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

SlNo

Materials Specification quantity

123456789

10

111213

One way switchBatten Lamp holderMCB,DPSwitch BoxRound BlockPVC Conduit3Way Junction BoxSaddlesPVC insulated flexible Cu wireScrews

Incandascent lampWiring boardPVC Tee

6A,250v6A,250v16A,240vPVC 5*7cmPVC 70mm20mm dia20mm dia20mm dia1.5mm2

38mm20mm13mm250v,40W3’*2’20mm dia

11111

60cm16

160cm

1414111

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 1

VISAT EEE Dept

Wiring Diagram

All dimensions are in cm

Layout Diagram


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


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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.


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

Material Specification Quantity

1

2345678910111213

14

One way distribution metal and led type neutral linkPVC conduitMCB, DPTwo way switchPVC Switch boxJunction boxJunction boxJunction boxSteady batten lamp holderGI SaddleBulbPVC bendPVC insulated multistranded flexible Cu wireScrew

20mm250V,16A,250V,5A ,piano5x7cm20mm,3way20mm,4way20mm,1way6A,250V20mm250V,60W20mm

1.5 mm2,1100V38mm13mm20mm

1

1.2m12211221221

3.8m3148


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Wiring Diagram


Layout Diagram



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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.




Switching operations

S1 S2 L1 L2C-2 C-2 Dim DimC-1 C-1 Bright BrightC-1 C-2 Bright DarkC-2 C-1 Dark Dark

Precautions


Result

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


VISAT EEE Dept

Expt No:2Date:

STAIR CASE WIRING

Aim

Two wire up a circuit to control one lamp by two switches.

Materials Required

SlNo


123456789

10

1112

Two way switchBatten Lamp holder]MCB,DPSwitch BoxRound BlockPVC Conduit3Way Junction BoxSaddlesPVC insulated flexible Cu wireScrews

Incandascent lampPVC Tee

6A,250v6A,250v16A,250VPVC 5*7PVC 70mm20mm dia20mm dia20mm dia1.5mm2

38mm20mm13mm250v,40W20mm dia

2121

120cm26

420cm

1614111

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


on wiring board properly with correct size of clamps and screws.5. Take out the wire terminals through switch box and round block.


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Wiring Diagram


Layout Diagram



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Precautions


Result

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


VISAT EEE Dept

Expt No:3Date:

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

SlNo


12345678

9

1112

One way switchBatten Lamp holderSwitch BoxRound BlockPVC Conduit3Way Junction BoxGI SaddlesPVC insulated flexible Cu wireScrews

Two way switchMCB,DP

6A,250v6A,250vPVC 5*7cmPVC 80mm20mm dia20mm dia20mm dia1.5mm2

38mm20mm13mm250v,5A16A,250V

1333

180cm29

560cm

361821

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




VISAT EEE Dept

Wiring Diagram


Layout Diagram




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S1 S2 S3 L1 L2 L3OFF OFF OFF OFF OFF OFFON OFF OFF ON OFF OFFON ON OFF OFF ON OFFON ON ON ON OFF ON

Precautions


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.


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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Procedure

a) To measure earth resistance1. 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

Earth resistance


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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.


VISAT EEE Dept

Expt No:5(a)

Date:

FLUORESCENT LAMP WIRING

Aim

To wire up a fluorescent lamp as per the wiring diagram.

Materials Required

SlNo


12345

Tube frame with holderFluorescent lampStarterChokeConnecting wire

250V,40W250V,40W250V,40W

1111

100cm

FLUORESCENT LAMP


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Procedure


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.


VISAT EEE Dept

Expt No:5(b)Date:

WIRING OF CFL

Aim

To prepare a wiring circuit for CFL.

Materials Required

Sl No

Materials Specification Quantity

1234567891011121314

MCB, DPCFLOne way switchBatten Lamp holderOne way junction boxOne way distribution boxPlasic switch boxStandard Cu wireConduitU pipeOval T1/2”screw3/4”screwCu wire

250V,16A,60W,250V250V,5A250V,5AAquare typeMetal clad typePiano type

16mm oval16mm16mm

18 S.W.G

11111111331541

Procedure


conduit. 4. The neutral and the phase wire are connected to the lamp holder and CFL is inserted to it.

The circuit is tested.


VISAT EEE Dept

Wiring Diagram


Layout Diagram


Result

Wired up a CFL lamp and the circuit was tested.


VISAT EEE Dept

Expt No:5(c)Date:

WIRING OF MERCURY VAPOUR LAMPAim

To prepare an estimation and wire up a circuit for mercury vapour lamp and CFL.

Materials Required

Sl No Materials Specification Quantity

1234567891011121314

Screw type porcelain holderMercury vapour lampChokeMCB, DPPVC conduitSwitch piano typeSwitch boxTeeElbowGI saddle clipScrewScrewCu wire( black)Cu wire( red)

80V, Hg vapour240V,16A20mm1wayFor 1 piano switch20mm20mm20mm 1/2 ” 3/4”1mm2

1mm2

11110.6m111131440.4m0.8m

Procedure


conduit. 4. Wires are drawn through casing and capping is provided.5. Circuit is verified by connecting to ac supply.


VISAT EEE Dept

Wiring Diagram



VISAT EEE Dept

Layout Diagram


Result

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


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Expt No:6

Date: HOUSE WIRING

Aim

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

Materials required

SlNo


12345678

9

1011121314

One way switchBatten Lamp holderSwitch BoxRound BlockPVC Conduit4Way Junction BoxSaddlesPVC insulated flexible Cu wireScrews

Three pin plugWiring boardL joint(PVC bend)Ceiling roseMCB, DP

6A,250V6A,250VPVC 5*7cmPVC 80mm20mm dia20mm dia20mm dia1100v grade/1.5mm2

38mm20mm13mm250V,5A3’*2’20mm dia6A,250V16A,250V

1133

160cm28

550cm

26241111

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




VISAT EEE Dept

Wiring Diagram


Layout Diagram




VISAT EEE Dept



Precautions


Result

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


VISAT EEE Dept

SOLDERING PRACTICE

Aim

To solder two given pieces of wire .

Materials required

Sl No

Particulars Quantity

1234

Connecting wireSoldering ironSolderSoldering flux

40cm110cm2gm

Figure

Procedure

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


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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.


VISAT EEE Dept

Date

RECTIFIER UNIT

Aim

To study the characterestics of

1. Half wave rectifier2. 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 Quantity

123456

DiodesResistorCapacitorStep down transformerBread boardCRO

IN 40071kΩ100µF230/6-0-6,1A

211111

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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Circuit Diagram

Half wave Rectifier

Full wave Rectifier


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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.


Documents

Electrical Workshop Manual