. Splices and taps, shall not fill more than 75 percent of its cross sectional area. 4. Dead end of non metallic wire way shall be closed using listed fitting. 5. Extension shall be made with cord pendant. 6. All have limited smoke producing characteristics. Electrical Wireways Wire ways and cable troughs are designed to protect electrical wires from dust, dirt, water and oil. They are available in various styles, sizes and fittings for use for wide range of voltages. They are often used to house and protect power and communications cables for commercial, institutional, industrial and utility needs. these wire way systems consist of wire way and appropriate fittings to complete the installation per the electrical drawings. Electrical wire ways often furnished with polyester powder coat paints. They are available with factory installed dividers to separate power and low voltage wiring housed in the same wire way sections. the material thickness based on wire way dimensions according to requirements. The base and cover of wire ways are factory assembled and fitted with wing nuts and screws for positive latching. Some wire way bases are provided with electrical knockouts. They are available with spectrum dimensions like wide and deepness.
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Types of Wire Ways 1. Metal Wire Way – are sheet metal through with hinged or removable covers for housing and protecting electric wire and cable and in which conductors are laid in place after the wire way has been installed as a complete system.
Commercial Metal Wire ways
Installed Metal Wire ways 2. Non Metallic Wire Way – are flame retardant, non metallic through with removable covers for housing and protecting electric wire and cables in which conductors are laid in place after the wire way has been installed as a complete system.
Non Metallic Wire way
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Model Lay out of Wire Ways
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ASSESSMENT (SELF-CHECK) 2.1 LO 2: Layout and install wire ways Direction: Fill in the blank with a word or group of word that will make the statement complete. Write your answer on a separate answer sheet. 1. Number of conductors in non metallic wire way shall not exceed ________ percent of the interior cross sectional area. 2. ________ from wire ways shall be made with cord pendant. 3. Non metallic wires way are __________ through with removable cover for housing wires and cables. 4. Are metal through used for housing conductors and has been installed as a complete system is called __________. 5. __________ wire way is permitted where subject to corrosive vapors. 6. The ________ of installed wire way shall be enclosed. 7. Permitted provision in _______ wire way for exposed work. 8. Grounding of wire way shall be in accordance with article ____ of PEC. 9. ______ of wire way are visible after installation. 10. Number of conductors for non metallic wire way shall not exceed ______ percent of interior cross sectional area.
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OPERATION SHEET 2.1 LO 2: Layout and Install Wire Ways
Supplies and Materials
Wire ways/C – furling Flat bar/brackets Fastening device for wood, concrete and steel
Tools
Linesman’s Pliers Diagonal Cutting Pliers Gimlet Level Bar Try Square Push Tape Rule Claw Hammer Set of Screw Drivers Chalk line Red Plumb Bob Cross Cut Saw Cold Chisel
Conditions 1. Proper selection of conditioned tools. 2. The place for work must be hazard free. 3. The installed wire ways should appear as per drawing or layout shown.
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Procedures 1. Prepare the area for the layout and installation of wire ways. 2. Prepare all the necessary tools, materials and supplies. 3. Wear the appropriate PPE. 4. Layout wire ways in horizontal and vertical direction. 5. Measure the location of support for screw. 6. Install wire way and locate support prior to job requirements. 7. Observe good housekeeping. Evaluation: The activity will be evaluated based on the following: Assessment Criteria The students will be evaluated based on the following:
Measurement Horizontal support 1500mm interval Vertical support 4500 mm interval Workmanship: Including cutting, horizontal alignment, vertical alignment, marking Cutting - Straight - Exact measurement Horizontal laying Vertical Laying Marking the trademark Total
Points 15 pts 15 pts 20 pts 20 pts 10 pts 10 pts 10 pts 100 pts
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Program/Course:
BUILDING WIRING INSTALLATION NC II
Unit of Competency:
PERFORM ROUGHING-IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM
Module Title:
Performing Roughing-in Activities for Communication and Distribution System
Learning Outcome 3: Lay out and install cable tray/cable bridge Assessment Criteria 1. Philippine Electrical Code (PEC) provisions in cable tray/cable bridge is strictly followed. 2. Tools/equipments needed for the installation are prepared in line with job requirements. 3. Cable tray/cable bridge is installed in line with job requirements. 4. Personal safety in installing cable tray/cable bridge is followed according to established standards. 5. Final report is prepared upon completion of job. Resources 1. Azares, Efren F. and Recana, Cirilo B. Practical Electricity III; Adriana Publishing: 1999. 2. Agpaoa, Feleciano. Interior and Exterior Wiring Troubleshooting; National Bookstore: 1991. 3. www.google.com 4. www.yahoo.com
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LEARNING EXPERIENCES/ACTIVITIES Learning Outcome 3: Layout and Install Cable Tray Learning Activities
1. Read the attached information sheet # 3.1 2. Answer self check #3.1 to test your knowledge on types of cable tray and fitting. 3. Compare your answer to answer key.
Special Instructions
Answer the self check without looking at the information sheet. You can ask your instructor or any of the advanced trainees to help you in checking your work.
4. If you miss some of the items go over this enabling objective again. 5. Perform the operation sheet number 3.
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INFORMATION SHEET 3.1 What is Cable tray? A cable tray is “a unit or assembly of units of sections and associated fittings forming a rigid structural system used to securely fasten or support cables and race ways”. Cable trays are used to hold up and distribute cables. A. Uses of Cable Tray Conductors support method somewhat like race way, under prescribed conditions.
Cable trays support cable the way that roadway bridges support traffic. A bridge is a structure that provides safe passage for traffic across open spans. Cable tray is the bridge that allows for safe transport of wires across open spans. Therefore, think of cable tray as the structural component of a building's electrical system.
B. Types of Cable Tray 1. Through type (or expanded metal – type) Tray – provides a sturdy, flexible system for supporting feeder cables particularly where routing of the runs is devious or where provision for change or modification in circuiting is important.
Typical Model of Trough Cable Tray
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2. Ladder – type tray – are used for supporting interlocked – armor cable feeder in many installation.
Ladder Type Tray 3. Solid Bottom – Typically used in application that generates moderate heat.
Solid Bottom Cable Tray 4. Channel – Features a one piece ventilated or solid bottom. Used for installations featuring small amounts of cable supported on short to medium spans.
Channel Cable Tray 5. Single rail aluminum – for light duty application where quick installation is desired.
Single Rail Cable Tray
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6. Wire mesh – for low voltage, telecommunication, and fiber optic cables supported on short span.
Wire Mesh Cable Tray C. Types of Cable Tray Fittings Cable tray advantages include wiring system design flexibility, simplicity, and lower installation cost. In plants where equipment is added, taken away, or is moved, cable trays provide a flexible advantage. Cable trays can typically adapt to complex configurations with a simple set of tools. The cost of material procurement for cable tray systems is not necessarily lower than that of conduit systems in all cases. However, compared to labor cost of conduit installation, cable trays present significant savings. There are five basic cable tray types: 1. Straight is used to tap two end of cable tray to extend its length.
2. L Junction is a cable tray fitting which is commonly used when the junction is made at the corner or to make right angle turn.
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3. T Junction is a type of fitting which is used to adopt cable tray in straight and tee joining
4. 4 – way Junction is a type of fitting
5. Reducer is a type of fitting which is used to adopt cable tray when it change in size.
Cable Tray Materials Metallic cable trays are readily available in aluminum, pregalvanized steel, hotdip galvanized after fabrication, and stainless steel. Aluminum cable tray should be used for most installations unless specific corrosion problems prohibit its use. Aluminum's light weight significantly reduces the cost of installation when Compared to steel
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Cable Tray Materials
Installation of cable tray
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ASSESSMENT (SELF-CHECK) 3.1 LO 3: Layout and install cable tray/cable bridge A. Direction: On your answer sheet, write the letter of the correct answer before each number. 1. It is used in application with intermediate to long support span. a. Solid Bottom b. Channel
c. Ladder d. Wire Mesh
2. It features a one piece or solid bottom. It is used for installation featuring small amounts of cable supported on short to medium span. a. Wire Mesh b. Ladder
c. Trough d. Channel
3. It is used for light – duty application where quick installation is desired. a. Single Rail b. Wire Mesh
c. Channel d. Solid Bottom
4. Generally used for low voltage, telecommunication and fiber optic application. a. Wire Mesh b. Ladder
c. Channel d. Trough
5. It is the fitting used when tray split in three separate directions? a. L – Junction b. Drop
c. 4 way Junction d. T - Junction
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OPERATION SHEET 3.1 LO 3: Layout and Install Cable Tray Tools
Linesman’s Pliers Long nose Pliers Diagonal cutting Pliers Gimlet Level Bar Try Square Push Tape Rule Claw Hammer Set of Screw Driver Chalk line Reel Plumb Bob Cross Cut Saw Cold Chisel Cable Tray Cable Bridge Flat Bar/Brackets Fastening device for wood, concrete and steel Ladder
Conditions 1. The equipment tools must be properly checked. 2. The workplace must be free from obstruction. 3. The installed cable tray should appear as per the drawing or picture shown.
Procedures 1. Prepare the area for the installation of cable tray. 2. Prepare all the equipment tools and materials. 3. Assemble the cable tray as per company standard. 4. Follow personal safety in installing cable tray according to established standard. 5. Strictly get in touch with layout in installing cable tray.
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Assessment Criteria Criteria Workmanship Measurement Use of trial Use of PPE Speed Housekeeping Total
Points 5 4 3 3 3 2 20
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ASSESSMENT PLAN Evidence Checklist Competency standard: Unit of competency:
Written
Portfolio
Demonstration
The evidence must show that the candidate …
Questioning
Observation
Ways in which evidence will be collected: [tick the column]
Third party Report
Title of Module
Get from assessment criteria of the module (CBC)
NOTE: *Critical aspects of competency Prepared by:
Date:
Checked by:
Date:
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Observation Checklist Student’s name: Teacher’s name: School Competency standards Unit of competency: Instructions for the teacher: 1. Observe the student [insert description of activity being observed]. 2. Describe the assessment activity and the date on which it was undertaken. 3. Place a tick in the box to show that the student completed each aspect of the activity to the standard expected in the enterprise. 4. Complete the feedback sections of the form. Date of observation Description of assessment activity Location of assessment activity The student….
If yes, tick the box
can
Did the student’s overall performance meet the standard?
Yes
No
Feedback to student: Teacher signature:
Date:
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Observation and Questioning Checklist Stuednt’s name: Teacher’s name: School Competency standards Unit of competency: Instructions for the assessor: 1. Observe the student [insert description of activity being observed]. 2. Describe the assessment activity and the date on which it was undertaken. 3. Place a tick in the box to show that the student completed each aspect of the activity to the standard expected in the enterprise. 4. Ask the student a selection of the questions from the attached list to confirm his/her underpinning knowledge 5. Place a tick in the box to show that the student answered the questions correctly. 6. Complete the feedback sections of the form. Date of observation Description of assessment activity Location of assessment activity The candidate…. can
If yes, tick the box
Did the student’s overall performance meet the standard?
Yes
No
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Demonstration Student’s name: Teacher’s name: Unit of competency: Competency standards: Date of assessment: Time of assessment: Instructions for demonstration Given the necessary materials the student must be able to:
Materials and equipment:
to show if evidence is demonstrated
During the demonstration of skills, did the candidate:
Yes
No
N/A
The student’s demonstration was: Satisfactory
Not Satisfactory
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Written report Student’s name: Teacher’s name: School Competency standards Unit of competency: Task: Your task is to: [insert description of task] Submission date: Use the checklist below as a basis for judging whether the student’s report meets the required competency standards. The student’s report….
can solve quantities needed through percentage
can tabulate data correctly
can convert temperature to the required temperature scale
can fill in appropriate form completely and correctly
can identify proper method of sealing packed products
can label correctly packed products
Overall did the student’s report meet the standard?
If yes, tick the box
Yes
No
Comments:
Student’s signature:
Date:
Teacher’s signature:
Date:
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PERFORMANCE TEST Student's Name
Date
Competency:
Directions: CALL TEACHER, ask teacher to assess your performance in the following critical task and performance criteria below You will be rated based on the overall evaluation on the right side.
Test Attempt 1st 2nd 3rd OVERALL EVALUATION Level Achieved
PERFORMANCE LEVELS
4 - Can perform this skill without supervision and with initiative and adaptability to problem situations. 3 - Can perform this skill satisfactorily without assistance or supervision. 2 - Can perform this skill satisfactorily but requires some assistance and/or supervision. 1 - Can perform parts of this skill satisfactorily, but requires considerable assistance and/or supervision. Teacher will initial level achieved.
PERFORMANCE STANDARDS For acceptable achievement, all items should receive a "Yes" or "N/A" response.
Yes
No
N/A
Get from Performance criteria of the module (TR)
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Answer key for self check # 1.1 1. 2. 3. 4. 5.
B C B A B
Answer key for self check #2.1 1. 30 current carry conductor 2. extensions 3. flame retardant 4. wire ways 5. non metallic 6. dead end 7. metallic and non metallic 8. article 2.50 of PEC 9. trademark 10. 20 percent
Answer key for self check #3.1 1. 2. 3. 4. 5.
C D. A A C
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Republic of the Philippines
Department of Education PUBLIC TECHNICAL-VOCATIONAL HIGH SCHOOLS
mhar
cueto
Unit of Competency: PERFORM ROUGHING-IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING ELECTRICAL METALLIC CONDUIT
Module No.:
2
Module Title: ROUGHING-IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING ELECTRICAL METALLIC CONDUIT
ACKNOWLEDGMENT Copyright Department of Education 2008 First Published JUNE 2008 This draft was prepared during the Competency-Based Learning Materials Development Workshop conducted at the Marikina Hotel, Marikina City on February 18-22, 2008 and finalized on May 23-25, 2008 at the Development Academy of the Philippines (DAP), Tagaytay City. This learning instrument was developed by the following personnel: Technology Teacher: Mr. Rodrigo S. Castillo Bauan Technical High School Bauan, Batangas Contextual Teacher: Ms. Gina C. delos Santos A.F.G. Bernardino Memorial Trade School Lias, Marilao, Bulacan Facilitators: Dr. Corazon C. Echano Project Coordinator DepED - TechVoc Task Force Encoder: Mr. Lemuel C. Valles Administrative Officer II Educational Information Division Fund: Department of Education REFERENCES AND FURTHER READING 1. Azares, Efren F. and Recana, Cirilo B. Practical Electricity III; Adriana Publishing: 1999. 2. Agpaoa, Feleciano. Interior and Exterior Wiring Troubleshooting; National Bookstore: 1991. 3. Richter, Herbert P. and Schwan, Creighton W. Practical Electrical Wiring: 16th Edition. 4. Fajardo, Max P. and Fajardo, Leo B. Electrical Layout and Estimates. 5. Balana, Ulysses B. Electricity III: BEC Based.
TABLE OF CONTENTS Page How to Use this Module ................................................................................... i Introduction .................................................................................................... ii Technical Terms ............................................................................................. iii Learning Outcome 1: Layout and install electrical metallic tubing Learning Experiences/Activities ............................................................. 2 Information Sheet 1.1 ............................................................................ 3 Self-Check 1.1 ....................................................................................... 6 Operation Sheet 1.1 ............................................................................... 7 Operation Sheet 1.2 ............................................................................... 8 Operation Sheet 1.3 ............................................................................. 10 Job Sheet 1.1 ...................................................................................... 12 Learning Outcome 2: Layout and install rigid metallic tubing Learning Experiences/Activities ........................................................... 19 Information Sheet 2.1 .......................................................................... 20 Self-Check 2.1 ..................................................................................... 24 Operation Sheet 2.1 ............................................................................. 25 Job Sheet 2.1 ...................................................................................... 26 Learning Outcome 3: Layout and install flexible metallic tubing Learning Experiences/Activities ........................................................... 30 Information Sheet 3.1 .......................................................................... 31 Self-Check 3.1 ..................................................................................... 33 Operation Sheet 3.1 ............................................................................. 34 Job Sheet 3.1 ...................................................................................... 35 Learning Outcome 4: Layout and install intermediate metallic tubing Learning Experiences/Activities ........................................................... 39 Information Sheet 4.1 .......................................................................... 40 Self-Check 4.1 ..................................................................................... 47 Job Sheet 4.1 ...................................................................................... 48 Assessment Plan ........................................................................................... 51 Observation Checklist ................................................................................... 53 Observation and Questioning Checklist ......................................................... 54 Demonstration .............................................................................................. 55 Written Report .............................................................................................. 56 Performance Test .......................................................................................... 57 Answer Key 1.1 ............................................................................................. 58 Answer Key 2.1 ............................................................................................. 59 Answer Key 3.1 ............................................................................................. 60 Answer Key 4.1 ............................................................................................. 61
HOW TO USE THIS MODULE Welcome to the Module “Roughing-in Activities for Communication and Distribution System Using Electrical Metallic Conduit”. This module contains training materials and activities for you to complete. The unit of competency “Perform Roughing-in Activities for Communication and Distribution System Using Electrical Metallic Conduit” contains the knowledge, skills and attitudes required for Building Wiring Installation course required to obtain the National Certificate (NC) level II. You are required to go through a series of learning activities in order to complete each of the learning outcomes of the module. In each learning outcome there are Information Sheets, Job Sheets, Operation Sheets and Activity Sheets. Do these activities on your own and answer the Self-Check at the end of each learning activity. If you have questions, don’t hesitate to ask your teacher for assistance. Recognition of Prior Learning (RPL) You may already have some basic knowledge and skills covered in this module. If you can demonstrate competence to your teacher in a particular skill, talk to your teacher so you don’t have to undergo the same training again. If you have a qualification or Certificate of Competency from previous trainings, show it to him/her. If the skills you acquired are consistent with and relevant to this module, they become part of the evidence. You can present these for recognition of prior learning. If you are not sure about your competence / skills, discuss this with your teacher. After completing this module, ask your teacher to assess your competence. Result of your assessment will be recorded in your competency profile. All the learning activities are designed for you to complete at your own pace. In this module, you will find the activities for you to complete and relevant information sheets for each learning outcome. Each learning outcome may have more than one learning activity. This module is prepared to help you achieve the required competency, in receiving and relaying information. This will be the source of information that will enable you to acquire the knowledge and skills in Building Wiring Installation NC II independently at your own pace with minimum supervision from your teacher.
PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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Program/Course:
BUILDING WIRING INSTALLATION NC II
Unit of Competency:
PERFORM ROUGHING-IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
Module Title:
Performing Roughing-in Activities for Communication and Distribution System Using Metallic Conduit
INTRODUCTION: This module contains information and suggested learning activities on installation of rigid metallic conduit. It includes instruction and procedure on how to install Electrical Metallic Tubing (EMT), Rigid Metal Conduit (RMC), Flexible Metallic Tubing (FMT), and Intermediate Metallic Tubing (IMT). Completion of this module will help you understand the succeeding module on installing communication device and remote control system. This module consists of four (4) learning outcomes. Each learning outcome contains learning activities with instruction sheets. Before you follow the instruction, read the information sheets and answer the self-check and activities provided to assess your competence by your teacher. He/she will check if you have acquired the knowledge necessary to perform the skill portion of the particular learning outcome. Upon completion of this module, report to your teacher for assessment. If you pass the assessment, you will be given a certificate of completion. SUMMARY OF LEARNING OUTCOMES Upon completion of the module the students shall be able to: LO1 Layout and install electrical metallic tubing LO2 Layout and install rigid metal conduit LO3 Layout and install flexible metallic tubing LO4 Layout and install intermediate metallic tubing ASSESSMENT CRITERIA Refer to assessment criteria of learning outcomes 1-4 of this module. PREREQUISITES Basic and Common Competencies
PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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TECHNICAL TERMS Circuit refers to tubing, piping or electrical wire installation, which permits flow to and from energy source. Circuit breaker is a safety device, which automatically open an electrical circuit if overloaded. Conduit is a pipe or raceway which serves as passage of electrical conductors. Dies and dies stock is a tool used to thread a conduit. EMT refers to Electrical Metallic Tubing. Elbow is a 90 degree angle bend fitting commonly used to make quarter bend. FMT refers to Flexible Metallic Tubing . Galvanic reaction is a reaction between two dissimilar metals. Hazardous location is a location in which flammable quantity is likely to occur. Hickey is a tool used to bend a conduit. IMC refers to Intermediate Metallic Conduit. Offset is a bend used to adopt the conduit from the surface to a particular boxes or fittings. OHSS refers to Occupational Health and Safety Standard. PEC refers to the Philippine Electrical code. PPE refers to Personal Protective Equipment. Quarter bend is a 90 degree angle bend. Reaming refers to removal of sharp edges at the end of the pipe. RMC refers to Rigid Metallic Conduit. Straps are electrical wiring supports which are used to hold pipe or raceway.
PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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Program/Course:
BUILDING WIRING INSTALLATION NC II
Unit of Competency:
PERFORM ROUGHING-IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
Module Title:
Performing Roughing-in Activities for Communication and Distribution System Using Metallic Conduit
Learning Outcome 1: Layout and install electrical metallic tubing Assessment Criteria 1. PEC provisions in installing EMT are strictly followed. 2. Tools/equipment and materials needed for the installation are prepared in line with job requirements. 3. Electrical metallic tubing bends are freed from any defects according to job requirements and specifications and OHS. 4. Electrical metallic tubing is installed according to job requirements and specifications and OHS. 5. Personal Safety in installing EMT is followed. 6. Workplace is cleaned and made safe upon completion of work according to established standard. 7. Final report is prepared upon completion of job. References: 1. Azares, Efren F. and Recana, Cirilo B. Practical Electricity III; Adriana Publishing: 1999. 2. Agpaoa, Feleciano. Interior and Exterior Wiring Troubleshooting; National Bookstore: 1991. 3. Richter, Herbert P. and Schwan, Creighton W. Practical Electrical Wiring: 16th Edition. 4. Fajardo, Max P. and Fajardo, Leo B. Electrical Layout and Estimates. 5. Balana, Ulysses B. Electricity III: BEC Based.
LO 1. LAYOUT AND INSTALL ELECTRICAL METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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LEARNING EXPERIENCES/ACTIVITIES Learning Outcome 1: Layout and install electrical metallic tubing (EMT) Learning Activities
Special Instructions
1. Read Information Sheet 1.1 about the PEC provision on the Installation of Electrical Metallic Tubing. 2. Do the Self-Check
Do not write anything on the module.
Prepare an extra sheet of paper for your answer sheet on the SelfCheck and other practice materials / sheets (e.g. Operation Sheets, Activity Sheets and Job Sheets).
3. Read Operation Sheets 1.1,1.2,1.3 about Cutting and Bending Electrical Metallic Tubing 4. Perform Operation Sheets about: Cutting EMT Bending EMT
Ask your teacher to demonstrate the steps on how to cut and bend Electrical metallic Tubing
5. Perform Job Sheet 1.1 about the installation of Electrical Metallic Tubing.
Follow the drawing plan on the installation of Electrical metallic Tubing should follow a measurement of +-3mm tolerance from center to center. Wear PPE in doing the job.
LO 1. LAYOUT AND INSTALL ELECTRICAL METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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INFORMATION SHEET 1.1 PEC PROVISION ON ELECTRICAL METALLIC TUBING INTRODUCTION A rigid metal conduit is a type of wiring installation which is designed to lessen or eliminate fire hazard and electrical accident. The following rules and regulations on the use of electrical metallic tubing should be observed: A. Application Electrical metallic tubing may be used for exposed and concealed work at the same condition with rigid metal conduit. EMT protected with enamel should not be used on the following conditions: a. b. c. d.
subjected to mechanical during or after the construction Cinder fill hazardous location exposure to corrosive fumes and vapor
B. Sizes Electrical metallic tubing has smooth surface inside diameter. Its standard length follows the gas pipe which is 10 ft. and a diameter from ½ inch, ¾ inch up to 6 inches. C. Location of some corrosive fumes and vapor a. meat packing plant b. tanneries c. salt storage plant D. Under wet location Electrical metallic tubing can be used provided the water is prevented in entering the conduit. The support, straps and other fitting must be approved for the purpose. E. Number of conductors in tubing The number of conductor for every single run of EMT should follow the given table on the next page:
LO 1. LAYOUT AND INSTALL ELECTRICAL METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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Trade size of conduit in inches 3/8” 1/2" 3/4" 1” 1 ½”
Size in AWG 16 14 12 6 2
No. of conductors 8 8 10 12 12
(Reference: Interior and Exterior Wiring and Troubleshooting, pp. 135-136 by Feliciano Agpaoa)
F. Assembly Thread less coupling and connectors used with tubing should be tight and should be provided with waterproof type fitting if will be used in wet location. G. Types of EMT fitting (Reference: Interior and Exterior Wiring, pp. 137-138 by Feliciano Agpaoa)
Connector
Coupling
Adapter
Locknut
Elbow
Condulets
H. Type of EMT utility boxes and fitting
Utility Box
Octagonal Box
Clamps/Straps
I. Number of bends of EMT The code requires a maximum of four adapter bends (360) for every one run of tubing. LO 1. LAYOUT AND INSTALL ELECTRICAL METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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J. Types of bends The following illustrations show the different kinds of bends used in the installation of electrical metallic tubing.
Obstacle
Elbow bend 90
Offset bend
Saddle bend
K. Personal Protective Equipment (PPE)
Goggles
Helmet
Gloves
LO 1. LAYOUT AND INSTALL ELECTRICAL METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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SELF-CHECK 1.1 A. Direction: On your answer sheet, write the letter of your answer. 1. It is the type of metal conduit which is designed to lessen or eliminate fire hazard. A. EMT B. RSC C. PVC D. BX 2. It is the allowable number of quarter bends which can be done in a one run of electrical metallic conduit. A. 2 B.3 C. 4 D. 6 3. It is a type of fitting which is used to secure EMT to metallic boxes. A. connector B. condulets C. adaptor D. coupling 4. It is the size of conduit which can accommodate a maximum of 10 wires AWG # 12. A. 3/8 B. 1/2 C. 3/4 D. 1 ¼ 5. It is the type of bend which make one quarter turn is a ______. A. offset B. elbow C. saddle D. goose neck
B. Direction: Name the following conduit fittings.
6.
7.
8.
9.
10.
LO 1. LAYOUT AND INSTALL ELECTRICAL METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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OPERATION SHEET 1.1 CUTTING ELECTRICAL METALLIC TUBING Supplies and Materials
Pencil Chalk EMT pipe
Tools and Equipment
Metric rule Try square Bench vise Hack saw / pipe cutter Personal protective equipment - gloves and goggles
Procedure 1. Prepare the necessary tools, materials and personal protective equipment
(PPE). 2. Wear the appropriate PPE. 3. Mark the length of EMT to be cut using the metric rules. 4. Cut the EMF using the hacksaw or pipe cutter. Note: The action of the hacksaw is performed in forward stroke. The teeth of the hack saw must be towards the handle.
5. Observe good housekeeping.
Assessment Criteria CRITERIA Workmanship Measurement Use of tool Use of PPE Speed Housekeeping TOTAL
POINTS 5 4 3 3 3 2 20
LO 1. LAYOUT AND INSTALL ELECTRICAL METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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OPERATION SHEET 1.2 BEND METALLIC TUBING (ELBOW BEND) Supplies and Materials
Pencil Chalk EMT pipe
Tools and Equipment
Hickey with handle Hacksaw Metric rule Try square Personal protective equipment - gloves - goggles - safety shoes
Procedure 1. Prepare the necessary tools, materials and equipment. 2. Wear the appropriate PPE. 3. Draw right angle bend on the floor using the try square.
4. Draw an arc near the corner.
5. Mark off the center of the location of the bend.
LO 1. LAYOUT AND INSTALL ELECTRICAL METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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6. Insert the EMT into the conduit bender / hickey where the center of the bend
is to be made. 7. Bend the EMT gradually to form a 90 bend. Check the desired shape by
placing the conduit on the layout which can be seen on step 3.
8. Remove the bender on the right angle bent EMT. 9. Observe good housekeeping.
Assessment Criteria CRITERIA Accuracy of bend Measurement Use of tool Use of PPE Speed Housekeeping TOTAL
POINTS 5 4 3 3 3 2 20
LO 1. LAYOUT AND INSTALL ELECTRICAL METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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OPERATION SHEET 1.3 BEND METALLIC TUBING (OFFSET BEND) Supplies and Materials
Pencil Chalk EMT pipe
Tools and Equipment
Hack saw Metric rule Try square Hickey /conduit bender Personal protective equipment - gloves - goggles
Procedure 1. Prepare the necessary tools, materials and equipment.
2. Wear the appropriate PPE. 3. Measure the elevation of the box where the bend is to be fitted.
4. Draw the depth of the elevation on the floor. This will make two lines.
5. Mark off 100mm from the end of the pipe.
LO 1. LAYOUT AND INSTALL ELECTRICAL METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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6. Put another 200mm from your first marker.
7. Insert the hickey on the second marker and bend gradual backward stroke to
follow its depth. 8. Move the hickey on the first marker and bend gradual
forward stroke to follow its height.
9. Remove the hickey 10. Observe good housekeeping.
Assessment Criteria CRITERIA Accuracy of bend Measurement Use of tool Use of PPE Speed Housekeeping TOTAL
POINTS 5 4 3 3 3 2 20
LO 1. LAYOUT AND INSTALL ELECTRICAL METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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JOB SHEET 1.1 INSTALL ELECTRICAL METALLIC TUBING Supplies and Materials
Serving cap Panel box Utility box Octagonal box Panel box Flush receptacle Incandescent bulb Connector (EMT) Metal strap
Tools and Equipment
Wiring booth Metric rule Try square Bench vise Hack saw / pipe cutter Level Plumb bob Chalk line Screw driver Hammer Personal protective equipment - gloves - goggles - hard hat - tight clothes
LO 1. LAYOUT AND INSTALL ELECTRICAL METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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Plan / Working Drawing
CB
1
2
Procedure 1.
Prepare the necessary tools, materials and equipment.
2.
Read / interpret the working drawing.
3.
Wear appropriate PPE.
4.
Remove knockout on metallic boxes where conduit will enter boxes.
5.
Layout and measure the position of all electrical boxes based on the given working drawing.
6.
Install boxes.
7.
Cut conduit to desired length.
8.
Ream conduit ends.
9.
Make the necessary bend of the conduit.
10. Secure conduit to boxes using connector and locknuts 11. Check the horizontality and verticality of the mounted boxes. 12. Observe good housekeeping.
LO 1. LAYOUT AND INSTALL ELECTRICAL METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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Assessment Criteria The students will be evaluated based on the following: MEASUREMENT All dimensions will be in mm center to center with a tolerance of + - 3mm. WORKMANSHIP Includes bending, cutting, supporting and installing electrical metallic tubing. Bending Cutting Supporting Horizontality and verticality SPEED SAFETY USE OF TOOLS TOTAL
LO 1. LAYOUT AND INSTALL ELECTRICAL METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
20 pts. 10 pts. 10 pts 10 pts. 10 pts. 10 pts. 10 pts. 10 pts. 10 pts. 100%
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Program/Course:
BUILDING WIRING INSTALLATION NC II
Unit of Competency:
PERFORM ROUGHING-IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
Module Title:
Performing Roughing-in Activities for Communication and Distribution System Using Metallic Conduit
Learning Outcome 2: Layout and install rigid metallic tubing Assessment Criteria 1. Uses and application of rigid steel conduit are strictly followed according to the Philippine Electrical Code Standards. 2. Tools/equipments and materials needed for the installation are prepared in line with job requirements. 3. Rigid metal conduit bends are free from any defects according to established standards. 4. Rigid metal conduit is installed according to job requirements and specifications. 5. RMC support is fabricated according to job requirements. 6. Personal safety in installing RMC is followed. 7. Workplace is cleaned and made safe upon completion of job according to established standard. 8. Final report is prepared upon completion of job. References: 1. Azares, Efren F. and Recana, Cirilo B. Practical Electricity III; Adriana Publishing: 1999. 2. Agpaoa, Feleciano. Interior and Exterior Wiring Troubleshooting; National Bookstore: 1991. 3. Richter, Herbert P. and Schwan, Creighton W. Practical Electrical Wiring: 16th Edition. 4. Fajardo, Max P. and Fajardo, Leo B. Electrical Layout and Estimates. 5. Balana, Ulysses B. Electricity III: BEC Based.
LO 2. LAYOUT AND INSTALL RIGID METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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LEARNING EXPERIENCES/ACTIVITIES Learning Outcome 2: Layout and install rigid metallic tubing (RMT) Learning Activities
Special Instructions
1. Read Information Sheet PEC of installing Rigid Metal conduit 2. Do the Self-Check
Do not write anything on the module.
Prepare an extra sheet of paper for your answer sheet on the SelfCheck and other practice materials / sheets (e.g. Operation Sheets, Activity Sheets and Job Sheets).
Ask your teacher to demonstrate the proper way of reaming the end of cut RMC
Observe safety procedures in installing Rigid Metal Conduit
3. Read Operation Sheet about Reaming Rigid Metal Conduit 4. Perform Operation Sheet 2.1 reaming conduit 5. Perform Operation Sheet 2.1 about the installation of Rigid Metal Conduit
6. Perform Job Sheet 1 about the installation of Rigid Metal Conduit
LO 2. LAYOUT AND INSTALL RIGID METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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INFORMATION SHEET 2.1 INSTALL RIGID METALLIC CONDUIT (RMC) INTRODUCTION A rigid metal conduit served the same purpose as with the Electrical Metallic Tubing. They are designed to protect the electrical wiring of building from electrical hazard due to faulty wiring. It is usually installed buried in concrete wall floor and ceiling, in masonry or similar materials. It is also used for exposed and concealed works, it provides maximum protection due to mechanical damage. In order that this wiring method will become effective, safe and reliable, it is a must that it should follow the PEC standard and specifications. PEC provisions The Philippine Electrical Code is a set of rules and regulations which govern all electrical wiring. The following standard and specifications must be followed in installing Rigid Metal Conduit: Standard size of RMC Rigid metal conduit has smooth inside diameter. Its standard length follows the gas pipe which is 10 feet and a diameter from ½, ¾ , up to 6 inches. Installation under atmospheric condition
Protected by Enamel- Conduit protected only with enamel are permitted only in indoor occupancies not subjected to severe corrosive influences. Dissimilar metal – Contacts of metal to another metal must be avoided in installing RMC to prevent the possibility of galvanic reaction. Corrosion protection – Conduits fitting with corrosion protection are permitted to be installed in concrete, direct earth burial or in areas subjected to corrosive influences.
Number of conductors inside the conduit The table on the next page shows the number of conductors permitted in a single conduit.
LO 2. LAYOUT AND INSTALL RIGID METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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Maximum number of conductors allowed in trade size conduit from ½ - 3 inches. Conduit trade size Conductor size TW, XHHW 14 12 10 8 RHW, 14 RHH,THW 12 10 8 TW,THW,RHW 6 RHH(without 4 covering 3 2 1
½
¾
1
1¼
1½
2
2½
3
9 7 5 2 6 4 4 1 1 1 1 1
15 12 9 4 10 8 6 3 2 1 1 1 1
25 19 15 7 16 13 11 5 4 3 2 2 1
44 35 26 12 29 24 19 10 7 5 4 4 3
60 47 36 17 40 32 26 13 10 7 5 5 4
99 78 60 28 65 53 42 22 16 12 10 9 6
142 111 85 40 93 76 61 32 23 17 15 13 9
171 131 62 143 117 95 49 36 27 23 20 14
Type letter
Fittings The following are type of conduit fittings which are usually used when wiring installation make sharp turns. The letter shows that an elbow or fitting makes right angle turn. They are:
LR
LB
LL
C
LO 2. LAYOUT AND INSTALL RIGID METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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Bends Rigid metal conduit can also be bent using hickey or conduit bender. It follows the same procedure bending electrical metallic tubing.
Bending RMC using hickey
Hickey
Cut Conduit is cut with hacksaw or pipe cutter. For easy and safe way of cutting, a bench vise is recommended so that pipe can be held firmly while it is being cut.
Cutting pipe using hacksaw
Pipe cutter
Ream After cutting the pipe with hacksaw or pipe cutter, it leaves burrs. This must be removed to avoid damage of wire insulation when it is inserted in it. A reamer or round file can be used to remove burrs.
LO 2. LAYOUT AND INSTALL RIGID METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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Threads Since rigid metal conduit is commonly used in places where there is wet location, sealing of termination can be best done if pipe is treaded. These will prevent water from entering the conduit. The use of dies and dies stock keep the end of the pipe threaded. The sizes of dies stock ranges from ½ to 6 inches.
Dies and dies stock
Tripod w\ pipe cutter
Die and dies stock set
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SELF-CHECK 2.1 Direction: On your answer sheet, write the letter of your answer. 1. It is a process of removing sharp edges or burrs left after cutting the
pipe. A. Reaming Installing
B. Cutting
C. Bending
D.
2. It is a type of condulet which makes conduit run turns to the right.
A. C
B.LL
C. LB
D. LR
3. It is the tool used to thread rigid metal conduit.
A. hickey cutter
B. dies and dies stock
C. reamer
D.
4. It is a type of condulet which has an opening at the back.
A. C
B.LL
C. LB
D. LR
C. 14 ft.
D. 20 ft.
5. It is the standard length of RMC.
A. 10 ft.
B. 12 ft.
Essay Why is it important to follow PEC provisions in the use and application of rigid metal conduit wiring?
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OPERATION SHEET 2.1 REAM CONDUIT Supplies and Materials
Pencil Chalk Rag FMT
Tools and Equipment
Bench vise Hack saw Personal protective equipment - gloves - goggles - hardhat
Procedure 1. Prepare the necessary tools, materials, equipment and PPE in performing the
activity. 2. Wear the appropriate PPE.
3. Measure and mark the location of cut. 4. Cut the conduit using hacksaw.
5. Ream the newly cut conduit using the flute reamer or file. 6. Put another 200mm from your first marker. 7. Check if the end of the pipe is smooth. 8. Have your teacher check your work.
LO 2. LAYOUT AND INSTALL RIGID METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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JOB SHEET 2.1 INSTALL RIGID METAL CONDUIT Supplies and Materials
Serving cap Panel box Utility box Octagonal box Panel box Flush receptacle Incandescent bulb Connector (RMC) Metal strap
Tools and Equipment
Wiring booth Wiring plan Serving cap Panel box Utility box Octagonal box Panel box Flush receptacle Incandescent bulb Connector (RMC) Metal strap Personal protective equipment - gloves - goggles - hard hat - tight clothes
LO 2. LAYOUT AND INSTALL RIGID METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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Plan / Working Drawing
CB
1
2
Procedure 1.
Prepare the necessary tools, materials and equipment.
2.
Read / interpret the working drawing.
3.
Wear appropriate PPE.
4.
Remove knockout on metallic boxes where conduit will enter boxes.
5.
Layout and measure the position of all electrical boxes based on the given working drawing.
6.
Install boxes.
7.
Cut conduit to desired length.
8.
Ream conduit ends.
9.
Install the RMC by following the given work drawing.
10. Secure conduit to boxes using connector and locknuts 11. Check the horizontality and verticality of the mounted boxes. 12. Perform good housekeeping. 13. Have your teacher check your work LO 2. LAYOUT AND INSTALL RIGID METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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Assessment Criteria The activity will be evaluated based on the following: MEASUREMENT All dimensions will be in mm center to center with a tolerance of + - 3mm. (in excess of 2mm from the prescribed tolerance = 0 point) WORKMANSHIP Includes bending, cutting, supporting and installing electrical metallic tubing. Bending Cutting Supporting Horizontality and verticality SPEED SAFETY Use appropriate PPE PROPER USE OF TOOLS AND CORRESPONDING SAFETY TOTAL
LO 2. LAYOUT AND INSTALL RIGID METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
20 pts. 15 pts. 10 pts 10 pts. 15 pts. 10 pts. 10 pts. 10 pts. 10 pts. 100%
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Program/Course:
BUILDING WIRING INSTALLATION NC II
Unit of Competency:
PERFORM ROUGHING-IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
Module Title:
Performing Roughing-in Activities for Communication and Distribution System Using Metallic Conduit
Learning Outcome 3: Layout and install flexible metallic tubing Assessment Criteria 1. PEC provisions in installing FMC are strictly followed. 2. Tools and equipment needed for the installation are prepared in line with job requirements. 3. Flexible metallic conduit is installed in line with the job requirements 4. Personal safety in installing FMC is observed. 5. Workplace is cleaned and made safe upon completion of work according to established standard. 6. Final report is prepared upon completion of job. References: 1. Azares, Efren F. and Recana, Cirilo B. Practical Electricity III; Adriana Publishing: 1999. 2. Agpaoa, Feleciano. Interior and Exterior Wiring Troubleshooting; National Bookstore: 1991. 3. Richter, Herbert P. and Schwan, Creighton W. Practical Electrical Wiring: 16th Edition. 4. Fajardo, Max P. and Fajardo, Leo B. Electrical Layout and Estimates. 5. Balana, Ulysses B. Electricity III: BEC Based.
LO 3. LAYOUT AND INSTALL FLEXIBLE METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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LEARNING EXPERIENCES/ACTIVITIES Learning Outcome 3: Layout and install flexible metallic tubing (FMT) Learning Activities
Special Instructions
1. Read Information Sheet PEC of installing Flexible metal conduit
Answer self check 3.1
2. Do the Self-Check
Do not write anything on the module.
Prepare an extra sheet of paper for your answer sheet on the SelfCheck and other practice materials / sheets (e.g. Operation Sheets, Activity Sheets and Job Sheets).
Follow the drawing plan and the procedures in installing the Flexible Metal Conduit
Observe safety all the time in installing Flexible Metal Conduit
3. Perform job sheet 3.1 about the installation of Flexible Metal Conduit
LO 3. LAYOUT AND INSTALL FLEXIBLE METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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INFORMATION SHEET 3.1 Install Flexible Metallic Tubing (FMT) INTRODUCTION Flexible metallic conduit is a kind of wiring installation which is commonly used for external motor terminal connection. It is being manufactured in rolled in the form of coil.
This type of wiring method should not be allowed under the following conditions:
In wet location In hoist way In storage battery room In hazardous location When exposed to oil, gasoline or materials which affects rubber
A flexible conduit is consists of flexible steel tube which are made from convex to concave metal strip in a spiral winding with length from 50 to 200 feet. Flexible metallic conduit should be supported with a distance of 136cm or closer. Every turns should be done carefully to avoid deformity. Straps or clamp can be used to secure the conduit. Flexible metallic conduit (FMT) is used in a connection where the load being supplied no definite place where flexibility is desired. Some common equipment are the portable motor, drill press lathe machine and the like. The minimum size of this type of conduit range from ½ to 1 ½ inches electrical trade size.
LO 3. LAYOUT AND INSTALL FLEXIBLE METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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Maximum number of conductors in a trade size conduit Trade size of conduit
Size in AWG
No. of Conductors
3/8 1/2 3/4 1 1½
16 12 8 6 2
8 8 10 12 12
Flexible metallic conduit fittings
Electrical boxes- boxes such as utility, square and octagonal are used for the installation of electrical wiring fixtures like switches, receptacles and for making electrical termination.
Square box
Octagonal box with fitting
Octagonal box
LO 3. LAYOUT AND INSTALL FLEXIBLE METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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SELF-CHECK 3.1 A. Direction: On your answer sheet, write the word or words being referred to by the statement of your answer. 1. It is the support used to hold the flexible metallic conduit. 2. It is the minimum length of conduit in a single roll. 3. It is the maximum number of conductors for a trade size
no. 12 AWG. in a ½ diameter size conduit. 4. FMT means ___________________________________. 5. It is the fitting used for joining flexible to metal conduit. 6. These are the locations where metallic conduits are not
allowed to use. B. Direction: Name the following Flexible Metallic Conduit materials.
7.
9.
8.
10.
LO 3. LAYOUT AND INSTALL FLEXIBLE METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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OPERATION SHEET 3.1 CUT FLEXIBLE METAL CONDUIT Supplies and Materials
Pencil Chalk Rag FMT
Tools and Equipment
Bench vise Hack saw Personal protective equipment - gloves - goggles - hardhat
Procedure 1. Prepare the necessary tools, materials, equipment and PPE in performing the
activity. 2. Wear the appropriate PPE.
3. Measure and mark the location of cut. 4. Cut the flexible conduit only on the single armor.
Be careful not to cut
conductors inside the FMT. 5. Twist off the armor then pull one end of the flexible conduit. 6. Remove the sharp end of the newly cut conduit using the file or reamer. 7. Have your teacher check your work.
LO 3. LAYOUT AND INSTALL FLEXIBLE METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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JOB SHEET 3.1 INSTALL FLEIBLE METAL CONDUIT (FMT) Supplies and Materials
Serving cap Panel box Utility box Octagonal box Panel box Flush receptacle Incandescent bulb Connector (FMT) Metal strap Wiring plan
Tools and Equipment
Wiring booth Metric rule Try square Bench vise Hack saw / pipe cutter Level Plumb bob Chalk line Screw driver Hammer Personal protective equipment - gloves - goggles - hardhat - tight clothes
LO 3. LAYOUT AND INSTALL FLEXIBLE METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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Plan / Working Drawing
1
1
CB
Procedure 1.
Prepare the necessary tools, materials and equipment.
2.
Read / interpret the working drawing.
3.
Wear appropriate PPE.
4.
Remove knockout on metallic boxes where conduit will enter boxes.
5.
Layout and measure the position of all electrical boxes based on the given working drawing.
6.
Install boxes.
7.
Cut conduit to desired length.
8.
Ream conduit ends.
9.
Install the FMT by following the given work drawing.
10. Secure conduit to boxes using connector and locknuts 11. Check the horizontality and verticality of the mounted boxes. LO 3. LAYOUT AND INSTALL FLEXIBLE METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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12. Perform good housekeeping. 13. Have your teacher check your work. Assessment Criteria The activity will be evaluated based on the following: MEASUREMENT All dimensions will be in mm center to center with a tolerance of + - 3mm. (in excess of 2mm from the prescribed tolerance = 0 point) WORKMANSHIP Includes bending, cutting, supporting and installing electrical metallic tubing. Bending Cutting Supporting Horizontality and verticality SPEED SAFETY Use appropriate PPE PROPER USE OF TOOLS AND CORRESPONDING SAFETY TOTAL
LO 3. LAYOUT AND INSTALL FLEXIBLE METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
20 pts. 15 pts. 10 pts 10 pts. 15 pts. 10 pts. 10 pts. 10 pts. 10 pts. 100%
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Program/Course:
BUILDING WIRING INSTALLATION NC II
Unit of Competency:
PERFORM ROUGHING-IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
Module Title:
Performing Roughing-in Activities for Communication and Distribution System Using Metallic Conduit
Learning Outcome 4: Layout and install intermediate metallic tubing Assessment Criteria 1. PEC provisions in installing IMC are strictly followed. 2. Tools, equipment and materials needed for the installation are prepared in line with job requirements. 3. Bending of intermediate metal conduit is performed in accordance with prescribed procedure and work requirement. 4. Intermediate metal conduit is installed according to job requirements and specifications and OHS. 5. Workplace is cleaned and made safe upon completion of work according to established standard. 6. Final report is prepared upon completion of job. Resources 1. Azares, Efren F. and Recana, Cirilo B. Practical Electricity III; Adriana Publishing: 1999. 2. Agpaoa, Feleciano. Interior and Exterior Wiring Troubleshooting; National Bookstore: 1991. 3. Richter, Herbert P. and Schwan, Creighton W. Practical Electrical Wiring: 16th Edition. 4. Fajardo, Max P. and Fajardo, Leo B. Electrical Layout and Estimates. 5. Balana, Ulysses B. Electricity III: BEC Based.
LO 4. LAYOUT AND INSTALL INTERMEDIATE METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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LEARNING EXPERIENCES/ACTIVITIES Learning Outcome 4: Layout and install intermediate metallic tubing (IMT) Learning Activities
Special Instructions
1. Read Information Sheet on PEC of installing Intermediate metallic conduit 2. Do the Self-Check
Do not write anything on the module.
Prepare an extra sheet of paper for your answer sheet on the SelfCheck and other practice materials / sheets (e.g. Operation Sheets, Activity Sheets and Job Sheets).
3. Read the Job Sheet 4-1 about the installation of Flexible metal conduit 4. Perform Job Sheet 4.1 about the installation of Intermediate Metallic Conduit
Follow the drawing plan and the procedures in installing the Flexible Metal Conduit Observe safety all the time in installing Intermediate Metallic Conduit Metal Conduit
LO 4. LAYOUT AND INSTALL INTERMEDIATE METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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INFORMATION SHEET 4.1 INSTALL INTERMEDIATE METALLIC TUBING (IMT) INTRODUCTION Conduit and Tubing How many of us have used the name conduit to describe all enclosures in which conductors and cables are run? Raceway is the accepted name for a metallic or non-metallic channel in which conductors and cables are run. Conduit is correctly used only for raceways with conduit in the name. These include flexible and rigid-metal conduit, rigid-nonmetallic conduit and liquidtight flexible conduit. Several types of raceways look similar to conduit, but use tubing in the name. These include flexible-metallic tubing, electrical nonmetallic tubing and electrical-metallic tubing. Installation and support requirements are different for conduit and tubing. If you are not sure what you are looking at, raceway is a good generic name.
Flexible Metal Conduit (FMC)
Liquid tight Flexible Conduit (LFC)
Intermediate Metal Conduit (IMC)
Electrical Metallic Tubing (EMT)
LO 4. LAYOUT AND INSTALL INTERMEDIATE METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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Intermediate metallic conduit (Ferrous metal) Intermediate metallic conduit is listed threaded raceway of circular cross section with coupling which can be either straight tapped conduit coupling. Intermediate metallic conduits are available in trade sizes ½ through 4 inches. Fittings Elbow - is bent section of the conduit or tubing used to change raceway direction or bypass obstruction.
Nipples - is a short length of conduit or tubing material which is used to extend a conduit system. Nipples are used between conduit or tubing and items such as boxes or enclosures between two boxes.
Coupling - Each length of IMC is furnished with coupling on one end, it permits joint
LO 4. LAYOUT AND INSTALL INTERMEDIATE METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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Electrical boxes- boxes such as utility, square and octagonal are used for the installation of electrical wiring fixtures like switches, receptacles and for making electrical termination.
Square box
octagonal box with fitting
Octagonal box
LO 4. LAYOUT AND INSTALL INTERMEDIATE METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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Conduit expansion fittings
Shorts and faults When a 120-volt residential electrical circuit is functioning as intended, electricity flows through the ungrounded (hot) conductor to the outlet, performs work in the attached equipment and returns through the grounded (neutral) conductor. Sometimes, because of improper wiring or damaged conductors, current flows directly between ungrounded conductors or between an ungrounded and grounded conductor. When this happens, a short circuit, or simply a short, occurs. One function of the over current-protection
LO 4. LAYOUT AND INSTALL INTERMEDIATE METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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device is to detect the short and open the circuit before additional damage or a fire occurs Sometimes, metal that is not supposed to be energized becomes energized. This usually occurs because of damaged equipment or conductors. Unintentionally energized metal could include the metal case of some equipment, a metal raceway or metal pipe. When current “leaks” from its intended path, a ground fault occurs. If people are part of the ground-fault current path, they can be electrocuted. A ground-fault circuit interrupter (GFCI) detects this leak as an imbalance of the current flow between the ungrounded and grounded conductors and opens the circuit. Concealed and Accessible Wiring within a building is accessible if one can reach it for inspection, maintenance or replacement without damaging the structure or its finishing materials. Access need not be easy and may require removing a panel, but so long as reasonable access is possible, the wiring is considered accessible. For example, most conductor splices and connections must be accessible in a covered box or conduit body (E3805.1). The box or conduit body may not be located behind drywall or other finish material. Conversely, a component is concealed if access to it requires damaging the structure or finish materials. NM cables behind finished walls or in a raceway are considered concealed. This cable may be run in attics or crawl spaces, with certain restrictions. One commonly ignored restriction occurs in attics equipped with permanent stairs or pull-down ladders. In these attics, if NM and UF cable is installed over attic flooring or on top of attic joists, or across the face of studs or rafters, then substantial guard strips at least as high as the cable must protect the cable. If attic access is by a scuttle hole, protection is required only within six feet of the nearest edge of the hole (E3702.2.1). Some electrical equipment, such as service equipment and panel board cabinets, must be readily accessible. Readily accessible equipment must be reached without removing or opening locks, moving obstacles or belongings, or using ladders (E3401 & E3305.4). During a fire or electrical emergency, quick access to such equipment can be a life or death issue. Damp and wet locations Electricity and water do not coexist well. Electrical equipment and wiring that might come in contact with water must be listed for such contact. A damp location is one where the equipment or wiring will not be saturated with water. Outdoor examples include under canopies and roof-covered porches. Indoor
LO 4. LAYOUT AND INSTALL INTERMEDIATE METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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locations include some basements, barns, storage sheds, detached garages, and most ceilings in showers and tub/showers. A wet location is one where the equipment or wiring could be saturated with water. This includes all uncovered outdoor locations and all underground locations. Also included is concrete and masonry in direct contact with the ground. Buried raceways are a wet location because water can accumulate there. Equipment listed for wet locations may be used in damp locations. Equipment listed for damp locations may be used in damp or dry locations, but not in wet locations. Wiring listed for wet locations has the letter W included in the conductor type and must be used in wet and damp locations. Specific Installation Requirements
All exposed raceway should be run parallel or perpendicular to wall or ceilings.
A sufficient number of homerun shall be installed so that excessive circuit loading will be eliminated.
If homerun are to be concealed by finish of the building, the maximum size of the homerun conduit tubing shall be trade size ¾.
The minimum size of raceway in industrial occupancies shall be trade size 3/4.
Overhead service conductor shall be run in metallic conduit and shall not be used for the installations supporting the overhead drop.
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Sufficient expansion fitting for the application shall be installed.
Splices and taps shall not be made inside the raceway
Do not used raceway to support enclosure except as permitted by the NEC.
All conductors and neutrals of the same circuit and all equipment grounding conductors shall be contained within the same raceway.
The raceway system shall be complete, including tightening of joints, from termination point to termination point prior to the installation of conductor.
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SELF-CHECK 4.1 A. Direction: On your answer sheet, write the letter of your answer. 1. Neutral conductor shall be placed:
A. within the same conduit C. separate circuit
B. the other conduit D. anywhere
2. It is the minimum size of conduit which can be installed in an
industrial occupancies A. 1/2 B.3 /4
C. 1
D. 1 ½
3. It is a type of fitting which is used to change direction
A. connector
B. coupling
C. adaptor
D. coupling
4. It is a short length conduit or tubing which is used for the purpose of
short extension A. connector condulets
B. coupling
C. nipple
D.
5. It is the type of bend which is used for circuit homerun
A. offset
B. elbow
C. saddle
D. goose neck
B. Direction: Name the following Intermediate Metallic Conduit materials.
6.
7.
8.
9.
10.
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JOB SHEET 4.1 INSTALL IMT Supplies and Materials
Serving cap Panel box Utility box Octagonal box Panel box Flush receptacle Incandescent bulb Connector (IMT) Metal strap IMT
Tools and Equipment
Wiring booth Metric rule Try square Bench vise Hack saw / pipe cutter Level Plumb bob Chalk line Screw driver Hammer Personal protective equipment - gloves - goggles - hard hat - tight clothes
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Plan / Working Drawing
CB
1
2
Procedure 1.
Prepare the necessary tools, materials and equipment as stated above.
2.
Read / interpret the working drawing.
3.
Wear appropriate PPE.
4.
Remove knockout on metallic boxes where conduit will enter boxes.
5.
Layout the position at all electrical boxes based on the given drawing plan.
6.
Install boxes.
7.
Cut conduit to desired length.
8.
Ream conduit ends.
9.
Make the necessary bend of the conduit.
10. Secure conduit to boxes using connector and locknuts 11. Check the horizontality and verticality of the mounted boxes. 12. Perform good housekeeping.
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Assessment Criteria The students will be evaluated based on the following: MEASUREMENT All dimensions will be in mm center to center with a tolerance of + - 3mm. WORKMANSHIP Includes bending, cutting, supporting and installing electrical metallic tubing. Bending Cutting Supporting Horizontality and verticality SPEED SAFETY USE OF TOOLS TOTAL
LO 4. LAYOUT AND INSTALL INTERMEDIATE METALLIC TUBING PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
20 pts. 10 pts. 10 pts 10 pts. 10 pts. 10 pts. 10 pts. 10 pts. 10 pts. 100%
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ASSESSMENT PLAN Course Title
:
BUILDING WIRING INSTALLATION
Unit of Competency
:
PERFORM ROUGHING-IN ACTIVITIES FOR COMMUNICATION SYSTEM USING ELECTRICAL METALLIC CONDUIT
Module Title
:
Roughing-in Activities for Communication and Distribution System Using Electrical Metallic Conduit
Work Sample
Written Test*
Oral Questioning*
Observation
Assessment Criteria
Demonstrati on
Assessment Methods
LO 1. Install electrical metallic tubing 1. PEC provisions in installing EMT are strictly followed 2. Electrical metallic tubing bends are freed from any defects according to job requirements and specifications and OHS 3. Electrical metallic tubing is installed according to job requirements and specifications and OHS 4. Personal Safety in installing EMT is followed. 5. Workplace is cleaned and made safe upon completion of work according to established standard. 6. Tools/equipment and materials needed for the installation are prepared in line with job requirements. 7. Completion report is prepared upon completion of job
x x x x x
x x x
LO 2. Install rigid steel conduit 1. Uses and application of rigid steel conduit are strictly followed according to the Philippine Electrical Code Standards. 2. Rigid steel conduit bends are free from any defects according to established standards. 3. Rigid metallic conduit is installed according to job requirements and specifications. 4. RMC are leveled horizontally and vertically aligned to the structure. 5. RMC support is fabricated according to job requirements 6. Personal safety in installing RSC is followed. 7. Workplace is cleaned and made safe upon completion of job according to established standard
x x x x x x x
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8. Tools/equipments and materials needed for the installation are prepared in line with job requirements. 9. Completion report is prepared upon completion of job
x x
LO 3. Install flexible metallic tubing 1. PEC provisions in installing FMC are strictly followed. 2. Flexible metallic conduit is installed in line with the job requirements 3. Personal safety in installing FMC is observed. 4. Workplace is cleaned and made safe upon completion of work according to established standard. 5. Tools and equipment needed for the installation are prepared in line with job requirements. 6. Completion report is prepared upon completion of job.
x x x x x x
LO 4. Install intermediate metallic tubing 1. PEC provisions in installing IMC are strictly followed. 2. Bending of intermediate metal conduit is performed in accordance with prescribed procedure and work requirement 3. Intermediate metal conduit is installed according to job requirements and specifications and OHS 4. Workplace is cleaned and made safe upon completion of work according to established standard. 5. Tools and equipment and materials needed for the installation are prepared in line with job requirements. 6. Completion report is prepared upon completion of job
x x x x x x
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Observation Checklist Student’s name: Teacher’s name: Name of School: Competency standards Unit of competency: Instructions for the assessor: 1. Observe the student [insert description of activity being observed]. 2. Describe the assessment activity and the date on which it was undertaken. 3. Place a tick in the box to show that the student completed each aspect of the activity to the standard expected in the enterprise. 4. Complete the feedback sections of the form. Date of observation Description of assessment activity Location of assessment activity The student….
If yes, tick the box
can
Did the student’s overall performance meet the standard?
Yes
No
Feedback to student: Teacher’s signature:
Date:
ASSESMENT PLAN PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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Observation and Questioning Checklist Student’s name: Teacher’s name: Name of School: Competency standards Unit of competency: Instructions for the teacher: 1. Observe the student [insert description of activity being observed]. 2. Describe the assessment activity and the date on which it was undertaken. 3. Place a tick in the box to show that the student completed each aspect of the activity to the standard expected in the enterprise. 4. Ask the student a selection of the questions from the attached list to confirm his/her underpinning knowledge 5. Place a tick in the box to show that the student answered the questions correctly. 6. Complete the feedback sections of the form. Date of observation Description of assessment activity Location of assessment activity The student…. can
If yes, tick the box
Did the student’s overall performance meet the standard?
Yes
No
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Demonstration Student’s name: Teacher’s name: Unit of competency: Competency standards: Date of assessment: Time of assessment: Instructions for demonstration Given the necessary materials the student must be able to:
Materials and equipment:
to show if evidence is demonstrated
During the demonstration of skills, did the student:
Yes
No
N/A
The student’s demonstration was: Satisfactory
Not Satisfactory
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Written report Student’s name: Teacher’s name: Name of School: Competency standards Unit of competency: Task: Your task is to: [insert description of task] Submission date: Use the checklist below as a basis for judging whether the student’s report meets the required competency standards. The student’s report….
If yes, tick the box
Overall did the student’s report meet the standard?
Yes
No
Comments:
Student’s signature:
Date:
Teacher’s signature:
Date:
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PERFORMANCE TEST Student's Name
Date
Competency:
Directions: CALL TEACHER, ask teacher to assess your performance in the following critical task and performance criteria below
Test Attempt 1st 2nd 3rd OVERALL EVALUATION Level Achieved
You will be rated based on the overall evaluation on the right side.
PERFORMANCE LEVELS
4 - Can perform this skill without supervision and with initiative and adaptability to problem situations. 3 - Can perform this skill satisfactorily without assistance or supervision. 2 - Can perform this skill satisfactorily but requires some assistance and/or supervision. 1 - Can perform parts of this skill satisfactorily, but requires considerable assistance and/or supervision. Teacher will initial level achieved.
PERFORMANCE STANDARDS For acceptable achievement, all items should receive a "Yes" or "N/A" response.
Yes
No
N/A
Get from Performance criteria of the module
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ANSWER KEY 1.1 A. Direction: On your answer sheet, write the letter of your answer. A
1. It is the type of metal conduit which is designed to lessen or eliminate fire hazard. A. EMT B. RSC C. PVC D. BX
C
2. It is the allowable number of quarter bends which can be done in a one run of electrical metallic conduit. A. 2 B.3 C. 4 D. 6
A
3. It is a type of fitting which is used to secure EMT to metallic boxes. A. connector B. condulets C. adaptor D. coupling
B
4. It is the size of conduit which can accommodate a maximum of 10 wires AWG # 12. A. 3/8 B. 1/2 C. 3/4 D. 1 ¼
B
5. It is the type of bend which make one quarter turn is a ______. A. offset B. elbow C. saddle D. goose neck
B. Direction: Name the following conduit fittings.
6.
Connector
7.
Elbow
8.
Coupling
9.
Locknut
10.
Adapter
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ANSWER KEY 2.1 Direction: On your answer sheet, write the letter of your answer. A
1. It is a process of removing sharp edges or burrs left after cutting the pipe. A. Reaming B. Cutting C. Bending D. Installing
C
2. It is the type of condulet which makes conduit run turns to the right. A. C
B
D A
B.LL
C. LB
3. It is a tool used to thread rigid metal conduit. A. hickey B. dies and dies stock cutter
D. LR C. reamer
D.
4. It is a type of condulet which has an opening at the back. A. C B.LL C. LB
D. LR
5. It is the standard length of RMC. A. 10 ft. B. 12 ft.
D. 20 ft.
C. 14 ft.
Essay Why is it important to follow PEC provisions in the use and application of rigid metal conduit wiring? Answer: It is necessary for all of us to follow the PEC because it is the basis of the installer to perform a job. It is a set of rules and regulation which govern all electrical wiring, and its main purpose is to have fire free environment
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ANSWER KEY 3.1 A. Direction: On your answer sheet, write the word or words being referred to by the statement. Metal straps or clamps
1. It is the support used to hold the flexible
50 feet
2. It is the minimum length of conduit in a single
8 conductors
3. It is the maximum number of conductors for a
Flexible metallic tubing
metallic conduit. roll. trade size no. 12 AWG. in a ½ diameter size conduit. 4. FMT means
___________________________________. Coupling and connector
5. It is the fitting used for joining flexible to
metal conduit In wet location In hoist way In storage battery room In hazardous location When exposed to oil, gasoline or materials which affect rubber
6. These
are the locations where conduits are not allowed to use.
metallic
B. Direction: Name the following Flexible Metallic Conduit materials.
7.
8.
FMT connector
FMT connector
9.
10.
FMT clamp
FMT
ANSWER KEY PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
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ANSWER KEY 4.1 A. Direction: On your answer sheet, write the letter of your answer. A
1. Neutral conductor shall be placed:
A. within the same conduit C. separate circuit B
B. the other conduit D. anywhere
2. It is the minimum size of conduit which can be installed in an
industrial occupancies A. 1/2 B.3 /4 D
B. coupling
C. adaptor
D. coupling
4. It is a short length conduit or tubing which is used for the purpose of
short extension A. connector condulets A
D. 1 ½
3. It is a type of fitting which is used to change direction
A. connector C
C. 1
B. coupling
C. nipple
D.
5. It is the type of bend which is used for circuit homerun
A. offset
B. elbow
C. saddle
D. goose neck
B. Direction: Name the following Intermediate Metallic Conduit materials.
6.
Elbow
7.
8.
Coupling
9.
10.
Square box
Coupling
Intermediate Metal Conduit
ANSWER KEY PERFORMING ROUGHING IN ACTIVITIES FOR COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT
Page
61
Republic of the Philippines
Department of Education PUBLIC TECHNICAL-VOCATIONAL HIGH SCHOOLS
mhar
cueto
Unit of Competency: INSTALL COMMUNICATION, SIGNALING DEVICES AND REMOTE CONTROL SYSTEMS ON AUXILIARY EQUIPMENT
Module No.:
3
Module Title: INSTALLING OF COMMUNICATION, SIGNALING DEVICES AND REMOTE CONTROL SYSTEMS ON AUXILIARY EQUIPMENT
ACKNOWLEDGMENT Copyright Department of Education 2008 First Published JUNE 2008 This draft was prepared during the Competency-Based Learning Materials Development Workshop conducted at the Marikina Hotel, Marikina City on February 18-22, 2008 and finalized on May 23-25, 2008 at the Development Academy of the Philippines (DAP), Tagaytay City. This learning instrument was developed by the following personnel: Technology Teacher: MR. RODRIGO S. CASTILLO Bauan Technical High School Poblacion 2, Bauan, Batangas Contextual Teacher: MS. GINA C. DELOS SANTOS A.F.G. Bernardino Memorial Trade School Lias, Marilao, Bulacan Facilitators: DR. CORAZON ECHANO DepED – Tech-Voc Task Force Project Coordinator Encoder: MR. LEMUEL C. VALLES Fund: Department of Education REFERENCES AND FURTHER READING 1. Azares, Efren F. and Recana, Cirilo B. Practical Electricity III; Adriana Publishing: 1999. 2. Agpaoa, Feleciano. Interior and Exterior Wiring Troubleshooting; National Bookstore: 1991. 3. http://daymore.engineer.gvsu.edu/
TABLE OF CONTENTS Page How to Use this Module ................................................................................... i Introduction .................................................................................................... ii Technical Terms ............................................................................................. iii Learning Outcome 1: Layout and install alarm system Learning Experiences/Activities ............................................................. 2 Information Sheet 1.1 ............................................................................ 4 Self-Check 1.1 ..................................................................................... 11 Operation Sheet 1.1 ............................................................................. 12 Operation Sheet 1.2 ............................................................................. 13 Operation Sheet 1.3 ............................................................................. 14 Job Sheet 1.1 ...................................................................................... 15 Information Sheet 1.2 .......................................................................... 19 Self-Check 1.2 ..................................................................................... 25 Information Sheet 1.3 .......................................................................... 26 Self-Check 1.3 ..................................................................................... 36 Operation Sheet 1.4 ............................................................................. 37 Operation Sheet 1.5 ............................................................................. 39 Job Sheet 1.2 ...................................................................................... 41 Learning Outcome 2: Layout and install intercommunication system Learning Experiences/Activities ........................................................... 46 Information Sheet 2.1 .......................................................................... 47 Self-Check 2.1 ..................................................................................... 54 Job Sheet 2.1 ...................................................................................... 55 Assessment Plan ........................................................................................... 58 Observation checklist .................................................................................... 59 Observation and Questioning checklist ......................................................... 60 Demonstration .............................................................................................. 61 Written Report .............................................................................................. 62 Performance test ........................................................................................... 63 Answer Key 1.1 ............................................................................................. 64 Answer Key 1.2 ............................................................................................. 65 Answer Key 1.3 ............................................................................................. 66 Answer Key 2.1 ............................................................................................. 67
HOW TO USE THIS MODULE Welcome to the Module “Installation of Communication, Signaling Devices and Remote Control Systems on Auxiliary Equipment”. This module contains training materials and activities for you to complete. The unit of competency ―Install Communication, Signaling Devices and Remote Control Systems on Auxiliary Equipment” contains the knowledge, skills and attitudes required for Building Wiring Installation course required to obtain the National Certificate (NC) level II. You are required to go through a series of learning activities in order to complete each of the learning outcomes of the module. In each learning outcome there are Information Sheets, Job Sheets, Operation Sheets and Activity Sheets. Do these activities on your own and answer the Self-Check at the end of each learning activity. If you have questions, don‘t hesitate to ask your teacher for assistance. Recognition of Prior Learning (RPL) You already have some basic knowledge and skills covered in this module. If you can demonstrate competence to your teacher a particular skill, talk to your teacher so you don‘t have to undergo the same training again. If you have a qualification or Certificate of Competency from previous trainings show it to him/her. If the skills you acquired are consistent with and relevant to this module, they become part of the evidence. You can present these for RPL. If you are not sure about your competence skills, discuss this with your teacher. After completing this module, ask your teacher to assess your competence. Result of your assessment will be recorded in your competency profile. All the learning activities are designed for you to complete at your own pace. In this module, you will find the activities for you to complete and relevant information sheets for each learning outcome. Each learning outcome may have more than one learning activity. This module is prepared to help you achieve the required competency, in receiving and relaying information. This will be the source of information that will enable you to acquire the knowledge and skills in Building Wiring Installation NC II.
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Program/Course:
BUILDING WIRING INSTALLATION NC II
Unit of Competency:
INSTALL COMMUNICATION, SIGNALING DEVICES AND REMOTE CONTROL SYSTEMS ON AUXILIARY EQUIPMENT
Module Title:
Installation of Communication, Signaling Devices and Remote Control Systems on Auxiliary Equipment
INTRODUCTION: This module contains information and suggested learning activities on installation of communication, signaling devices and remote control systems on auxiliary equipment. It includes instructions and procedure on how to install alarm and intercommunication system. Completion of this module will help you understand the succeeding module on installing communication device and remote control system. This module consists of two (2) learning outcomes. Each learning outcome contains learning activities with instruction sheets. Before you follow the instruction, read the information sheets and answer the self-check and activities provided to assess your competence by your teacher. He/she will check if you have acquired the knowledge necessary to perform the skill portion of the particular learning outcome. Upon completing this module, report to your teacher for assessment. If you pass the assessment, you will be given a certificate of completion. SUMMARY OF LEARNING OUTCOMES Upon completion of the module the students should be able to: LO1 Layout and install alarm system LO2 Layout and install intercommunication system ASSESSMENT CRITERIA Refer to assessment criteria of learning outcomes 1-2 of this module. PREREQUISITES Basic and Common Competencies
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TECHNICAL TERMS Belt Pack is a portable intercom station worn on the belt. It requires a headset or handset. Coil is a magnetic wire wound around in an iron bar. Door Station is like sub-stations wherein these units are only capable of initiating a call to a Master Station. They are typically weather-proof. Electromagnet is a coil of wire wound around the soft iron bar. Handset is a permanent or portable telephone-style connection to an intercom station. It holds both an earpiece and a push to talk microphone. Headset is a portable intercom connection from a belt pack to one or both ears via headphones with integrated microphone on a boom arm. It connects to a belt pack. Intercom Station is a full-featured remote unit that is capable of initiating and receiving party-line conversation, individual conversation and signalling. It may be rack-mounted, wall-mounted or portable. Master Stations or Base Stations are units that can control the system, i.e., initiate a call with any of the stations and make announcements over the whole system. Power Supply is used to feed power to all units. It is often incorporated into the design of the base station. Push button is a momentary contact switch. Relay is a device which is used to switch electrical system. Reset is a method of returning electrical contacts to its original position. Sub-stations are units that are capable of only initiating a call with a Master Station but not capable of initiating calls with any other stations. Transformer is an electrical device capable of converting a given voltage to a desired voltage. Trip is a condition which makes the circuit ON or OFF after a certain period of time or condition. Wall Mount Station is a fixed-position intercom station with built-in loudspeaker. It may have flush-mounted microphone, hand-held push to talk microphone or telephone-style handset.
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Program/Course:
BUILDING WIRING INSTALLATION NC II
Unit of Competency:
INSTALL COMMUNICATION, SIGNALING DEVICES AND REMOTE CONTROL SYSTEMS ON AUXILIARY EQUIPMENT
Module Title:
Installation of Communication, Signaling Devices and Remote Control Systems on Auxiliary Equipment
Learning Outcome 1: Layout and install alarm system Assessment Criteria 1. Alarm devices are mounted in line with working drawing, PEC standards and prescribed procedure. 2. Types of sensors and detectors are identified according to application. 3. Condition of alarm devices is tested in line with manufacturer‘s instruction. 4. Alarm system is wired following prescribed procedure and working drawing. 5. Parts and function of relay and magnetic contactors are identified. 6. Control system is installed in line with job requirements. 7. Work area is cleaned and made safe upon completion of the job. 8. Work report is prepared in line with established policy. References 1. Azares, Efren F. and Recana, Cirilo B. Practical Electricity III; Adriana Publishing: 1999. 2. Agpaoa, Feleciano. Interior and Exterior Wiring Troubleshooting; National Bookstore: 1991. 3. http://daymore.engineer.gvsu.edu/~jackh/books/int
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LEARNING EXPERIENCES/ACTIVITIES Learning Outcome 1: Layout and install alarm system Learning Activities 1.
Read information sheet1.1 about the types of alarming device.
2.
Do the self-check.
Special Instructions
Do not write anything on the module.
Prepare an extra sheet of paper for your answer sheet on the SelfCheck and other practice materials / sheets (e.g. Operation Sheets, Activity Sheets and Job Sheets).
3.
Read operation sheet 1.1 about the checking condition of: buzzer bell chime
4.
Perform operation sheets about the checking and testing of bell, buzzer and chime.
Ask your teacher to demonstrate the procedure of checking alarm devices
5.
Perform job sheet 1.1 about the installation of alarm system.
Follow strictly the working drawing
6.
Read information sheet 1.2 the types of sensors switch.
7.
Do the self-check.
8.
Read information sheets 1.3 about the PEC provisions in installing relay and magnetic contactor.
2
9.
Do the self-check.
10. Perform operation sheet 1.3 about the checking and testing of relay.
Ask your teacher to demonstrate the procedure of checking relay
11. Perform operation sheets in checking and testing magnetic contactor.
Ask your teacher to demonstrate the procedure of checking magnetic contactor
12. Perform job sheet 1.2 about the wiring connection of start, stop and reversible motor control system.
Follow the Drawing Plan strictly.
Wear PPE in doing the job.
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INFORMATION SHEET 1.1 PEC REQUIREMENTS IN INSTALLING SIGNAL AND ALARM INTRODUCTION Signal and alarm are just like installing lighting circuit which involve switch or push button, signal equipment and a conductors. There are provisions that should be followed in installing signal and alarm wiring.
Signaling wires must not be placed on the same cross-armor which occupy the same circuit with electric light or power lines nor come closer less than 5 inches ,unless enclosed with permanent tubing. Where wires are bunched vertically, they must be enclosed in a conduit or provided with fire resistant covering to prevent fire from traveling from floor to floor. Transformer and other devices for supplying current for light and power circuit must be designed expressly for the purpose Splices and joints should conform to the PEC regulations to ensure mechanically and electrically safe joints Protective devices must be installed as near a possible to the point of entrance.
Theories and principles of signal and alarm system All signal and alarm system has its specific function and uses which the purpose and need of its user. Deciding which of these devices will be used can easily be done if you have basic knowledge of the feature and components of each device in installing this kind of circuit. The signal and alarm system may come in remote control, automatic or manual in nature. These devices include the buzzer, the bell, the chime the code-calling system, the signal light and the like. The conductor of this system uses a small wire commonly no. 18 or 16 copper wires solid or stranded. In some cases batteries had been used as power source, whenever that AC source is available, a step down transformer ranging from 6v- 18v is usually used. This is to lessen the use and trouble of the batteries.
4
Types of signal and alarm system Electric bell is an alarm that produces an audible alarm tone when electrical energy is applied.
Parts of electric bell
Electromagnet (N\S): It is a magnetic wire wound around the insulated soft iron bolt; it produces strong magnetic attraction. Hammer or beater (striker): This is a small ball attached to the armature which strikes the gong. Gong bell: A concave disc that produces loud sound when stuck by the hammer. Adjustable contacts: It serves as the contact switch to the spring.
Electric Bell. When the switch is pushed closed, the circuit is completed and current flows through the electromagnetic coil.
5
The buzzer A buzzer is an alarming device that produces a buzzing sound which is caused by the rapid vibration of armature. The sound of buzzer is not as loud as bell considering the structure that bell has gong while buzzer has thin metal that produces sound, but they operate in the same principles.
Parts of buzzer
Electromagnet attracts and repels thin metal sheet which move rapidly backed and forth. Metal strip is a thin sheet of electromagnetic materials which vibrates when electromagnet is energized and produces a buzzing sound.
The principle of buzzer
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The novel buzzer The novel buzzer circuit uses a relay in series with a small audio transformer and speaker. When the switch is pressed, the relay will operate via the transformer primary and closed relay contact. As soon as the relay operates, the normally closed contact will open, removing power from the relay, the contacts close and the sequence repeats, all very quickly...so fast that the pulse of current causes fluctuations in the transformer primary, and hence secondary. The speakers tone is thus proportional to relay operating frequency. The capacitor C can be used to "tune" the note. The nominal value is 0.001uF, increasing capacitance lowers the buzzers tone
Schematic diagram of novel buzzer
The Annunciator Annunciator wiring systems are installed for the purpose of having all calls terminated at a central station. An annunciator is a device used to indicate by visual sign that transmit over electric call bell circuit. It is commonly used in hospitals, elevators, hotels, offices, residences and other places where call is required with bell. Types of Annunciator The most commonly used annunciator are the following:
Gravity drop Lamp annunciator
The gravity drop The gravity drop annunciator is composed of the drops, the bell and the reset rack, the drop which shows the circuit number, consists of shutter, an electromagnet and the armature. The reset rack is used to hold the drop in the indicating position after being released and return to original position when necessary, the shutter which is used to reset the rack and bell that makes an alarm so that the call will be determined.
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The Standard Lamp Annunciator The standard lamp annunciator circuit operates as follows: when push button one is pressed, the circuit is completed and permits the lamp 1 to turn on causing the buzzer to be energized since it is connected series to the line from the transformer and back. The buzzer is connected in common to every button in the circuit.
Modern annunciator console
Burglar Alarm Wiring The burglar alarm wiring system is an improvement of call bell and annunciator system, the equipment and general wiring are similar, however, push button devices are installed on door, wall, windows floor mat and some strategic place where the burglar intruders are likely to pass. The burglar alarm system can be:
The open-circuit alarm system The closed-circuit alarm system
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The open-circuit alarm The circuit switches are installed on doors, window, switches that automatically open and close as soon as the door or window is forced to open causing the bell to ring. The diagram below shows an open-circuit burglar alarm system.
Open circuit burglar alarm
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The closed circuit burglar alarm The closed-circuit burglar alarm system operates the same way as the open type system, the only difference is the position of the switch and the use of relay. In this circuit, all switches are closed: when the doors and window are forced to open, the switches will automatically open which causes the relay to be energized and complete the bell circuit that makes it ring.
Electronic module burglar alarm
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SELF-CHECK 1.1 A.
Direction: Identify the word or words being referred to by the statement. Write the answer on your answer sheet. 1.
It is an alarming device which produces an audible alarm tone when electric energy is applied on it.
2.
It is a concave iron disk that produces loud sound when struck by the hammer.
3.
It is a kind of wire which is capable of producing electromagnet when electric current is applied.
4.
It is an alarming device which produces a buzzing sound. If the bell has hammer, the buzzer has ______________. The pitch of the chimes depend on _______. It is a device which is able to supply low voltage power as replacement for battery.
5. 6. 7. 8. 9.
It is the recommended size of wire used for signal and alarm system. It is the purpose of using the alarm.
B. Direction: Draw the internal and external parts of a bell and label its parts. (5 pts.)
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OPERATION SHEET 1.1 CHECK CONDITION OF BUZZER Supplies and Materials Buzzer
Tools and Equipment Multitester Personal protective equipment - gloves - goggles
Procedure 1. Prepare the necessary tools, materials, equipment and personal protective equipment (PPE) in performing the activity. 2. Wear the appropriate PPE. 3. Set the multitester to range X1 to X10.
4. Connect the test probe of the multi tester to the terminals of the buzzer (See the terminal marking of buzzer). Zero or low resistance reading shows that the coil terminal of the buzzer is shorted, no reading means open If the reading shows 6 – 60 ohms value, the coil is good. Assessment Direction: Using the table given below, check the condition of: Buzzer No.
open
short
good
1. 2. 3.
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OPERATION SHEET 1.2 CHECK CONDITION OF BELL Supplies and Materials Bell
Tools and Equipment Multitester Personal protective equipment - gloves - goggles
Procedure 1. Prepare the necessary tools, materials, equipment and personal protective equipment (PPE) in performing the activity. 2. Wear the appropriate PPE. 3. Set the multitester to range X1 to X10.
4. Connect the test probe of the multi tester to the terminals of the bell (See the terminal marking of bell). Zero or low resistance reading shows that the coil terminal of the buzzer is shorted, no reading mean open If the reading shows 6 – 60 ohms value, the coil is good. Assessment Direction: Using the table given below, check the condition of: Bell No.
open
short
good
1. 2. 3.
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OPERATION SHEET 1.3 CHECK CONDITION OF CHIME Supplies and Materials Chime
Tools and Equipment Multitester Personal protective equipment - gloves - goggles
Procedure 1. Prepare the necessary tools, materials, equipment and personal protective equipment (PPE) in performing the activity. 2. Wear the appropriate PPE. 3. Set the multitester to range X1 to X10.
4. Connect the test probe of the multi tester to the terminals of the chime (See the terminal marking of chime). Zero or low resistance reading shows that the coil terminal of the buzzer is shorted, no reading means open If the reading shows 6 – 60 ohms value, the coil is good. Assessment Direction: Using the table given below, check the condition of: Chime No.
open
short
good
1. 2. 3.
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JOB SHEET 1.1 INSTALL BUZZER / BELL CIRCUIT Supplies and Materials
Bell/buzzer Panel box Push button switch Transformer 220/12volts Wire no. 18 Wire support Electric tape Schematic diagram
Tools and Equipment
Wiring booth VOM tester Metric rule Try square Bench vise pliers Level Plumb bob Chalk line Screw drivers Hammer Personal protective equipment - gloves - goggles - hard hat - tight clothes
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Plan / Working Drawing
B 1
Simple circuit connection
B 1
Buzzer bell controlled in several locations
16
Front and back entrance using bell and buzzer
The annunciator system
17
Procedure 1. Prepare the necessary tools, materials and equipment. 2. Read/interpret the schematic diagram. 3. Wear appropriate PPE. 4. Layout and measure the position of all electrical materials based on the given schematic diagram. 5. Install buzzer/bell push button switch and the control transformer. 6. Wire the circuit as seen in the schematic diagram. 7. Test the circuit for open, short and continuity of the connections. 8. Perform good house keeping. 9. Have your teacher check your work Evaluation CRITERIA Functionality Use of tools Use of PPE Horizontality / Verticality Work Attitude Speed TOTAL
POINTS 50 10 10 10 10 10 100
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INFORMATION SHEET 1.2 SENSOR SWITCHES Sensor A device, like a photoelectric cell, that receives and responds to a signal or stimulus. Switch A device used to break or open an electric circuit or to divert current from one conductor to another.
Common symbols used for switches
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The photoelectric sensor switch A photoelectric sensor is another type of position sensing device. Photoelectric sensors use a modulated light beam that is either broken or reflected by the target. The control consists of an emitter (light source) a receiver to detect the emitted light and associated electronics that evaluate and amplify the detected signal causing the photoelectric output switch to change state. The schematic diagram below shows a sample on how sensor is applied. Common application of photo sensor switch
Verifying objects in clear bottles Counting cans Controlling parking gates Counting IC chips Detecting presence of objects in a conveyor Counting packages Detecting full open and closed valve Level measurement in large vessels Vehicle sensing and positioning
Parts and description 270 ohm resistor 10k resistor LED Infrared sensitive photo transistor Prototyping circuit board
Portable motion detector switch A portable security alarm system including a movement detecting and signal transmitting member for mounting on or proximate to the object whose movement is to be detected. A signal receiving and alarm generating member for receiving a signal from the movement detecting and signal transmitting member and producing a security response. It is also a remote control for actuating and de-actuating the signal receiving and alarm generating member, an environmental monitoring member for sensing an environmental condition and providing a signal to the signal receiving and alarm generating member, a visual information gathering member for gathering visual information and providing a signal to the signal receiving and alarm generating
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member, an audio output member for receiving a signal from the signal receiving and alarm generating member and generating an audio output, and components for delivering a security notification to remote recipients. A security network that includes the alarm system is also disclosed. An inertial sensor for alarm system or for activating or deactivating a device is additionally disclosed. Broad field motion detector A broad field motion detector is a motion sensing system device and method which utilize dispersed ultrasonic radiation is disclosed. The system preferably comprises a low profile sensor unit configured to couple to a ceiling position. The sensor unit comprises an ultrasonic transmitter and an ultrasonic receiver and a pair of acoustic reflectors positioned in a transmitting path of the ultrasonic transmitter and a receiving path of the ultrasonic receiver for generating and detecting the ultrasonic radiation in a broadcast field. The acoustic reflectors preferably comprise cones, conical cross-sections and/or combinations thereof which are integral with the ultrasonic transmitter and the ultrasonic receiver and/or are coupled to a housing structure for positioning the acoustic reflectors in the transmitting and/or receiving paths. The sensor unit also preferably comprises a circuit for driving the transmitter and for detecting motion by detecting changes in the receiver signal. In further embodiments, the system also includes an infrared sensor and is configured to generate a response based on the combination of changes in the receiver signal and a signal form the infrared sensor. Smoke detector switch A smoke detector switch is a sensing device which detects fire hazard at earliest stage. It detects smoke and heat using chamber filled ionized air. Rays from radioactive source ionize the atom of air in the chamber after which the charged particles carry current between the top and bottom plates of the chamber. Smoke entering the chamber attacks the charged articles so that the amount of current passing between electrodes is reduced. When current is dropped, a message is sent to the control unit, which activates the alarm. Factors to be considered in installing the smoke detector:
If battery operated, always put date to the battery. Always check the internal parts for damage or loose contacts. Check internal contact of the battery or supply circuit.
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Pressure Switches Pressure switches are control devices that respond to the change of pressure in liquid or air. The liquid or air is referred to as fluid pressure. They open or close the electrical contacts in response to the pressure changes by either turning on or off the motor or closing louvers, signaling warning light or horn. For load 5hp the pressure switch may handle the current directly. For larger loads the pressure switch is used to energize relays, contactor or magnetic starter, which then energizes the load.
Pressure switches are frequently used to maintain a specified pressure range in a storage tank. Storage tank can be used to hold liquid such as water, oil, or gas such as air. In the example below, the pressure switch is used.
Pictorial diagram of gas bulb controlled by pressure switch
22
Schematic diagram of pressure switch
SPRING BIASED COMPARATOR SCHEMATICS
PRESSURE REGULATOR
VACUUM REGULATOR
COMPARATOR (ADJUSTABLE BIAS)
VACUUM SWITCH
23
PRESSURE SWITCH
RECOMMENDED ORIFICE SIZES: .007 .010 .005
STANDARD FOR FASTER RESPONSE FOR LOWER SUPPLY CONSUMPTION
R-4104 SERES SUPPLIED AS SHOWN
V-4104 SERES SUPPLIED AS SHOWN
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SELF-CHECK 1.2 A. Directions: On your answer sheet, write the letter of the correct answer. 1. It is a device which receives and responds to a signal or stimulus. A. switch B. sensor C. cell D. infrared 2. It is a device which is used to break or divert current flow. A. switch B. sensor C. cell D. infrared 3. It is the type of sensor device which use light beam which is either broken or reflected. A. photoelectric B. pressure C. detector D. photo transistor. 4. It is an electronic component commonly used as photo detector. A. photoelectric B. pressure C. detector D. photo transistor 5. It is a portable security alarm system which receive signal through movement. A. motion detector B. photo sensor C. signal injector D. spring biased comparator
B. Direction: Draw the corresponding symbols of the following sensor components: 1. 2. 3. 4. 5. 6. 7.
electronic limit switch level switch pressure switch temperature switch flow switch limit switch speed switch
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INFORMATION SHEET 1.3 RELAY AND MAGNETIC CONTACTOR PEC provisions The term ―controller‖ includes any switch or devices normally used to start and stop by making or breaking the motor circuit current. For portable motor rated at 1/3 horse power or less, the controller shall be permitted to be an attachment to plug or receptacles. Controller designs
Each controller shall be capable of starting and stopping the motor it controls
Auto transformer shall provide an on and off position, a running position, and at least one starting position. It shall be designed that it cannot rest in the starting position or any position that will render the overload device inoperative
The controller shall have a horse power rating not lower than the horse power rating of the motor
NEC provisions The National Electrical Code (NEC) defines a controller as a device or group of devices that serve to govern, in some predetermined manner, the electrical power delivered to apparatus to which it is connected. As it is applied to control circuits, this means anything from simple pendant switch to complex circuit that may include relays, contactors, timers, switches and indicating light. Certain example of simple electrical circuit is a bulb and the switch used to control the bulb on and off. In some complex example, the motor control can be used to start and stop a motor controlling a small water pump. In a more difficult task, motor controller can be used for reversing, changing speed, jogging, sequencing or a traffic light control and conveyors. Electrical control can be operated manually or automatically. For example, some may have a toggle switch and manual starter to start and stop the motor. Some machines are started and stopped automatically, but it is still a common practice that manual and automatic operation are integrated in a control circuit. To fully understand this course, the following contents must be considered.
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Magnetic starter
Magnetic contactor
Electrical symbols In order to understand the basic ideas and information being given, familiarization of the symbols are greatly in need. Symbols are the language of control system.
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28
29
Electrical materials and equipment used in the control system
Push button switches
These are control devices used to manually open and close the set of electrical contact. It may come in flush mount or extended mount with mushroom head. The contacts may be normally closed, normally open or combination contacts.
Pilot lights
It is a visual information which indicates that circuit is in operation. Lights are usually used for on and off operation, indicating, caution, changing set-up and alarm signaling. The pilot light may come in red which is visual indication that motor is running, green it normally indicates that the system is off or deenergized. Some pilot lights come in blue, white and amber.
Control Transformer
Control transformers are used to step the voltage needed in the given operation of the circuit. It is often desirable to operate at the control circuit at a low voltage operation.
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Control Relays
The most commonly control components is the relay. They are used widely for switching several contacts of starting coil, pilot light and some audible alarm. This can also be used for switching to separate the high and low voltage source and AC and DC source.
Overload Relay
Overload relays are designed to meet the special protective needs of motor control circuits. Over load relays: -
Allow harmless temporary overload, such as motor starting, without disrupting the circuit. Will trip and open the circuit if current is high enough to cause motor damage over a period of time Can be reset once the overload is reset
Trip class
Overload relay are rated by a trip class, which is defined as the length of time. It will take for relay to trip in an overload condition. Trip classes are class 10, class 20 and class 30.
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Magnetic contactor and starter
The function of the magnetic contactor is similar to electromagnet, its main purpose is to hold contact while the system is in operation. For example, a magnetic contactor is used to control the operation of power pump. The magnetic field of the contactor attracts the armature to the magnet which in turn closes the normally open contacts and opens the normally closed contacts. When the electromagnetic coil is de-energized, the magnetic field collapse and the movable contact is released under spring pressure.
Start Stop Station Controlling Single Phase Motor
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Sample connection of reversible control
33
Ladder or Line Diagram
Ladder diagrams
The method of expressing the language of control symbols is a line diagram, also referred to as ladder diagram. The diagram is composed of control circuit and the power circuit. Usually, control circuit is expressed in lighter- weight line and power circuit is represented by heavier weight- line. The line diagrams are read from left to right.
Power circuit and control circuit
The power circuit, indicate by the heavier line, is what actually distributes power from the source to the connected load (motor). The control circuit, indicated by lighter weight- line, is used to control the distribution power. Ladder diagrams are specialized schematics commonly used to document industrial control logic systems. They are called "ladder" diagrams because they resemble a ladder, with two vertical rails (supply power) and as many "rungs" (horizontal lines) as there are control circuits to represent. If we wanted to draw a simple ladder diagram showing a lamp that is controlled by a hand switch, it would look like this:
The "L1" and "L2" designations refer to the two poles of a 120 VAC supply, unless otherwise noted. L1 is the "hot" conductor, and L2 is the grounded ("neutral") conductor. These designations have nothing to do with inductors, just to make things confusing. The actual transformer or generator supplying power to this circuit is omitted for simplicity. In reality, the circuit looks something like this:
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Typically in industrial relay logic circuits, but not always, the operating voltage for the switch contacts and relay coils will be 120 volts AC. Lower voltage AC and even DC systems are sometimes built and documented according to "ladder" diagrams:
In ladder diagrams, the load device (lamp, relay coil, solenoid coil, etc.) is almost always drawn represented by lines off lighter and heavier. Look at this circuit:
Electric motor It is an electrical device which converts electrical energy into mechanical energy. Motor can be an AC or DC type, single phase two phase or three phase. This device is commonly used in industrial commercial and utility application. It can also be a part of mechanical equipment such as winder, conveyor or mixer.
Compressor motor
Three phase motor
Single phase
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SELF-CHECK 1.3 A.
Direction: Identify the word or words being referred to by the statement. Write the answer on your answer sheet. 1. It is a diagram which is usually represented by lightweight line. 2. It is a kind of switch which is usually controlled manually the close and open contact. 3. It is a device which is used to step the voltage to a desired value. 4. It is the usual color of pilot light which indicate that motor is running. 5. It is considered as the language of control system.
B. Direction: Using the illustrations given below, write the name of components and devices.
__________ 1.
________ 4.
__________ 2.
________ 5.
__________ 3.
________ 6.
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OPERATION SHEET 1.4 CHECK CONDITION OF RELAY Supplies and Materials
Relay
Tools and Equipment
Multitester Personal protective equipment - gloves - goggles
Procedure 1. Prepare the necessary tools, materials, equipment and personal protective equipment (PPE) in performing the activity. 2. Wear the appropriate PPE. 3. Set the multitester to range X1 to X10.
37
4. Connect the test probe of the multi tester to the terminals of the chime (See the terminal marking of chime). Zero or low resistance reading shows that the coil terminal of the buzzer is shorted, no reading means open. If the reading shows 6 – 60 ohms value, the coil is good.
5. Connect the test probe to normally open terminal of the relay (30 87), high resistance shows that contact is good 6. Then, connect the test probe to the normally closed contacts (30 87a), low resistance shows that the contact is good. 7. Have your teacher check your work.
38
OPERATION SHEET 1.5 CHECK CONDITION OF MAGNETIC CONTACTOR Supplies and Materials
Magnetic contactor
Tools and Equipment
Multitester Personal protective equipment - gloves - goggles
Procedure 1. Prepare the necessary tool, materials equipment and PPE in performing the activity. 2. Wear appropriate PPE. 3. Set the multi tester to range X1 or X10. 4. Connect the test probe of the multi tester to the terminals of the contactor holding coil (X1 X2). Zero or low resistance reading shows that the coil terminal of the holding coil is shorted. If the reading shows 6 – 60 ohms value, the coil is good. (Note: The terminal marking printed on the contactor, it is also indicated on the diagram below) 5. Connect the test probe to auxiliary contact normally open of the magnetic contactor (13 14), high resistance shows that contact is good. (Note: Pointer deflection of the multi-tester will indicate the condition of the contacts.)
39
6. Then, connect the test probe to the main contacts (L1 T1, L2 T2, L3 T3). Low resistance shows that the contact are good. 7. Have your teacher check your work.
40
JOB SHEET 1.2 INSTALL START / SHORT, FORWARD REVERSE MOTOR CONTROL Supplies and Materials
Magnetic contactor Circuit protective device Overload relay Push button switch Wire connector stranded no 18 Screws
Tools and Equipment
Wiring booth Wiring plan Electric motor Multitester Set of screw driver Pliers Personal protective equipment - gloves - goggles - tight clothes
41
Plan / Working Drawing
42
43
Procedure 1. Prepare the necessary tools, materials and equipment. 2. Read / interpret the working drawing. 3. Wear appropriate PPE. 4. Mark the location of the control devices given on the wiring plan. 5. Wire the control circuit based on the ladder. 6. Then, wire the motor circuit. 7. Check the functionality of the circuit using resistance test. 8. Perform good housekeeping. 9. Have your teacher check your work. Laboratory Work 1. Job instruction a. From the list of tools, materials, equipment and personal protective equipment (PPE) with the aid of the given schematic and procedures. b. Perform the installation of alarm system. c. The installation must be done in 4 hours. Evaluation The activity will be graded based on the following: Functionality Workmanship Speed Safety Use appropriate PPE Proper use of tools and corresponding safety
40 pts. 30 pts 10 pts. 10 pts. 10 pts. TOTAL
100%
44
Program/Course:
BUILDING WIRING INSTALLATION NC II
Unit of Competency:
INSTALL COMMUNICATION, SIGNALING DEVICES AND REMOTE CONTROL SYSTEMS ON AUXILIARY EQUIPMENT
Module Title:
Installation of Communication, Signaling Devices and Remote Control Systems on Auxiliary Equipment
Learning Outcome 2: Layout and install intercommunication system Assessment Criteria 1. Intercom wirings are installed in accordance with the latest provision of the PEC. 2. Personal protective equipment are selected and used. 3. Intercom diagram is read and installed in accordance with the job requirement. 4. Work scheduled activity is strictly followed to ensure the completion of work in an agreed time 5. Workplace is cleaned and made safe upon completion of the job. 6. Final report is prepared upon completion of the job. 7. Intercom wirings are installed in accordance with the latest provision of the PEC. References 1. Azares, Efren F. and Recana, Cirilo B. Practical Electricity III; Adriana Publishing: 1999. 2. Agpaoa, Feleciano. Interior and Exterior Wiring Troubleshooting; National Bookstore: 1991. 3. http://daymore.engineer.gvsu.edu/~jackh/books/int
45
LEARNING EXPERIENCES/ACTIVITIES Learning Outcome 2: Layout and install intercommunication system Learning Activities
Special Instructions
1. Read Information Sheet 2.1 about the installation of intercom system 2. Do the Self-Check
Do not write anything on the module.
Prepare an extra sheet of paper for your answer sheet on the SelfCheck and other practice materials / sheets (e.g. Operation Sheets, Activity Sheets and Job Sheets).
3. Perform Job Sheet 2.1 in installing intercom system
Ask your teacher to demonstrate the procedure of installing intercom system
46
INFORMATION SHEET 2.1 TOOLS, MATERIALS AND EQUIPMENT USED IN THE INSTALLATION OF INTERCOM SYSTEM Intercom system An intercom system is an electronic communication device intended for limited private dialogue, directions, collaborations or announcement. Intercom can be portable or permanently mounted in buildings. Intercom can incorporate with telephones, walkie talkies and other mechanical such as signal lights and door latches. A permanently installed intercom is generally composed of fixed microphone with speaker unit which is connected to central control panel by wires. A small home intercom might connect a few rooms in house. Larger system might connect all rooms in a school or hospital to central office. Intercom system in large building usually functions as public address system.
Intercom access control system are available with option of one call and one hand set to multiple call stations with hundreds of hand set. Intercom facilities can be available in audio only and audio video facilities. The audio and video system allows you to see who is calling at your front door, offices or gate before you allow or deny access. An intercom system can be connected to electric door, gates or electric locking devices.
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Door & Camera Intercoms Feel safe and secure answering your front door or gate without physically having to open them. The Hills intercom allows you to talk to the person and determine if they are known to you before you let them in. For added safety, you can disable front door answering from certain room stations e.g. children‘s bedrooms, preventing them from opening the door to strangers. A different door bell or chime sound may be used for different doors e.g. front, back, gate etc. to help you identify where the visitor is located. Bedroom Intercoms Ensure your peace of mind by being able to monitor your children when they are sleeping or playing. With the ‗automute‘ function, you won‘t be disturbed until the noise level from the monitored room station reaches a level that deserves your attention e.g. a crying baby. When your children are playing, the hands-free reply feature means you can communicate freely with them—they can answer you when you call without having to press any buttons. And with ‗sleep mode‘, you can program your room station to play music when you‘re ready for bed and automatically switch off after a certain time elapses. Master Kitchen Intercoms You can speak privately from any room station to other room station. By using the ‗selective room calling‘ feature, people in other rooms will not be disturbed. Using the Master Station, you are able to set the alarm clock, and choose which room stations will hear it. Make sure those who need to get up are up on time, and those who can sleep in are left alone. The Master Station has a digitally tuned AM / FM radio. Press one button to listen to your favorite radio station from any room within your home. Each room station retains individual control of volume.
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Video / Lounge Intercoms Not only you can hear your children when they are inside—the ‗monitor / camera‘ unit shows you what they are doing, whether they are inside or outside. Wherever your cameras are placed, the signal comes back to the monitor on this station for you to view. You can also switch between camera locations and monitor doors and gates, using them in conjunction with the front door answering units to see who is at your door. Wiring Intercom While every intercom product line is different, most analogue intercom systems have much in common. Voice signals of about a volt or two are carried atop a direct current power rail of 12, 30 or 48 volts which uses a pair of conductors. Signal light indications between stations can be accomplished through the use of additional conductors or can be carried on the main voice pair via tone frequencies sent above or below the speech frequency range. Multiple channels of simultaneous conversations can be carried over additional conductors within a cable multiple channels can easily be carried by packed switch digital intercom signals. Portable intercoms are connected primarily using common shielded, twisted pair microphone cabling terminated with 3pin XLR connectors. Building and vehicle intercoms are connected in a similar manner with shielded cabling often containing more than one twisted pair. Two-wire intercom Intercom systems are widely used in TV stations and outside broadcast vehicles such as those seen at sporting events or entertainment venues. There are essentially two different types of intercoms used in the television world: twowire party line or four-wire matrix systems. In the beginning, TV stations would simply build their own communication systems using old phone equipment. However, today there are several manufacturers offering off-the-shelf systems. From the late 70's until the mid 90's the two-wire party line type systems were the most popular, primarily due to the technology that was available at the time. The two channel variety used a 32 Volt impedance generating central power supply to drive external stations or belt packs. This type of format allowed the two channels to operate in standard microphone cable, a feature highly desired by the broadcasters. These systems were very robust and simple to design, maintain and operate but had limited capacity and flexibility as they were usually hardwired. A typical user on the system could not choose who to talk to.
49
He would communicate with the same person or group of people until the system was manually reconfigured to allow communication with a different group of people. Two-wire routers or source assignment panels were then implemented to allow quick re-routing of a two-wire circuit. This reconfiguration was usually handled at a central location, but because voltage is used on the circuit to power the external user stations as well as communicate, there would usually be a pop when the channels were switched. So while one could change the system on-the-fly, it was usually not desirable to do so in the middle of a production, as the popping noise would distract to the rest of the production crew.
50
Four-wire intercom Intercom systems are widely used in TV stations and outside broadcast vehicles such as those seen at sporting events or entertainment venues. There are essentially two different types of intercoms used in the television world: two-wire party line or four-wire matrix systems. In the beginning, TV stations would simply build their own communication systems using old phone equipment. However, today there are several manufacturers offering off-the-shelf systems. From the late 70's until the mid 90's the two-wire party line type systems were the most popular, primarily due to the technology that was available at the time. The two channel variety used a 32 Volt impedance generating central power supply to drive external stations or belt packs. This type of format allowed the two channels to operate in standard microphone cable, a feature highly desired by the broadcasters. These systems were very robust and simple to design, maintain and operate but had limited capacity and flexibility as they were usually hardwired. A typical user on the system could not choose who to talk to. He would communicate with the same person or group of people until the system was manually reconfigured to allow communication with a different group of people. Two-wire routers or source assignment panels were then implemented to allow quick re-routing of a twowire circuit. This reconfiguration was usually handled at a central location, but because voltage is used on the circuit to power the external user stations as well as communicate, there would usually be a pop when the channels were switched. So while one could change the system on-the-fly, it was usually not desirable to do so in the middle of a production, as the popping noise would distract to the rest of the production crew. All signal and alarm system has its specific function and uses which the purpose and need of its user. Deciding which of this device will be used can easily be done if you have basic knowledge of the feature and components of each devices in installing this kind of circuit.
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Wireless intercom For installations where it is not desirable or possible to run wires to support an intercom system, there are wireless intercom systems available. There are two major benefits of a wireless intercom system over the traditional wired intercom. The first is that installation is much easier since no wires have to be run between intercom units. The second is that you can easily move the units at any time. But with that ease of installation and convenience there is risk of interference from other wireless and electrical devices. Other wireless devices such as cordless telephones, wireless data networks, and remote audio speakers can interfere if they are near the intercom. Electrical devices such as motors, lighting fixtures and transformers can cause noise. There may be concerns about privacy since conversations may be picked up on a scanner, baby monitor, cordless phone, or a similar device on the same frequency. Encrypted wireless intercoms can reduce or eliminate privacy risks and placement, installation, construction, grounding and shielding methods can reduce or eliminate the detrimental effects of external interference. The United States and Canada have several frequency ranges for wireless intercom systems and other wireless products. They are 49MHz, FM band (200KH - 270KHz), 494-608 MHz, 900MHz, 2.4GHz, 5.8GHz, and MURS (150 MHz). There are also power line communication units that send signal over house wiring that have been referred to as wireless intercoms.
52
53
SELF-CHECK 2.1 A.
Direction: Identify the word or words being referred to by the statement. Write the answer on your answer sheet. 1. It is the easiest installation.
and
simplest
type
of
intercom
2. Electrical devices such as motors, lighting fixtures and transformers can cause noise when it is placed ______ to the units. 3. It is the type of intercom systems widely used in TV stations and outside broadcast vehicles such as those seen at sporting events or entertainment venues. 4. These are the types of inter com system where can you hear and see your children doing using monitor or camera. 5. These are the types of intercom which insure your peace of mind by being able to monitor your children when they are sleeping or playing. 6. Intercom in larger ____________ system.
building
usually
functions
as
7. It is an intercom system which is used at front, back, gate etc. to help you identify where the visitor is located. 8. The two major benefits of a wireless intercom system over the traditional wired intercom. 9. It is the purpose of using the alarm. B. Direction: List down common devices used in the intercom system. 1_____________________ 2_____________________ 3_____________________ 4_____________________ 5_____________________
54
JOB SHEET 2.1 INSTALL INTERCOM DEVICES Supplies and Materials
Intercom console Intercom devices Panel box Push button switch Transformer 220\32volts Intercom connector Wire support Electric tape Schematic diagram
Tools and Equipment
Wiring booth VOM tester Intercom modules Hammer Screw driver Pliers Personal protective equipment - gloves - goggles - hard hat
55
Plan / Working Drawing Two wire intercom
Four wire intercom
56
Wireless intercom
Procedure 1. Prepare the necessary tools, materials and equipment. 2. Read / interpret the schematic diagram. 3. Wear appropriate PPE. 4. Layout and measure the position of intercom devices based on the given schematic diagram. 5. Install intercom based on the given work drawing. 6. Wire the circuit as seen in the schematic diagram. 7. Test the circuit for open, short and continuity of the connections. 8. Perform good house keeping. 9. Have your teacher check your work Evaluation The activity will be graded based on the following: Functionality Workmanship Speed Safety Use appropriate PPE
50 pts. 30 pts 10 pts. 10 pts. TOTAL
100%
57
ASSESSMENT PLAN Evidence Checklist Competency standard: Unit of competency:
Written
Portfolio
Demonstration
The evidence must show that the candidate …
Questioning
Observation
Ways in which evidence will be collected: [tick the column]
Third party Report
Title of Module
Get from assessment criteria of the module (CBC)
NOTE: *Critical aspects of competency Prepared by:
Date:
Checked by:
Date:
58
Observation Checklist Student’s name: Teacher’s name: School Competency standards Unit of competency: Instructions for the teacher: 1. Observe the student [insert description of activity being observed]. 2. Describe the assessment activity and the date on which it was undertaken. 3. Place a tick in the box to show that the student completed each aspect of the activity to the standard expected in the enterprise. 4. Complete the feedback sections of the form. Date of observation Description of assessment activity Location of assessment activity The student….
If yes, tick the box
can
Did the student‘s overall performance meet the standard?
Yes
No
Feedback to student: Teacher signature:
Date:
59
Observation and Questioning Checklist Stuednt’s name: Teacher’s name: School Competency standards Unit of competency: Instructions for the assessor: 1. Observe the student [insert description of activity being observed]. 2. Describe the assessment activity and the date on which it was undertaken. 3. Place a tick in the box to show that the student completed each aspect of the activity to the standard expected in the enterprise. 4. Ask the student a selection of the questions from the attached list to confirm his/her underpinning knowledge 5. Place a tick in the box to show that the student answered the questions correctly. 6. Complete the feedback sections of the form. Date of observation Description of assessment activity Location of assessment activity The candidate…. can
If yes, tick the box
Did the student‘s overall performance meet the standard?
Yes
No
60
Demonstration Student‘s name: Teacher‘s name: Unit of competency: Competency standards: Date of assessment: Time of assessment: Instructions for demonstration Given the necessary materials the student must be able to:
Materials and equipment:
to show if evidence is demonstrated
During the demonstration of skills, did the candidate:
Yes
No
N/A
The student‘s demonstration was: Satisfactory
Not Satisfactory
61
Written report Student’s name: Teacher’s name: School Competency standards Unit of competency: Task: Your task is to: [insert description of task] Submission date: Use the checklist below as a basis for judging whether the student’s report meets the required competency standards. The student’s report….
can solve quantities needed through percentage
can tabulate data correctly
can convert temperature to the required temperature scale
can fill in appropriate form completely and correctly
can identify proper method of sealing packed products
can label correctly packed products
Overall did the student‘s report meet the standard?
If yes, tick the box
Yes
No
Comments:
Student’s signature:
Date:
Teacher’s signature:
Date:
62
PERFORMANCE TEST Student's Name
Date
Competency:
Directions: CALL TEACHER, ask teacher to assess your performance in the following critical task and performance criteria below You will be rated based on the overall evaluation on the right side.
Test Attempt 1st 2nd 3rd OVERALL EVALUATION Level Achieved
PERFORMANCE LEVELS
4 - Can perform this skill without supervision and with initiative and adaptability to problem situations. 3 - Can perform this skill satisfactorily without assistance or supervision. 2 - Can perform this skill satisfactorily but requires some assistance and/or supervision. 1 - Can perform parts of this skill satisfactorily, but requires considerable assistance and/or supervision. Teacher will initial level achieved.
PERFORMANCE STANDARDS For acceptable achievement, all items should receive a "Yes" or "N/A" response.
Yes
No
N/A
Get from Performance criteria of the module (TR)
63
ANSWER KEY 1.1 A.
Direction: Identify the word or words being referred to by the statement. Write the answer on your answer sheet. bell
1. It is an alarming device which produces an audible alarm tone when electric energy is applied on it.
chime
2. It is a concave iron disk that produces loud sound when struck by the hammer.
magnetic wire
3. It is a kind of wire which is capable of producing electromagnet when electric current is applied.
buzzer metal strip a
4. It is an alarming device which produces a buzzing sound. 5. If the bell has hammer, the buzzer has ______________. 6. The pitch of the chimes is depends on _______.
step down transformer
7. It is a device which is able to supply low voltage power as replacement for battery.
#16 & # 18
8. It is the recommended size of wire used for signal and alarm system. 9. It is the purpose of using the alarm.
to call attention
B. Direction: Draw the internal and external parts of a bell and label its parts. (5 pts.)
64
ANSWER KEY 1.2 A. Directions: On your answer sheet, write the letter of the correct answer. A
1. It is a device which receive and respond to a signal or stimulus A. switch B. sensor C. cell D. infrared
A
2. It is a device which is used to break or divert current flow A. switch B. sensor C. cell D. infrared
A
3. It is type of sensor device which use light beam which is either broken or reflected A. photoelectric B. pressure C. detector D. photo transistor
D
4. It is an electronic component commonly used as photo detector A. photoelectric B. pressure C. detector D. photo transistor 5. It is portable security alarm system which receive signal through movement A. motion detector B. photo sensor C. signal injector D. spring biased comparator
A
B. Direction: Draw the corresponding symbols of the following sensor components: 1. 2. 3. 4. 5. 6. 7.
electronic limit switch level switch pressure switch temperature switch flow switch limit switch speed switch
65
ANSWER KEY 1.3 A.
Direction: Identify the word or words being referred to by the statement. Write the answer on your answer sheet. control diagram
1. It is a diagram which is usually represented by light-weight line.
push button switch
2. It is a kind of switch which is usually controlled manually the close and open contact.
transformer
3. It is a device which is used to step the voltage to a desired value.
red
4. It is the usual color of pilot light which indicate that motor is running. 5. It is considered as the language of control system.
ladder
B. Direction: Using the illustrations given below, write the name of components and devices.
start stop push button switch
pilot bulb
single phase motor
relay switch
overload relay
step down transformer
66
ANSWER KEY 2.1 A.
Direction: Identify the word or words being referred to by the statement. Write the answer on your answer sheet. wireless
1. It is the easiest and simplest type of intercom installation.
close
2. Electrical devices such as motors, lighting fixtures and transformers can cause noise when it is placed ______ to the units.
two wire intercom
3. It is type of intercom systems widely used in TV stations and outside broadcast vehicles such as those seen at sporting events or entertainment venues. 4. These are the types of inter com system where can you hear and see your children doing using monitor or camera. 5. These are the types of intercom which insure your peace of mind by being able to monitor your children when they are sleeping or playing.
video lounge bedroom types
public address
6. Intercom in larger building usually functions as ____________ system.
door & camera intercom
7. It is an intercom system which is used at front, back, gate etc. to help you identify where the visitor is located.
Installation is much easier Can easily move the units at any time
8. The two major benefits of a wireless intercom system over the traditional wired intercom.
Private dialogue, directions, collaborations or announcement II.
9. It is the purpose of using the alarm.
B. Direction: List down common devices used in the intercom system. 1. 2. 3. 4. 5.
speaker microphones push button alarm clock bell, buzzer chimes
67
Republic of the Philippines
Department of Education PUBLIC TECHNICAL-VOCATIONAL HIGH SCHOOLS
mhar
cueto
Unit of Competency: COMMISSION INSTALLED ELECTRICAL SYSTEM
Module No.:
4
Module Title: COMMISSIONING ELECTRICAL SYSTEM
ACKNOWLEDGMENT Copyright Department of Education 2008 First Published JUNE 2008 This draft was prepared during the Competency-Based Learning Materials Development Workshop conducted at the Marikina Hotel, Marikina City on February 18-22, 2008 and finalized on May 23-25, 2008 at the Development Academy of the Philippines (DAP), Tagaytay City. This learning instrument was developed by the following personnel: Technology Teacher: Mr. Rommel M. Medida AFG Bernardino Memorial Trade School Lias, Marilao, Bulacan Contextual Teacher: Ms. Gina C. delos Santos A.F.G. Bernardino Memorial Trade School Lias, Marilao, Bulacan Facilitators: Dr. Corazon C. Echano TechVoc Task Force Encoder: Mr. Lemuel C. Valles Administrative Officer II Educational Information Division Fund: Department of Education REFERENCES AND FURTHER READINGS 1. Institute of Integrated Electrical Engineers Incorporated. Philippine Electrical Code of 1992.
of
the
Philippines
2. Max B. Fajardo Jr. & Leo R. Fajardo. Electrical Layout and Estimate, 2nd Edition. 3. Azares, Efren F. and Recana, Cirilo B. Practical Electricity III; Adriana Publishing: 1999. 4. Roland E. Palmquist. Audel House Wiring, 7th Edition.
TABLE OF CONTENTS Page How to Use this Module ................................................................................... i Introduction .................................................................................................... ii Technical Terms ............................................................................................. iii Learning Outcome 1: Perform preliminary activities for commissioning Learning Experiences/Activities ............................................................. 2 Information Sheet 1.1 ............................................................................ 2 Self-Check 1.1 ....................................................................................... 7 Learning Outcome 2: Ensure normal operability of electrical system Learning Experiences/Activities ............................................................. 9 Operation Sheet 2.1 ............................................................................... 9 Operation Sheet 2.2 ............................................................................. 11 Operation Sheet 2.3 ............................................................................. 12 Operation Sheet 2.4 ............................................................................. 13 Operation Sheet 2.5 ............................................................................. 15 Operation Sheet 2.6 ............................................................................. 17 Learning Outcome 3: Finalize commissioning activities Learning Experiences/Activities ........................................................... 20 Information Sheet 3.1 .......................................................................... 20 Self-Check 3.1 ..................................................................................... 21 Activity Sheet 3.1 ................................................................................. 22 Assessment Plan ........................................................................................... 23 Observation Checklist ................................................................................... 24 Observation and Questioning Checklist ......................................................... 25 Demonstration .............................................................................................. 26 Written Report .............................................................................................. 27 Performance Test .......................................................................................... 28 Answer Key 1.1 ............................................................................................. 29 Answer Key 3.1 ............................................................................................. 29
HOW TO USE THIS MODULE Welcome to the Module “Commissioning Electrical System”. This module contains training materials and activities for you to complete. The unit of competency “Commission Installed Electrical Systems” contains the knowledge, skills and attitudes required for Building Wiring Installation course required to obtain the National Certificate (NC) level II. You are required to go through a series of learning activities in order to complete each of the learning outcomes of the module. In each learning outcome there are Information Sheets, Job Sheets, Operation Sheets and Activity Sheets. Do these activities on your own and answer the Self-Check at the end of each learning activity. If you have questions, do not hesitate to ask your teacher for assistance. Recognition of Prior Learning (RPL) You may already have some basic knowledge and skills covered in this module. If you can demonstrate competence to your teacher in a particular skill, talk to your teacher so you do not have to undergo the same training again. If you have a qualification or Certificate of Competency from previous trainings show it to him/her. If the skills you acquired are consistent with and relevant to this module, they become part of the evidence. You can present these for RPL. If you are not sure about your competence skills, discuss this with your teacher. After completing this module, ask your teacher to assess your competence. Result of your assessment will be recorded in your competency profile. All the learning activities are designed for you to complete at your own pace. In this module, you will find the activities for you to complete and relevant information sheets for each learning outcome. Each learning outcome may have more than one learning activity. This module is prepared to help you achieve the required competency in receiving and relaying information. This will be the source of information that will enable you to acquire the knowledge and skills in Building Wiring Installation NC II independently at your own pace with minimum supervision from your teacher.
i
Program/Course:
BUILDING WIRING INSTALLATION NC II
Unit of Competency:
COMMISSION INSTALLED ELECTRICAL SYSTEM
Module Title:
Commissioning Electrical System
INTRODUCTION: This module contains information and suggested learning activities in the installation of wiring devices for floor and ground fault current interrupting outlets. It includes instructions and procedure on how to install and select electrical boxes. This module consists of three (3) learning outcomes. Each learning outcome contains learning activities supported by instruction sheets. Before you perform the instructions, read the information sheets and answer the self-check and activities provided to ascertain to yourself and your instructor that you have acquired the knowledge necessary to perform the skill portion of the particular learning outcome. Upon completing this module, report to your instructor for assessment to check your achievement of knowledge and skills requirements of this module. If you pass the assessment, you will be given a certificate of completion. SUMMARY OF LEARNING OUTCOMES Upon completion of the module the students shall be able to: LO1 Perform preliminary activities for commissioning LO2 Ensure normal operability of electrical system LO3 Finalize commissioning activities ASSESSMENT CRITERIA Refer to assessment criteria of learning outcomes 1-3 of this module. PREREQUISITES Basic and Common Competency
ii
TECHNICAL TERMS Amprobe's Phase Sequence and Motor Rotation Tester is used to assure used to assure proper and safe connection of the electrical equipment on threephase systems Amperage (Amps) is a measure of electrical current flow. Circuit breaker or fuses is used to protect against over-current and short circuit conditions that could result in potential fire hazards and explosion. Closed circuit is a circuit where electricity flows from an energy source to the desired endpoint of the circuit. Commissioning is a process of verifying that building systems operate and function at a high performance level, as designed. Commissioning Process is a quality-oriented process for achieving, verifying and documenting that the performance of the facilities, systems, and assemblies meets the defined objectives and criteria. Ground/grounding is a conducting connection, whether intentional or accidental, by which an electric circuit or equipment is connected to the earth, or to some conducting body of relatively large extent that serves in place of the earth. Hipot tester is an electronic device used to verify the electrical insulation in a cable, printed circuit board, electric motor, transformer or other wired assembly. LCD refers to Liquid Crystal Display. Multi-tester is used to measure the voltage, the resistance or the current of a circuit. It is connected in either parallel or series with the circuit depending on what to measure. Megger is an instrument used to measure the insulation resistance of conductors or wire. It is measured in ohms or meg-ohms. Open circuit is a circuit constructed from conductors that are separately supported by insulators. PPE refers to Personal Protective Equipment. Short circuit is an abnormal electrical path. VAC refers to Voltage Alternating Current. VDC refers to Voltage Direct Current. Voltage (volts) is a measure of electrical potential.
iii
Program/Course:
BUILDING WIRING INSTALLATION NC II
Unit of Competency:
COMMISSION INSTALLED ELECTRICAL SYSTEM
Module Title:
Commissioning Electrical System
Learning Outcome 1: Perform preliminary activities for commissioning Assessment Criteria 1. Scope of work is confirmed to ensure clear understanding of job elements. 2. Planning of commissioning activity is performed in line with work requirements. 3. Materials, tools and equipment needed for commissioning are prepared according to work requirements. References: 1. Institute of Integrated Electrical Engineers of the Philippines Incorporated. Philippine Electrical Code of 1992. 2. Max B. Fajardo Jr. & Leo R. Fajardo. Electrical Layout and Estimate, 2nd Edition. 3. Azares, Efren F. and Recana, Cirilo B. Publishing: 1999.
Practical Electricity III; Adriana
4. Roland E. Palmquist. Audel House Wiring, 7th Edition. 5. www.des.od.nih.gov/eWebb/…/commissioning/nih_cxguide/cxspecs/16995 55k 6. www.epa.gov/rtp/new-bldg/environmental/0910updf 7. www.megger.com/au/products 8. www.omnicontrols.com/manufacturer.megger.aspx 9. www.amprove.com/manuals/PRMZ-pdf 10.www.wikihow.com/use-a-multimeter 11.www.acmehowto.com/howto/maintenance/electrical/onthevoltage.htm
1
LEARNING EXPERIENCES/ACTIVITIES Learning Outcome 1: Perform preliminary activities for commissioning Learning Activities
Special Instructions
1. Read the attached Information Sheet 1.1 on: Scope of work Different work activities in commissioning Equipment needed for commissioning
You can ask the assistance of your teacher to explain topics you cannot understand.
2. Answer Self-Check 1.1 to test your knowledge on the different work activities and scope of work in commissioning. 3. Compare your answer to Answer Key 1.1. 4. When you are ready, you can proceed to L.O. 2.
INFORMATION SHEET 1.1 DIFFERENT WORK ACTIVITIES NEEDED IN COMMISSIONING INTRODUCTION The enjoyment of opening a new building or starting up a new mechanical or electrical system can be annoying quickly if the system does not work the way manufacturer, integrator or designers intended. One way to help avoid this disappointment and subsequent costly refinements or repairs is Commissioning. Commissioning helps ensure that the system/s will meet the needs of the owner and occupants. It also verifies that the designed system meets the owners
2
requirements and that construction confirms to the contract documents and the system/s operate as needed. Commissioning building usually covers air conditioning, electrical, communications, security and fire management system and their controls. It may also include other systems and components, particularly if they are unusual or complex. Electrical System Commissioning A. Work included
Systems and equipment testing and start-up. Validation of proper and thorough installation of systems and equipment Equipment performance verification. Functional testing of electrical systems. Documentation of tests, procedures, and installations. Coordination of training.
B. Scope
Systems to be commissioned include the following: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12.
Secondary Service Electrical Systems Motor Control Centers Distribution and Branch circuit panel boards Lighting Fixtures and Controls Lightning Protection Equipment and Lightning Protection Systems Equipment Monitoring Fire Alarm Equipment/Fire Alarm Equipment Monitoring System AC motors Grounding Equipment and Building Grounding System Security System Emergency Generators and Distribution System Uninterruptible Power Systems
Along with drawings and equipment manuals, a final commissioning report is also submitted to the owner. A complete commissioning report contains:
All record of the commissioning procedures Testing results Deficiency notices and records of the deficiencies.
satisfactory
corrections
of
The following areas are addressed: general commissioning criteria, commissioning plan, documentation requirements, verification procedures system functional performance tests, deferred performance tests, corrective
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measures, acceptance documentation, post commissioning follow-up procedures and examples of commissioning. General system testing requirements The purpose of electric systems commissioning is to increase the reliability of electric power system after installation by identifying problems and providing a set of baseline values for comparison with subsequent routine tests. A procedure should be developed to include a planned approach (road map) of what should be done in order to verify the proper system installation. This procedure is the commissioning plan. Specific areas addressed in a commissioning plan include the verification of the installation of all equipment/components, interface connections between equipment and individual system, and interconnection drawings. The development of this test plan specific to each system and/or component is key to the usefulness of any maintenance program. The plan consists of: a) the schedule of when acceptance and routine tests should be performed; b) test forms to be used to record the outcome of the tests which are retained for comparison with previous and subsequent tests; and c) a listing of the required test devices. Since the results of the commissioning tests become baseline test values to compare with later tests and the results of the routine maintenance tests are compiled to identify any downward trend in performance, it is vital to the maintenance program to have accurate and complete records. To perform the testing, the plan lists all required tests in order of performance and gives a schedule for each test. The work items and schedule depend on many items including the importance and cost of the equipment, consequences of failure, age of equipment, past and future frequency of service, hours of operation, future maintenance availability, environmental conditions, and safety requirements. Component testing Commissioning requirements for the system components are typically provided with the original proposal for the procurement of the equipment. The requirements provided by the equipment manufacturer should be adhered to in addition to the recommended testing herein. Although there are many different components in any electrical system, there are some tests that are common among the equipment. Examples of the common testing procedures include the assembly check, alignment check, grounding verification, insulation resistance tests and polarization index to name a few. Sufficient time should be allocated to define the inspections required, perform the check, and document the results. A review of the system drawings will show major pieces of equipment. Specific procedures should be developed for each test referencing the equipment to be used, drawings to be followed, and step by step procedures with readings to be recorded and forms for the results.
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System commissioning testing Electrical system commissioning on new projects is critical to ascertain that a system is installed properly and that it will operate as designed. The commissioning of a system encompasses the individual testing of the related components, the verification of the component interconnection against the drawings, and the functional testing of the system as a whole. An understanding of the equipment involved and the modes of operation for a system are essential to the development of the system commissioning plan. A survey of the equipment of the system and listing the equipment in order of importance and startup is the first step in developing the commissioning plan. The schedule of the tests and inspections is dependent on many aspects of the equipment such as its importance and cost, the frequency of service, hours of operation, environmental conditions, accessibility, and safety requirements. The inspection, testing, and startup plan is then developed in conjunction with this schedule with instructions and procedures for the test plan. Problems may arise during the testing of the equipment and system. In order to identify and correct these problems, troubleshooting techniques should be developed. Checking of equipment such as fuses, lights, and breakers for continuity, equipment calibration and settings, and investigating for faulty equipment or connections should be the first troubleshooting steps. For all problems, the equipment and component manuals are consulted for troubleshooting directions. Equipment Needed in Commissioning Multi-tester is used to measure the voltage, the resistance or the current of a circuit. It is connected in either parallel or series with the circuit depending on what to measure. A multimeter can be a hand-held device useful for basic fault finding and field service work or a bench instrument which can measure to a very high degree of accuracy. They can be used to troubleshoot electrical problems in a wide array of industrial and household devices such as batteries, motor controls, appliances, power supplies, and wiring systems.
Analog Multimeter
Digital multimeter
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Megger is an instrument used to measure the insulation resistance of conductors or wire. It is measured in ohms or meg-ohms. It is connected in parallel with the circuit. A megger (or sometimes meggar) is often used as an alternate term for an insulation tester - a circuit tester which puts a very high voltage at a very low current across two conductors to make sure that they are properly insulated. The word is short for megohm-meter High potential tester is an electronic device used to verify the electrical insulation in a cable, printed circuit board, electric motor, transformer or other wired assembly. A hipot tester is used to perform a high potential test. Generally a hipot tester consists of:
A source of high voltage, A current meter, A switching matrix used to connect the high voltage source and the current meter to all of the contact points in a cable. In addition to these parts a hipot tester may also have a microcontroller and a display to automate the testing process and display the testing results. A hipot tester can be very similar to a cable tester and often the two are combined into a single device. A hipot tester is used to verify the circuits that should be insulated. It is done by applying a high voltage between the circuits and making sure no current flows. In a typical wired assembly, a hipot test should connect all circuits in common to ground. Then, one by one the tester will disconnect a given circuit from ground and connect that circuit to high voltage. The current that flows is monitored to verify that it is low enough. Phase sequence tester - is two measurement devices in one unit that provides three functions - phase sequence identification, open phase condition and motor rotation indication. Amprobe's Phase Sequence and Motor Rotation Tester is used to assure proper and
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safe connection of the electrical equipment on three-phase systems. Phase sequence testing is crucial for some of the three-phase loads, whenever they need to be connected to the electrical system. Improper connection of three-phase motors may lead to reverse rotation, and as a result it may damage equipment powered by a motor. Note. In this module, the focus of the commissioning process lies on the following: Insulation resistance Earth resistance test Phase sequence test
SELF-CHECK 1.1 A. Direction: Enumerate the following: 1-12. Scope of commissioning electrical system 13-18. Work included in commissioning process B.
Direction: Identify the word or words being referred to by the statement. Write the answer on your answer sheet. 1. 2.
It is a device used to verify the electrical insulation in a cable, printed circuit board, electric motor, transformer or other wired assembly. It is used to assure proper and safe connection of the electrical equipment on three-phase systems.
3.
It is an instrument used to measure the insulation resistance of conductors or wire.
4.
It is used to measure either, the voltage, the resistance or the current of a circuit.
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Program/Course:
BUILDING WIRING INSTALLATION NC II
Unit of Competency:
COMMISSION INSTALLED ELECTRICAL SYSTEM
Module Title:
Commissioning Electrical System
Learning Outcome 2: Ensure normal operability of electrical system Assessment Criteria
1. 2. 3. 4. 5.
Continuity of circuit is measured following prescribed procedure. Insulation resistance is performed in following prescribed procedure. Supply voltage is measured following prescribed procedure. Earth resistance test is performed following prescribed procedure. Phase sequence testing is performed following prescribed procedure.
References: 1.
Institute of Integrated Electrical Engineers of the Philippines Incorporated. Philippine Electrical Code of 1992.
2.
Max B. Fajardo Jr. & Leo R. Fajardo. Electrical Layout and Estimate, 2nd Edition.
3.
Azares, Efren F. and Recana, Cirilo B. Publishing: 1999.
4.
Roland E. Palmquist. Audel House Wiring, 7th Edition.
5.
www.des.od.nih.gov/eWebb/…/commissioning/nih_cxguide/cxspecs/1699 555k
6.
www.epa.gov/rtp/new-bldg/environmental/0910updf
7.
www.megger.com/au/products
8.
www.omnicontrols.com/manufacturer.megger.aspx
9.
www.amprove.com/manuals/PRMZ-pdf
Practical Electricity III; Adriana
10. www.wikihow.com/use-a-multimeter 11. www.acmehowto.com/howto/maintenance/electrical/onthevoltage.htm
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LEARNING EXPERIENCES/ACTIVITIES Learning Outcome 2: Ensure normal operability of electrical system Learning Activities 1. Perform Operation Sheet 2.1 on testing the continuity of a circuit.
Special Instructions
You can ask the assistance of your teacher in case problems arise.
You can ask the assistance of your teacher in case problems arise.
2. Perform Operation Sheet 2.2 on tracing short circuit or overload. 3. Perform Operation Sheet 2.3 on testing the insulation resistance of a conductor.
4. Perform Operation Sheet 2.4 on measuring the supply voltage of an electrical circuit. 5. Perform Operation Sheet 2.5 on testing earth resistance.
6. Perform Operation Sheet 2.6 on testing phase sequence of a component.
OPERATION SHEET 2.1 TESTING THE CONTINUITY OF A CIRCUIT Tools and Equipment
Laboratory circuit board Multitester Screwdriver Side cutting pliers Combination pliers Personal protective equipment - gloves - goggles
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Procedure 1. Prepare the necessary tools, materials and equipment. 2. Wear the appropriate PPE. 3. Turn-off power to the circuit. If the voltage source is connected to the circuit during this test, you will damage the meter.
4. Select “resistance” on your multimeter (choose the lowest setting). If using an analog, you must first “zero” the meter by touching the test pros together and turning the thumbwheel until the needle set at zero. 5. Touch the probe tips across the component or portion of the circuit for which you want to determine continuity. 6. Read the meter. (Note: If the reading is low, it means you have continuity(the circuit is closed. If the reading is “infinity’, it means there is no continuity (the circuit is open) 7. Record the data you have gathered. 8. Perform good housekeeping. Safety precautions 1. Do not attempt to adjust, test or make a repair if you do not have basic repair skills or if you do not fully understand the directions. 2. Always practice proper and reasonable safeguards as well as those suggested by the manufacturer of the devices and tools you use. Assessment Criteria WORKMANSHIP ACCURACY OF TESTING USE OF TOOLS AND INSTRUMENTS USE OF PPE SPEED HOUSEKEEPING TOTAL
5 pts. 4 pts. 3 pts. 3 pts. 3 pts. 2 pts. 20 pts.
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OPERATION SHEET 2.2 TRACING A SHORT CIRCUIT OR OVERLOAD Tools and Equipment
Laboratory circuit board Multitester Screwdriver Side cutting pliers Combination pliers Personal protective equipment - gloves - goggles
Procedure 1. Prepare tools, materials and equipment needed. 2. Wear appropriate PPE. 3. Turn off all wall switches and unplug all lights and appliances. 4. Reset the circuit breaker. Pull the lever to off and then to on again to reset a circuit breaker with a lever switch. If a fuse is blown, it must be replaced. Unscrew the fuse to replace it with one with exactly the same amperage rating (both circuit breakers and fuses should be sized according to the wire used in the circuit they protect).
Note the following symptoms after resetting the breaker -
-
-
-
If the breaker trips immediately: the problem may be a short circuit in a receptacle or switch. If the breaker does not trip again, turn on each switch one at a time and check if and when the breaker trips again. If turning on a switch causes the breaker to trip, there is a short circuit in a fixture or receptacle controlled by the switch. If turning on the switch makes no difference, the problem is in one of the appliances connected to the switch. If the circuit went dead when you plugged in the appliance, the problem is probably in the cord or plug. If the circuit went dead when you turned on the appliance, the appliance itself is defective
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5. Mark devices, appliances or circuit with damage. Separate them if possible. 6. Report to the owner/occupant the test that you have done. 7. Perform good housekeeping. Caution To protect yourself, think “Safety First”. Use appropriate personal protective equipment such as safety glasses, face shields, insulating gloves, insulating boots, and/or insulating mats. Never ground yourself when taking electrical measurements. Always work with a partner. Assessment Criteria WORKMANSHIP ACCURACY OF TESTING USE OF TOOLS AND INSTRUMENTS USE OF PPE SPEED HOUSEKEEPING TOTAL
5 pts. 4 pts. 3 pts. 3 pts. 3 pts. 2 pts. 20 pts.
OPERATION SHEET 2.3 TESTING THE INSULATION RESISTANCE Tools and Equipment
Laboratory circuit board Insulation resistance tester Screwdriver Side cutting pliers Combination pliers Personal protective equipment - gloves and goggles
Procedure 1. 2. 3. 4. 5.
Prepare all tools, materials and equipment needed. Wear appropriate PPE. Use a multimeter or the voltage measurement function on the MegOhmMeter to make sure there is no power applied to the tested circuit. Select the appropriate voltage level. Plug one end of the black test lead to the common terminal on the meter and touch the test probe to a ground (earth)or another conductor. Sometimes it is helpful to ground all conductors that are not part of the test. Alligator clips can make measurements easier and more accurate.
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6.
Plug one end of the red test lead to the volt/ohm terminal on the meter and connect the test probe to the conductor to be tested. Press the test button to apply the desired voltage and read the resistance displayed on the meter. It could take a few seconds for the reading to settle. The higher the resistance is the better. Test each conductor against ground and against all the other conductors present in the conduit. Keep a dated record of the measured values in a safe place. If some of the conductors show low resistance, identify the problem or re-pull the conductors. Moisture, water, or dirt can create low resistance readings.
7. 8. 9.
Figure 1. How to test Precautions conductor resistance
Figure 2. Actual testing of insulation resistance
Adhere to the following four-step process before every test:
Take the equipment out of service Check what will be included in the test Discharge capacitance Check current leakage at switches
Assessment Criteria Workmanship Accuracy of Testing Use of Tools and Instruments Use of PPE Housekeeping TOTAL
6 pts. 4 pts. 4 pts. 3 pts. 3 pts. 20 pts.
OPERATION SHEET 2.4 MEASURING VOLTAGE IN A CIRCUIT Tools and Equipment Laboratory circuit board Multitester Screwdriver
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Side cutting pliers Combination pliers Personal protective equipment - gloves - goggles
Procedure 1. Prepare the necessary tools, materials and equipment needed. 2. Wear the appropriate PPE. 3. Set the meter to the appropriate range for the voltage you expect to find. (Note; When measuring an unknown voltage, select the highest range and workdown.)
4. Touch the negative probe to a known ground and touch the positive lead to the wire you are testing. 5. View the reading on the display and record it. 6. Perform good housekeeping. Safety precautions
Always wear eye protection and protective clothing or gear, as appropriate. Do not work alone - in the event of an emergency another person's presence may be essential. Always keep one hand in your pocket when anywhere around a powered line connected or high voltage system.
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Assessment Criteria Workmanship Accuracy of Testing Use of Tools and Instruments Use of PPE Speed Housekeeping TOTAL
5 pts. 4 pts. 3 pts. 3 pts. 3 pts. 2 pts. 20 pts.
OPERATION SHEET 2.5 TESTING THE EARTH RESISTANCE Tools and Equipment
Laboratory circuit board Earth resistance tester Screwdriver Side cutting pliers Combination pliers Personal protective equipment - gloves - goggles
Procedure Prepare tools, materials and equipment needed. Wear appropriate PPE Before proceeding with measurement, if the “ “ symbol appears on the display, replace with new batteries. 4. Short the tips of the leads. Adjust the 0Ω ADJ control to set the reading to zero. 5. Rotate the function switch to the “EARTH VOLTAGE” position and press to test. Earth voltage will be displayed on the LCD. If earth voltage is more than 10V, an inaccurate reading may be obtained. 6. Precision earth resistance measurement method: Connect the green, yellow and red test leads to instrument terminals E, P and C with auxiliary earth spikes P1, C1 placed into the soil “IN A STRAIGHT LINE”. (Fig. 1) Rotate the function switch to a suitable range then press the push button to test and take the reading. 7. Simplified earth resistance measurement method: This method is recommended where an earth resistance higher than 10Ω is measured or where it is not possible to drive auxiliary earth spikes. An approximate value of earth resistance can be obtained by the two wire system shown in Fig. 2. Rotate the function switch to “EARTH VOLTAGE” position and press to test. Make certain that earth voltage is less than 10V. 1. 2. 3.
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8. 9.
First rotate the function switch to the “200Ω position and press to test. Read earth resistance. If the display shows “1”, switch to the “2KΩ” position and read earth resistance. The reading obtained (Rx) is an approximate earth resistance value. There is no need for external shorting as P and C terminals are shorted by using the test leads specified for the simplified measurement. Record the data you have gathered. Perform good housekeeping.
Figure 3 (above). Earth resistance tester Figure 4 (right). Earth resistance tester lead terminal
Caution To protect yourself, think “Safety First”. Voltages exceeding 30VAC or 60VDC pose a shock hazard so use caution. Use appropriate personal protective equipment such as safety glasses, face shields, insulating gloves, insulating boots, and/or insulating mats. Never ground yourself when taking electrical measurements. Always work with a partner. When using the probes, keep fingers as far behind the probe tips as possible. Assessment Criteria Workmanship Accuracy of Testing Use of Tools and Equipments Use of PPE Speed Housekeeping TOTAL
5 pts. 4 pts. 3 pts. 3 pts. 3 pts. 2 pts. 20 pts.
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OPERATION SHEET 2.6 TESTING PHASE SEQUENCE Tools and Equipment Laboratory circuit board Phase sequence tester Screwdriver Side cutting pliers Combination pliers Personal protective equipment - gloves - goggles Procedure 1. Prepare tools, materials and equipment needed. 2. Wear appropriate PPE. 3. Connect the tester to the circuit under test. 4. Check for voltage on all phases: three LEDs marked “A”, “B” & “C” should be on. If there is a lack of voltage on one of the test leads the corresponding LED will not illuminate. If a voltage is present on one or two leads and the remaining leads are connected to neutral or ground, both or all LEDs will illuminate not including the phase sequence LEDs. 5. If the voltages of all phases are correct it is possible to read out the phases’ order by observing the illumination of the LED marked as “NORMAL (ABC)” or “REVERSE”. 6. After conducting a test, the instrument should be disconnected from the circuit under test. The tester left under voltage for long periods of time can overheat. In such a case the built-in thermal protection will disconnect the electronic system and the indications will be switched off. If such a situation occurs, you should disconnect the tester from the installation and wait a few minutes before another use of the tester (the tester will run automatically after cooling down). 7. Record the data you have gathered. 8. Perform good housekeeping.
Figure 5. Phase sequence tester
Figure 6. Actual testing of phase sequence
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Caution Do not test any circuits in the extremely humid or wet environment.
After transferring the tester from a cold place into a warm one, please, wait about 30 min. to get the tester acclimated to the present conditions. You can wipe the condensed dew, if necessary. Do not operate the meter in the environment with explosive gas (material), combustible gas (material), steam or filled with dust. Insulate yourself from the objects being measured. Do not make contact with any exposed metal (conductive) parts such as the tips of the test leads, sockets, fixing objects, circuits, etc. Do not conduct any measurements if the tester is defective, with the defective casing or test leads (breakages, deformations, fractures, contaminations, etc).
Assessment Criteria Workmanship Accuracy of Testing Use of Tools and Instruments Use of PPE Speed Housekeeping TOTAL
5 pts. 4 pts. 3 pts. 3 pts. 3 pts. 2 pts. 20 pts.
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Program/Course:
BUILDING WIRING INSTALLATION NC II
Unit of Competency:
COMMISSION INSTALLED ELECTRICAL SYSTEM
Module Title:
Commissioning Electrical System
Learning Outcome 3: Finalize commissioning activities Assessment Criteria 1. 2. 3. 4.
Defects are remedied or repaired following prescribed procedure. Work reports are prepared in line with established policies. Workplace is cleaned up and made safe in line with established policies. Tools, equipment and surplus materials are cleaned, checked and stored in line with established procedure. 5. Final testing is undertaken in line with established procedures. References: 1.
Institute of Integrated Electrical Engineers of the Philippines Incorporated. Philippine Electrical Code of 1992.
2.
Max B. Fajardo Jr. & Leo R. Fajardo. Electrical Layout and Estimate, 2nd Edition.
3.
Azares, Efren F. and Recana, Cirilo B. Publishing: 1999.
4.
Roland E. Palmquist. Audel House Wiring, 7th Edition.
5.
www.des.od.nih.gov/eWebb/…/commissioning/nih_cxguide/cxspecs/1699 555k
6.
www.epa.gov/rtp/new-bldg/environmental/0910updf
7.
www.megger.com/au/products
8.
www.omnicontrols.com/manufacturer.megger.aspx
9.
www.amprove.com/manuals/PRMZ-pdf
Practical Electricity III; Adriana
10. www.wikihow.com/use-a-multimeter 11. www.acmehowto.com/howto/maintenance/electrical/onthevoltage.htm
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LEARNING EXPERIENCES/ACTIVITIES Learning Outcome 3: Finalize commissioning activities Learning Activities 2. Read the attached Information Sheet 2.1 on the: things to consider in final testing of electrical circuit accountability in declaring system as commissioned. final activities in commissioning process.
Special Instructions You can ask the assistance of your teacher to show you and explain further topics you cannot understand.
3. Answer Self-Check 2.1 to test your knowledge on the things to consider in final testing of electrical circuit. 4. Compare your answer to answer key 2.1. 5. Answer Activity Sheet 2.1 on Commissioning Grounded Fluorescent and Fixture
INFORMATION SHEET 3.1 THINGS TO CONSIDER IN FINAL COMMISSIONING ACTIVITIES In electrical system, there are several electrical circuit defects to be considered. These include an open circuit, short circuit and grounded circuit. These factors should be considered in the final testing of the electrical components/circuits. Remember that the purpose of electric systems commissioning is to increase the reliability of electric power system after installation by identifying problems and providing a et of baseline values for comparison with subsequent routine tests. A procedure should be developed in the form of commissioning plan.
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COMMISSIONING PLAN Procedures 1. Verify the installation of all equipment/components. 2. Understand the equipment moods of operation. 3. Test the equipment. Consider the following factors in testing: Operation Safety requirements Note: When problems arise during testing of the equipment and system, then troubleshooting techniques should be performed. Basic Electrical Troubleshooting 1. Gathering information is a logical first step in any troubleshooting endeavor. Guide questions: What technical documentation about the equipment is available? How exactly is the equipment supposed to operate? 2. Understanding the malfunction means that you understand how or what the process is and what portion of the process is operating incorrectly. Guide questions: How is the process supposed to work? What is not functioning as it should? 3. Identifying which parameters need to evaluated. Guide questions: How is the process supposed to work? What is not functioning as it should? 4. Identifying the source of the problem requires the technician to Isolate components and evaluate circuit parameters. Identify the malfunctioning component using the recorded data. 5. Correcting / repairing the component identified as damaged based on the recorded data. 6. Verifying the repair after completion. Ensure the equipment is operating as designed. 7. Performing root cause analysis.
SELF-CHECK 3.1 Direction: Answer the following questions: 1. In troubleshooting electrical circuit, where are you going to base your repair? 2. What do we need to consider in testing electrical component?
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ACTIVITY SHEET 3.1 COMMISSIONING GROUNDED FLUORESCENT FIXTURE Direction: The students will be given a grounded fluorescent fixture. The teacher will observe them if they have followed the correct procedure in commissioning and also by supplying the needed information written below. Write your answer on a separate sheet of paper. Guide question: 1. When was this fluorescent lamp bought? 2. What will happen to the lamp once you turn on the switch? 3. What test instrument is needed?
Table 1 Symptoms
Cause
Remedial Measure
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ASSESSMENT PLAN Program/Course:
BUILDING WIRING INSTALLATION NC II
Unit of Competency:
COMMISSION INSTALLED ELECTRICAL SYSTEM
Module Title:
Commissioning Electrical System
Work Sample
Written Test*
Oral Questioning*
Observation
Assessment Criteria
Demonstration
Assessment Methods
LO 1. Perform preliminary activities for commissioning 1. Scope of work is confirmed to ensure clear understanding of job elements. 2. Planning of commissioning activity is performed in line with work requirements. 3. Materials, tools and equipment needed for commissioning are prepared according to work requirements. LO 2. Perform testing of electrical system 1. Continuity of circuit is measured following prescribed procedure. 2. Insulation resistance is performed following prescribed procedure. 3. Supply voltage is measured following prescribed procedure. 4. Earth resistance test is performed following prescribed procedure. 5. Phase sequence testing is performed following prescribed procedure. LO 3. Finalize commissioning activities 1. Defects are remedied or repaired following prescribed procedure. 2. Work reports are prepared in line with established policies. 3. Workplace is cleaned and made safe in line with established policies. 4. Tools, equipment and surplus materials are cleaned, checked and stored in line with established procedure. 5. Final testing is undertaken in line with established procedures.
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Observation Checklist Student’s name: Teacher’s name: Name of School: Competency standards Unit of competency: Instructions for the assessor: 1. Observe the student [insert description of activity being observed]. 2. Describe the assessment activity and the date on which it was undertaken. 3. Place a tick in the box to show that the student completed each aspect of the activity to the standard expected in the enterprise. 4. Complete the feedback sections of the form. Date of observation Description of assessment activity Location of assessment activity The student….
If yes, tick the box
can
Did the student’s overall performance meet the standard?
Yes
No
Feedback to student: Teacher’s signature:
Date:
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Observation and Questioning Checklist Student’s name: Teacher’s name: Name of School: Competency standards Unit of competency: Instructions for the teacher: 1. Observe the student [insert description of activity being observed]. 2. Describe the assessment activity and the date on which it was undertaken. 3. Place a tick in the box to show that the student completed each aspect of the activity to the standard expected in the enterprise. 4. Ask the student a selection of the questions from the attached list to confirm his/her underpinning knowledge 5. Place a tick in the box to show that the student answered the questions correctly. 6. Complete the feedback sections of the form. Date of observation Description of assessment activity Location of assessment activity The student…. can
If yes, tick the box
Did the student’s overall performance meet the standard?
Yes
No
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Demonstration Student’s name: Teacher’s name: Unit of competency: Competency standards: Date of assessment: Time of assessment: Instructions for demonstration Given the necessary materials the student must be able to:
Materials and equipment:
to show if evidence is demonstrated
During the demonstration of skills, did the student:
Yes
No
N/A
The student’s demonstration was: Satisfactory
Not Satisfactory
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Written report Student’s name: Teacher’s name: Name of School: Competency standards Unit of competency: Task: Your task is to: [insert description of task] Submission date: Use the checklist below as a basis for judging whether the student’s report meets the required competency standards. The student’s report….
If yes, tick the box
Overall did the student’s report meet the standard?
Yes
No
Comments:
Student’s signature:
Date:
Teacher’s signature:
Date:
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PERFORMANCE TEST Student's Name
Date
Competency:
Directions: CALL TEACHER, ask teacher to assess your performance in the following critical task and performance criteria below
Test Attempt 1st 2nd 3rd OVERALL EVALUATION Level Achieved
You will be rated based on the overall evaluation on the right side.
PERFORMANCE LEVELS
4 - Can perform this skill without supervision and with initiative and adaptability to problem situations. 3 - Can perform this skill satisfactorily without assistance or supervision. 2 - Can perform this skill satisfactorily but requires some assistance and/or supervision. 1 - Can perform parts of this skill satisfactorily, but requires considerable assistance and/or supervision. Teacher will initial level achieved.
PERFORMANCE STANDARDS For acceptable achievement, all items should receive a "Yes" or "N/A" response.
Yes
No
N/A
Get from Performance criteria of the module
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ANSWER KEY 1.1 A. Direction: Enumerate the following 1-12. Scope of commissioning electrical system 1. Secondary Service Electrical Systems 2. Motor Control Centers 3. Distribution and Branch circuit panelboards 4. Lighting Fixtures and Controls 5. Lightning Protection Equipment and Lightning Protection Systems 6. Equipment Monitoring 7. Fire Alarm Equipment/Fire Alarm Equipment Monitoring System 8. AC motors 9. Grounding Equipment and Building Grounding System 10. Security System 11. Emergency Generators and Distribution System 12. Uninterruptible Power Systems 13-18. Work included in commissioning process 13. Systems and equipment testing and start-up. 14. Validation of proper and thorough installation of Division 16 systems and equipment 15. Equipment performance verification. 16. Functional testing of electrical systems. 17. Documentation of tests, procedures, and installations. 18. Coordination of training B. Direction: Identify the word or words being referred to by the statement, write the answer on your answer sheet. High potential tester 1. It is a device used to verify the electrical insulation in a cable, printed circuit board, electric motor, transformer or other wired assembly. Phase sequence tester 2. It is used to assure proper and safe connection of the electrical equipment on three-phase systems. Megger
3. It is an instrument used to measure the insulation resistance of conductors or wire.
Multitester
4. It is used to measure either, the voltage, the resistance or the current of a circuit.
ANSWER KEY 3.1 Direction: Answer the following questions: 1. In troubleshooting electrical circuit, where are you going to base your repair? Recorded date 2. What do we need to consider in testing electrical component? Operation of the component and safety requirements
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