PEC QC With Answer

Chapter 1 General 1. A general term including material, fittings, devices, appliances, fixtures, apparatus, and the like used as part of, or in connection with, an electrical installation is ____. a. premises wiring (system) c. utilization equipment b. service equipment d. equipment 2. A switch intended for use in general distribution and branch circuits. It is rated in amperes, and it is capable of interrupting its rated current at its rated voltage, is a ____ switch. a. bypass isolation b. general use c. isolating d. transfer 3. The permanent joining of metallic parts to form an electrically conductive path that will ensure electrical continuity and the capacity to conduct safely any current likely to be imposed is known as _____. a. ordinary tap joint b. scarf joint c. britannia joint d. bonding 4. A circuit breaker that has purposely introduced into a delay in the tripping action and which delay decreases as the magnitude of the current increases is a ____ circuit breaker. a. inverse time b. adjustable c. control vented d. vented power 5. A switch intended for isolating an electric circuit from the source of power that thas no interrupting rating, and it is intended to be operated only after the circuit has been opened by some other means is a/an _____. a. isolating switch c. general-use switch b. bypass isolation switch d. transfer switch 6. Not readily accessible to persons unless special means for access are used is _____. a. elevated b. guarded c. isolated d. listed 7. The definition of ampacity is _____. a. the current-carrying capacity of conductors expressed in volt-amps b. the current-carrying capacity expressed in amperes c. the current-carrying capacity of conductors expressed in wattage d. the current in amperes a conductor can carry continuously under the conditions of use without exceeding its temperature rating. 8. The definition of ambient temperature is _____. a. the temperature of the conductor b. the insulation rating of the conductor c. the temperature of the area surrounding the conductor d. the maximum heat the insulation can be used within 9. Type of service where both the load and the time intervals may have wide variations. a. Continuous b. Periodic c. Intermittent d. Varying 10. Special permission is _____. a. granted by the electrical foreman on the job b. verbal permission by the inspector c. given only once on one blueprint change request d. the written consent of the authority having jurisdiction

11. An overcurrent protective device with a circuit opening fusible part that is heated and severed by passage of overcurrent through it is called _____. a. current-limiter b. fuse c. circuit breaker d. thermal overload 12. The service conductors between the terminals of the service equipment and a point usually outside the building, clear of building walls, where joined by tap or splice to the service drop is called _____. a. service drop b. service-entrance c. service equipment d. none of these 13. A dwelling unit is _____. a. one unit of an apartment b. one or more rooms used by one or more persons c. one or more rooms with space for eating, living and sleeping d. one or more rooms used as a housekeeping unit and having permanent cooking and sanitation provisions 14. Where the conductor material is not specified in the Code, the conductors are assumed to be _____. a. bus bars b. aluminum c. copper-clad aluminum d. copper 15. Mandatory rules of the Code are identified by the use of the word _____. a. should b. shall c. must d. could 16. Continuous duty is _____. a. a load where the maximum current is expected to continue for three hours or more b. a load where the maximum current is expected to continue for one hour or more c. intermittent operation in which the load conditions are regularly recurrent d. operation at a substantially constant load for an indefinitely long time 17. An enclosure designed either for surface or flush mounting and provided with a frame, mat or trim in which a swinging door or doors are or may be hung is _____. a. cabinet b. panelboard c. cutout box d. switchboard 18. All wiring must be installed so that when completed _____. a. it meets the current-carrying requirements of the load b. it is free of shorts and unintentional grounds c. it is acceptable to the Code compliance authorities d. it will withstand a hy-pot test 19. So constructed or protected that exposure to the weather will not interfere with successful operation defined the _____. a. Weatherprooof b. Weather tight c. Weather resistant d. All weather 20. The current-carrying capacity of conductors expressed in amperes is _____. a. demand b. pressure c. ampacity d. duty-cycle

Philippine Electrical Code Part 1 Chapter 2 – Service 1. Service drop conductors not in excess of 600 volts shall have a minimum clearance of ____ mm over residential property and driveways, and those commercial areas not subject to truck traffic.(PEC 2009, 2.30.2.4(b)) a. 3000 b. 3600 c. 4500 d. 5500 2. Service overhead conductors to a building or other structure (such as pole) on which a meter of disconnecting means is installed shall be considered as a _____ and installed accordingly. (PEC 2000, 2.30.2.1) a. temporary service b. service lateral c. service drop d. service point 3. Service raceways shall be equipped with a _____ service head at the point of connection to service-drop conductors. (PEC 2009, 2.30.4.15) a. raintight b. weatherproof c. rainproof d. watertight 4. A circuit breaker with a trip setting of not more than ____ times the ampacity of conductor shall be considered as to provide the required short circuit protection. (PEC 2009, 2.30.8.9) a. 3 b. 4 c. 5 d. 6 5. A fuse rated in continuous amperes not to exceed ____ times the ampacity of conductor shall be considered as to provide the required short circuit protection. (PEC 2009, 2.30.8.9) a. 3 b. 4 c. 5 d. 6 6. Service conductors passing over roofs must have a clearance over the roof which they pass of is _____. (PEC 2009, 2.30.2.4(a)) a. 2000 mm b. 2400 mm c. 1500 mm d. 1000 mm 7. Service entrance conductors shall have sufficient capacity and shall NOT be smaller than _____. (PEC 2009, 2.30.4.3) a. 100 % of the load to be served b. the load increased to 125% c. 80 % of the load to be served d. 125 % of the continuous load plus 100 % of the non-continuous load 8. Service conductors in cable shall NOT be smaller than ______. a. 3.5 mm2 c. 5.5 mm2 b. 8.0 mm2 d. 14.0 mm2 9. Using aluminum or copper clad aluminum conductors, the minimum size of service entrance conductors shall be ______. a. 3.5 mm2 c. 5.5 mm2 2 b. 8.0 mm d. 14.0 mm2 10. What is the maximum allowable voltage drop from the main circuit breaker to the farthest lamp load? a. 10 percent c. 2 percent b. 5 percent d. 3 percent

PEC Chapter 2 Branch Circuit and Feeder Calculation 1. In a residence, no point along the floor line in any wall space be more than _______ mm from an outlet. ( PEC 2.10.3.3 (a) (1) ) a. 1800 b. 1920 c. 3600 d. 3000 2. The lighting load for a dwelling unit expressed in terms of volt-ampere per sq. meter must be at least _________. (PEC Table 2.20.2.3) a. 16 b. 28 c. 24 d. 12 e. 3. What is the volt-amp for lighting of an office building with 500 sq- meters area? Times 28 (PEC Table 2.20.2.3) a. 13000 b. 14000 c. 15000 d. 16000 4. In dwelling units , at least one wall receptacle outlet shall be installed within _________mm of the outside edge basin or bath tub. a. 600 mm b. 900 mm c. 1200 mm d. 1600 mm 5. Calculate the total load for a 1-phase, 230 Volt branch circuit supplying two – 3kW and two 4kW wall mounted oven. (PEC Table 2.20.3.16) a. 34.4 b. 42.2 c. 48.7 d. 60.9 6. Where a _________ supplies continuous loads or any combination of continuous and non-continuous loads, the rating of the overcurrent device shall not be less than the non-continuous load plus 125 % of the continuous load. (PEC 2.10.2.2 (a)) a. load b. conductor c. demand d. branch circuit 7. Outlets for specific appliances such as laundry equipment, shall be within _____ of the appliance. (PEC 2.10.3.1) a. 1800 mm b. 1200 mm c. 1600 mm d. 2200 mm

8. Portable appliance used on 15 or 20 Amp branch circuits, the rating of any one portable appliance shall not exceed _______ of the branch circuit rating ( PEC 2.10.2.5a) a. 70 % b. 80 % c. 100 % d. 150 % 9. Where receptacles are connected to a 20A branch circuit, the maximum allowable cord and plug connected load shall not be more than _________ Amperes. a. 16 b. 20 c. 14 d. 18 10. Branch circuit conductors shall have an ampacity not less than ________. (PEC 2.10.2.1) a. the load increased 125 % b. 100 % of the load to be served c. 80 % of the load to be served d. 125 % of the continous load plus 80 % of the non-continous load 11. An insulated grounded conductor of 14mm2 or smaller shall be identified by a continuous _________ outer finish along its entire length. (PEC2.0.1.6 p.61) a. green b. black c. green with yellow stripes d. white or natural

PEC Chapter 2 Overcurrent Protection 1. The following are the standard ampere rating of a breaker which one is NOT? (PEC 2.40.1.6 ) a. 40 c. 50 b. 45 d. 55 2. It is a device that when an interrupting currents in its current limiting range, will reduce the current flowing in the faulted circuit to a magnitude substantially less than that obtainable in the same circuit if the device were replaced with a solid conductor having comparable impedance. ( PEC 2.40.1.11 ) a. Current – Limiting Overcurrent Protective Device b. Ground Fault Protection of Equipment c. Electrical System Coordination d. Supplementary Overcurrent Protection 3. A fuse or an overcurrent trip unit of a circuit breaker shall be connected in __________ with each ungrounded conductor. (PEC 2.40.2.1 (a) ) a. Series c. Either a or b b. Parallel d. None of the above 4. Enclosures for overcurrent devices shall be mounted in a _____ position unless in individual instances this is shown to be impracticable and is installed in accordance with 2.40.33 (PEC 2.40.33) a. Horizontal c. open b. Diagonal d. vertical 5. An overcurrent trip unit of a circuit breaker shall be connected in series with each___. (PEC 2.40.2.1) a. Ungrounded conductor c. Overcurrent Device b. Grounded conductor d. Transformer 6. Fuses and circuit breakers shall be located or __________ so that the persons will not be burned or otherwise injured by their operation. ( PEC 2.40.4.2 (a) ) a. Protected c. Shielded b. Guarded d. None of the above c. 7. Every circuit breakers having an interrupting rating other than _________ amperes shall have its interrupting rating shown on the circuit breaker. ( PEC 2.40.7.4(c)) a. 2000 c. 4000 b. 3000 d. 5000 8. The rating of the largest size regular plug fuse is _________ amperes. ( PEC 2.40.5.2 ) a. 15 c. 30 b. 20 d. 60 9. The neutral conductor shall not be _________. ( PEC 2.40.2.3) a. stranded c. insulated b. solid d. fused 10. PEC requires that the resistance to ground of a single electrode consisting of rod, pipe or plate shall be……( PEC 2.50.3.7 ) a. 30 to 50 ohms c. above 100 ohms b. 25 ohms or less d. 50 to 100 ohms

11. What is the minimum size of grounding electrode copper conductor (PEC 2.50.3.17 ) a. 3.5 sq.mm c. 8.0 sq.mm b. 5.5 sq.mm d. 14 sq.mm 12. The ground ring shall be buried at a depth below the earth surface of not less than_______. (PEC 2.50.3.1(d)) a. 600 mm c. 900 mm b. 750 mm d. 1000 mm c. Philippine Electrical Code Part 1 Chapter 3 – Wiring Methods and Materials 1. The conductor with the highest insulation temperature rating is________. (PEC Table 3.10.1.13) a. THWN c. RHH b. RH d. THW 2. Ferrous raceways and fittings do not need to be suitably protected against corrosion when installed in areas where ________ exist. (PEC 3.0.1.6 (a)) a. Acid chemicals c. Fertilizer b. Alkali chemicals d. Different temperatures 3. The minimum cover requirement for rigid nonmetallic conduit without concrete encasement is __________ mm.(PEC Table 3.0.2.20) a. 150 c. 450 b. 300 d. 600 4. When derating the ampacity of multiconductor cables to be installed in cable tray , the ampacity deration shall be based on ______. ( PEC 3.18.1.11 b ) I. the total number of current carrying conductors in the cable tray. II. the total number of current carrying conductors in the cable . a. I only c. Either I or II b. II only d. Both I and II 5. Concrete, brick or tile walls are considered as being . ( PEC 3.0.1.6 b) a. Isolated c. Grounded b. Insulators. D. Dry Locations 6. Is it permissible to install direct current and alternating current conductors in the same outlet box . ( PEC 3.0.1.3 c1) a. Yes, if insulated for the maximum voltage of any conductor b. No, never c. Yes, if the ampacity is the same for booth conductors d. Yes, in dry places 7. The neutral conductor _________. ( PEC 3.10.1.15 b4 ) a. Is always the white grounded conductor b. Has 70 % applied for a household clothes dryer for a branch circuit c. Never apply ampacity corrections d. Carries the unbalance current

8. Installing more than three current carrying conductors in the same conduit requires _________. ( PEC 3.10.15.b 2 a ) a. A larger conduit c. Derating Ampacity b. High heat rated conductors d. Continuous loading 9. The Code rule for maximum 90 degree bends in a conduit between two boxes is four, the most likely reason for the total 360 degree limitation is ( PEC 3.50.2.7 ) a. It is unsafe b. It makes pulling the conductors through the conduit too difficult c. You can damaged the galvanized coating on the conduit d. Too many bends require extra wire to be pulled 10. The total load on any overcurrent device located in a panelboard shall not exceed _______ of its rating where in normal operation the load will continue for 3 hours or more ( PEC 3.84.3.4(d) ) a. 80 % c. 70 % b. 125 % d. 50% 11. Two metals of different materials shall not be joined together in order to avoid the _________ action ( PEC 3.46.1.3 ) a. rusting c. reverse b. galvanic d. corrosion 12. What is the maximum number of overcurrent devices allowed in a lighting and appliance panelboard ( PEC 3.84.3.3 ) a. 24 c. 36 b. 30 d. 42 13. Copper – clad aluminum conductors have an ampacity ____. a. Lower than copper but higher than aluminum b. Equal to copper c. Rating of their own d. Equal to aluminum

( PEC T.3.10.1.16 )

14. The conductor with the highest insulation temperature rating is___. a. RH c. THWN b. TW d. THHN

( PEC 3.10.1.16 )

15. On an insulated conductor the type letter “TW” indicates______.( PEC T 3.10.1.13 ) a. Tie - wire b. Thermoplastic – moisture resistant c. Thermoplastic – waterproof d. Thermal - with nylon 16. When the rigid metallic conduit are buried the minimum cover required by the code .( PEC 3.0.1.5 ) a. 150 mm c. 480 mm b. 300 mm d. 600 mm 17. The underground clearance for approved direct buried cable ? (PEC 3.0.1.5) a. 600 mm c. 450 mm b. 150 mm d. 500 mm

18. Which of the following conductor sizes has the highest resistance? a. 2.0 mm2 c. 5.5 mm2 b. 3.5 mm2 d. 8.0 mm2 19. What is the temperature rating of THW insulation? a. 60 degree celcius c. 85 degree celcius b. 75 degree celcius d. 90 degree celcius 20. What is the temperature rating of THHN insulation? a. 60 degree celcius c. 85 degree celcius b. 75 degree celcius d. 90 degree celcius Philippine Electrical Code Part 1 Chapter 4 – Equipment for General Use 1. Conductors and busbars shall be located so as to be free from __________and shall be held firmly in place. (PEC 4.8.1.3 (1) ) a. Physical Damage c. Biological Damage b. Chemical Damage d. None of these 2. Minimum Spacing between bottom of enclosure and busbars , their supports or other obstructions. (250 mm) ( PEC T4.8.1.5 ) a. 150 mm b. 250 mm c. 275 mm d. 300 mm 3. For other than a totally enclosed switchboard, a space not less than ______ shall be provided between the top of the switchboard and any combustible ceiling, unless a noncombustible shield is provided between the switchboard and the ceiling. (4.8.2.3) a. 800 mm b. 900 mm c. 1000 mm d. 1100 mm 4. A lighting and appliance branch – circuit panelboard is one having more than _______ of its overcurrent devices protecting lighting and appliance branch circuits. (PEC 4.8.3.5 a) a. 15 percent b. 12.5 percent c. 10 percent d. 8 percent 5. Maximum number of overcurrent device in a panelboard . (PEC 4.8.3.6) a. 36 b. 37 c. 42 d. 34 6. A power panelboard is one having _______ or fewer of its overcurrent devices protecting lighting and appliance branch circuits. (PEC 4.8.3.5 b) a. 15 percent b. 12.5 percent c. 10 percent d. 8 percent 7. Panelboards shall be durably marked by the manufacture with the following except one(PEC 4.8.3.1) a. Voltage b. Current c. Phase d. Power 8. The ampacity of capacitor circuit conductors shall not be less than _________of the rated current of the capacitor. (PEC 4.60.1.8 a) a. 135 percent b. 120 percent c. 80 percent d. 125 percent

9. A type of transformer shall be provided with a noncombustible moisture-resistant case or enclosure that provides protection against the accidental insertion of foreign objects. (4.50.1 b) a. Instrument Transformer c. Power Transformer b. Dry-Type Transformer d. Distribution Transformer 10. Capacitors shall be permitted to be protected ________. (PEC 4.60.2.2 c ) a. Individually b. Group c. Both a and b d. none of these Philippine Electrical Code Part 1 Chapter 5 – Special Occupancies 1. Locations which are hazardous because of the presence of combustible dust. ( PEC 5.0.1.5 (c) 1 A ) a. class I b. class II c. class III d. class IV 2. Hazardous locations where combustible dust is not normally in the air in quantities sufficient to provide explosive or ignitable mixtures, and dust accumulations are normally insufficient with the normal operation of electrical equipment. a. class II, division 1 c. class III, division 1 b. class II, division 2 d. class III, division 2 3. Hazardous locations in which easily ignitable fibers or material producing combustible flying are handled, manufactured or used. a. class III, division 1 c. class I, division 1 b. class IIII, division 2 d. class I, division 2 4. Hazardous location which ignitable concentrations of flammable gases or vapors can exist under normal operating conditions. a. class II, division 1 c. class I, division 1 b. class II, division 2 d. class I, division 2 5. Locations which are hazardous because of the presence of easily ignitable fibers of flyings. a. Class I b. Class II c. Class III d. Class IV 6. Explosion hazards exist due to the presence of the following material EXCEPT one. Which one is this? a. combustible dust c. flammable liquids b. flammable vapors d. carbon dioxide gas 7

Hazardous locations, in which volatile flammable liquids or flammable gases are handled, processed or used. a. Class I, Division 2 c. Class II, Division 1 b. Class II, Division 2 d. Class I, Division 1

8. Hazardous locations are classified by the Philippines Electrical Code in how many classes? a. Two classes b. Four classes c. Three classes d. One class 9. Hazardous location in which flammable gases or vapors are present in the air in quantities sufficient to produce explosives or ignitable mixtures.

a. class II

b. class III

c.

class IV

d.

class I

10. Hazardous location in which easily ignitable fibers are stored and handled. a. Class III, Division 2 c. Class II, Division 2 b. Class III, Division 1 d. Class II, Division 1 11. Hazardous locations in which combustible dust is in the air under normal operating conditions in quantities sufficient to produce explosive or ignitable mixtures. ( PEC 5.0.1.5 (c) 1 A ) a. Class II, Division 1 c. Class III, Division 1 b. Class II, Division 2 d. Class III, Division 2 12. A protection technique utilizing stationary gas detectors in industrial establishments ( PEC 5.0.1.2 Definitions ) a. Hermetically Sealed c. Dust Ignition Proof b. Combustible Gas Detection System d. Dust tight 13. Equipment Sealed against the entrance of an external atmosphere where the seal is made by fusion. ( PEC 5.0.1.2 Definitions ) a. Hermetically Sealed c. Dust Ignition Proof b. Combustible Gas Detection System d. Dust tight 14. A motor enclosure designed and constructed to contains sparks or flashes that may ignite surrounding gas or vapor is called. ( PEC 5.0.1.4 a ) a. Non – ventilated b. Encapsulated c. Explosion Proof d. Water Cooled 15. What is a __________ atmosphere in a hazardous locations one contains acetylene. a. Group A b. Group B c. Group C d. Group D