electrical workshop manual
TRANSCRIPT
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
All dimensions are in cm
5. Take out the wire terminals through switch box and round block.
Electrical Workshop 2
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 was wired up to control one lamp by one switch and verified.
Electrical Workshop 3
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
Electrical Workshop 4
VISAT EEE Dept
Wiring Diagram
All dimensions are in cm
Layout Diagram
All dimensions are in cm
Electrical Workshop 5
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 S2 L1 L2C-2 C-2 Dim DimC-1 C-1 Bright BrightC-1 C-2 Bright DarkC-2 C-1 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 .
Electrical Workshop 6
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
Materials Specification quantity
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
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 7
VISAT EEE Dept
Wiring Diagram
All dimensions are in cm
Layout Diagram
All dimensions are in cm
Electrical Workshop 8
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 9
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
Materials Specification quantity
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
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 10
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.
Electrical Workshop 11
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 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
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.
Electrical Workshop 12
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:
Electrical Workshop 13
VISAT EEE Dept
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
Electrical Workshop 14
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.
Electrical Workshop 15
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
Materials Specification quantity
12345
Tube frame with holderFluorescent lampStarterChokeConnecting wire
250V,40W250V,40W250V,40W
1111
100cm
FLUORESCENT LAMP
Electrical Workshop 16
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.
Electrical Workshop 17
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
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.
Electrical Workshop 18
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.
Electrical Workshop 19
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
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.
Electrical Workshop 20
VISAT EEE Dept
Wiring Diagram
All dimensions are in cm
Electrical Workshop 21
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.
Electrical Workshop 22
VISAT EEE Dept
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
Materials Specification quantity
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
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 23
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.
Electrical Workshop 24
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.
Electrical Workshop 25
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.
Electrical Workshop 26
VISAT 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.
Electrical Workshop 27
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.
Electrical Workshop 28
VISAT EEE Dept
Circuit Diagram
Half wave Rectifier
Full wave Rectifier
Electrical Workshop 29
VISAT 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.
Electrical Workshop 30