Electrical Workshop Manual

VISAT

EEE Dept

Expt No:1(a) Date:

ONE LAMP CONTROLLED BY ONE SWITCH Aim To wire up a circuit to control one lamp controlled by one switch.

Materials required Sl No 1 2 3 4 5 6 7 8 9

Materials

10

One way switch Batten Lamp holder MCB,DP Switch Box Round Block PVC Conduit 3Way Junction Box Saddles PVC insulated flexible Cu wire Screws

11 12 13

Incandascent lamp Wiring board PVC Tee

Specification 6A,250v 6A,250v 16A,240v PVC 5*7cm PVC 70mm 20mm dia 20mm dia 20mm dia 1.5mm2 38mm 20mm 13mm 250v,40W 3’*2’ 20mm dia

quantity 1 1 1 1 1 60cm 1 6 160cm 1 4 14 1 1 1

Procedure 1. Draw the wiring diagram and lay out and get them approved by staff in charge. 2. Prepare the list of tools and materials required for the work and collect them. 3. Cut the conduit into required length and draw wires of respective colours through the conduit. 4. Connect the conduit with suitable interconnecting materials as per the layout and fix them on wiring board properly with correct size of clamps and screws.

Electrical Workshop

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VISAT

EEE Dept

Wiring Diagram

All dimensions are in cm

20 cm

Layout Diagram

20 cm

20 cm

All dimensions are in cm

5. Take out the wire terminals through switch box and round block.

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EEE Dept

6. Fix the accessories such as fuse unit, neutral link switch and lamp holder as per the diagram. 7. Verify the connections and switch on the supply for testing.

Precautions 1. Avoid loose contacts and cuttings on conductors and wire. 2. Do not over tight the wires. 3. Never need over rated fuse wire inside the fuse units.

Result The circuit was wired up to control one lamp by one switch and verified.

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VISAT

EEE Dept

Expt No:1(b) Date:

CONTROL OF TWO LAMPS IN SERIES AND PARALLEL Aim To connect two lamps in series and parallel and to prepare an estimate for the same.

Materials required Sl No 1 2 3 4 5 6 7 8 9 10 11 12 13 14

Material One way distribution metal and led type neutral link PVC conduit MCB, DP Two way switch PVC Switch box Junction box Junction box Junction box Steady batten lamp holder GI Saddle Bulb PVC bend PVC insulated multistranded flexible Cu wire Screw

Specification

Quantity 1

20mm 250V,16A, 250V,5A ,piano 5x7cm 20mm,3way 20mm,4way 20mm,1way 6A,250V 20mm 250V,60W 20mm

1.2m 1 2 2 1 1 2 2 12 2 1

1.5 mm2,1100V 38mm 13mm 20mm

3.8m 3 14 8

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VISAT

EEE Dept

Wiring Diagram

All dimensions are in cm Layout Diagram

All dimensions are in cm

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VISAT

EEE Dept

Procedure 1. Draw the wiring diagram and lay out and get them approved by staff in charge. 2. Prepare the list of tools and materials required for the work and collect them. 3. Cut the conduit into required length and draw wires of respective colour through the conduit. 4. Connect the conduit with suitable interconnecting materials as per the layout and fix them on wiring board properly with correct size of clamps and screws. 5. Take out the wire terminals through switch box and round block. 6. Fix the accessories such as fuse unit, neutral link switch and lamp holder as per the diagram. 7. Verify the connections and switch on the supply for testing.

Switching operations S1 C-2 C-1 C-1 C-2

S2 C-2 C-1 C-2 C-1

L1 Dim Bright Bright Dark

L2 Dim Bright Dark Dark

Precautions 1. Avoid loose contacts and cuttings on conductors and wire. 2. Do not over tight the wires. 3. Never need over rated fuse wire inside the fuse units.

Result The circuit for two lamps by two switches was wired up and tested .

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VISAT

EEE Dept

Expt No:2 Date:

STAIR CASE WIRING Aim Two wire up a circuit to control one lamp by two switches.

Materials Required Sl No 1 2 3 4 5 6 7 8 9

Materials

10

Two way switch Batten Lamp holder] MCB,DP Switch Box Round Block PVC Conduit 3Way Junction Box Saddles PVC insulated flexible Cu wire Screws

11 12

Incandascent lamp PVC Tee

Specification

6A,250v 6A,250v 16A,250V PVC 5*7 PVC 70mm 20mm dia 20mm dia 20mm dia 1.5mm2 38mm 20mm 13mm 250v,40W 20mm dia

quantity

2 1 2 1 120cm 2 6 420cm 1 6 14 1 1 1

Procedure 1. Draw the wiring diagram and lay out and get them approved by staff in charge. 2. Prepare the list of tools and materials required for the work and collect them. 3. Cut the conduit into required length and draw wires of respective colourthrough the conduit. 4. Connect the conduit with suitable interconnecting materials as per the layout and fix them on wiring board properly with correct size of clamps and screws. 5. Take out the wire terminals through switch box and round block.

Electrical Workshop

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VISAT

EEE Dept

Wiring Diagram

All dimensions are in cm Layout Diagram

All dimensions are in cm

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VISAT

EEE Dept

6. Fix the accessories such as fuse unit, neutral link switch and lamp holder as per the diagram. 7. Verify the connections and switch on the supply for testing.

Precautions 1. Avoid loose contacts and cuttings on conductors and wire. 2. Do not over tight the wires. 3. Never need over rated fuse wire inside the fuse units.

Result The circuit for one lamp by two switches was performed and tested.

Electrical Workshop

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VISAT

EEE Dept

Expt No:3 Date:

GODOWN WIRING SYSTEM Aim To design estimate and wire up a circuit having 3 lamps, controlled by 3 switches such that only one lamp is lightened at a time using conduit system of wiring.

Materials required Sl No 1 2 3 4 5 6 7 8

Materials

9

One way switch Batten Lamp holder Switch Box Round Block PVC Conduit 3Way Junction Box GI Saddles PVC insulated flexible Cu wire Screws

11 12

Two way switch MCB,DP

Specification 6A,250v 6A,250v PVC 5*7cm PVC 80mm 20mm dia 20mm dia 20mm dia 1.5mm2 38mm 20mm 13mm 250v,5A 16A,250V

quantity 1 3 3 3 180cm 2 9 560cm 3 6 18 2 1

Procedure 1. Draw the wiring diagram and lay out and get them approved by staff in charge. 2. Prepare the list of tools and materials required for the work and collect them. 3. Cut the conduit into required length and draw wires of respective colours through the conduit. 4. Connect the conduit with suitable interconnecting materials as per the layout and fix them on wiring board properly with correct size of clamps and screws.

Electrical Workshop

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VISAT

EEE Dept

Wiring Diagram

All dimensions are in cm Layout Diagram

All dimensions are in cm

5. Take out the wire terminals through switch box and round block.

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VISAT

EEE Dept

6. Fix the accessories such as fuse unit, neutral link switch and lamp holder as per the diagram. 7. Verify the connections and switch on the supply for testing.

S1 OFF ON ON ON

S2 OFF OFF ON ON

S3 OFF OFF OFF ON

L1 OFF ON OFF ON

L2 OFF OFF ON OFF

L3 OFF OFF OFF ON

Precautions 1. Avoid loose contacts and cuttings on conductors and wire. 2. Do not over tight the wires. 3. Never need over rated fuse wire inside the fuse units.

Result Wired up a circuit having 3 lamps, controlled by 3 switches such that only one lamp was lightened at a time using conduit system of wiring.

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VISAT

EEE Dept

Expt No:4 Date:

INSULATION MEGGER-EARTH MEGGER-MEASUREMENT OF INSULATION RESISTANCE AND EARTH RESISTANCE Aim 1. To measure the earth resistance using earth megger. 2. To measure the insulation resistance using insulation megger.

Tools Required Earth megger, Aluminium rod, connecting wires, screw driver, hammer, insulation megger

Earth Megger:

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EEE Dept

Procedure a) To measure earth resistance 1. Short the terminals P and C of earth megger. 2. Resistance is measured from each point and rod was drawn in between pit and first rod P2. 3. Readings are taken. 4. A second pit is shifted at 2.5 m and another reading is taken. 5. Earth resistance is the average of all values.

Observations Sl No

Distance of P2 from earth electrode

Electrical Workshop

Earth resistance

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VISAT

EEE Dept

Insulation Megger

b) To measure Insulation resistance 1. To find the insulation resistance, terminals of megger are connected across the winding and resistance is measured. 2. Terminals are connected to the winding and body of transformers and resistance is measured.

Result The earth resistance and insulation resistance were found out using earth megger and insulation megger respectively.

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EEE Dept

Expt No:5(a) Date:

FLUORESCENT LAMP WIRING Aim To wire up a fluorescent lamp as per the wiring diagram. Materials Required Sl No 1 2 3 4 5

Materials Tube frame with holder Fluorescent lamp Starter Choke Connecting wire

Specification

quantity

250V,40W 250V,40W 250V,40W

1 1 1 1 100cm

FLUORESCENT LAMP

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VISAT

EEE Dept

Procedure 1. Draw the wiring diagram and lay out and get them approved by staff in charge. 2. Prepare the list of tools and materials required for the work and collect them. 3. Cut the conduit into required length and draw wires of respective colourthrough the conduit. 4. The magnetic or electronic choke is filled in the frame of tube set and connections are made as per the wiring diagram. 5. In case of magnetic choke o glow type starter is also used. Thus the circuit is completed by connecting it to ac supply. 6. Verify the connections and switch on the supply for testing.

Result Wired up a fluorescent lamp and the circuit was tested.

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VISAT

EEE Dept

Expt No:5(b) Date:

WIRING OF CFL Aim To prepare a wiring circuit for CFL.

Materials Required Sl No 1 2 3 4 5 6 7 8 9 10 11 12 13 14

Materials

Specification

Quantity

MCB, DP CFL One way switch Batten Lamp holder One way junction box One way distribution box Plasic switch box Standard Cu wire Conduit U pipe Oval T 1/2”screw 3/4”screw Cu wire

250V,16A, 60W,250V 250V,5A 250V,5A Aquare type Metal clad type Piano type

1 1 1 1 1 1 1 1 3 3 1 5 4 1

16mm oval 16mm 16mm

18 S.W.G

Procedure 1. Draw the wiring diagram and lay out and get them approved by staff in charge. 2. Prepare the list of tools and materials required for the work and collect them. 3. Cut the conduit into required length and draw wires of respective colourthrough the conduit. 4. The neutral and the phase wire are connected to the lamp holder and CFL is inserted to it. The circuit is tested.

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VISAT

EEE Dept

Wiring Diagram

All dimensions are in cm Layout Diagram

All dimensions are in cm Result Wired up a CFL lamp and the circuit was tested.

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VISAT

EEE Dept

Expt No:5(c) Date:

WIRING OF MERCURY VAPOUR LAMP Aim To prepare an estimation and wire up a circuit for mercury vapour lamp and CFL.

Materials Required Sl No

Materials

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Screw type porcelain holder Mercury vapour lamp Choke MCB, DP PVC conduit Switch piano type Switch box Tee Elbow GI saddle clip Screw Screw Cu wire( black) Cu wire( red)

Specification

Quantity

80V, Hg vapour 240V,16A 20mm 1way For 1 piano switch 20mm 20mm 20mm 1/2 ” 3/4” 1mm2 1mm2

1 1 1 1 0.6m 1 1 1 1 3 14 4 0.4m 0.8m

Procedure 1. Draw the wiring diagram and lay out and get them approved by staff in charge. 2. Prepare the list of tools and materials required for the work and collect them. 3. Cut the conduit into required length and draw wires of respective colourthrough the conduit. 4. Wires are drawn through casing and capping is provided. 5. Circuit is verified by connecting to ac supply.

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VISAT

EEE Dept

Wiring Diagram

All dimensions are in cm

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VISAT

EEE Dept

Layout Diagram

All dimensions are in cm

Result The circuit for fluorescent lamp,CFL and mercury vapour lamp was wired up and tested.

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EEE Dept

Expt No:6

HOUSE WIRING

Date:

Aim To wire up a circuit to control house wiring as per the wiring diagram and layout.

Materials required Sl No 1 2 3 4 5 6 7 8 9

10 11 12 13 14

Materials One way switch Batten Lamp holder Switch Box Round Block PVC Conduit 4Way Junction Box Saddles PVC insulated flexible Cu wire Screws

Three pin plug Wiring board L joint(PVC bend) Ceiling rose MCB, DP

Specification

quantity

6A,250V 6A,250V PVC 5*7cm PVC 80mm 20mm dia 20mm dia 20mm dia 1100v grade/1.5mm2 38mm 20mm 13mm 250V,5A 3’*2’ 20mm dia 6A,250V 16A,250V

1 1 3 3 160cm 2 8 550cm 2 6 24 1 1 1 1 1

Procedure 1. Draw the wiring diagram and lay out and get them approved by staff in charge. 2. Prepare the list of tools and materials required for the work and collect them. 3. Cut the conduit into required length and draw wires of respective colour through the conduit. 4. Connect the conduit with suitable interconnecting materials as per the layout and fix them on wiring board properly with correct size of clamps and screws.

Electrical Workshop

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VISAT

EEE Dept

Wiring Diagram

All dimensions are in cm Layout Diagram

All dimensions are in cm

5. Take out the wire terminals through switch box and round block.

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VISAT

EEE Dept

6. Fix the accessories such as fuse unit, neutral link switch and lamp holder as per the diagram. 7. Verify the connections and switch on the supply for testing.

Precautions 1. Avoid loose contacts and cuttings on conductors and wire. 2. Do not over tight the wires. 3. Never need over rated fuse wire inside the fuse units.

Result Wired up a circuit to control house wiring as per the wiring diagram and layout and tested.

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VISAT

EEE Dept

SOLDERING PRACTICE Aim To solder two given pieces of wire .

Materials required Sl No

Particulars

Quantity

1 2 3 4

Connecting wire Soldering iron Solder Soldering flux

40cm 1 10cm 2gm

Figure

Procedure 1. Strip one end of the given two wires and remove the insulation. 2. Apply soldering flux on the metal wire. Electrical Workshop

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EEE Dept

3. Connect the soldering iron to the main supply and when it becomes hot place it on the solder so that it melts. 4. Now place the two metal wires in contact with each other and again apply the solder on its surface with the help of soldering iron.

Precaution 1. Avoid burning due to soldering iron. 2. Prevent the solder from falling on any parts of the body.

Result The two given strands of wire were soldered successfully.

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VISAT

EEE Dept

Date

RECTIFIER UNIT Aim To study the characterestics of 1. Half wave rectifier 2. Full wave rectifier and find the rms and average values of the voltage waveform with and without capacitor filter.

Materials required Sl No

Materials

Specification

1 2 3 4 5 6

Diodes Resistor Capacitor Step down transformer Bread board CRO

IN 4007 1kΩ 100µF 230/6-0-6,1A

Quantity 2 1 1 1 1 1

Procedure 1. Check all the components using multimeter. 2. Wire the circuit and give the supply. Observe the secondary voltage of transformer and output voltage across the load resistor simultaneously on CRO. Note the peak value Vm 3. Calculate the rms and average value using the given formulae.

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EEE Dept

Circuit Diagram Half wave Rectifier

Full wave Rectifier

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EEE Dept

Waveforms

Result The characteristics of half wave and full wave rectifier were studied and found the rms and average values of the voltage waveform with and without capacitor filter.

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