Page 265 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

Procedure

TASK 1 :
1 Design the circuit as per required logic.

2 Draw the circuit diagram.
3 Prepare the wiring Table.
Note : Use standard symbols while preparing the power and control circuit, the design should meet
all the requirements.

TASK 2 :

1 Remove the detachable plate from the control panel.

2 Place the accessories on the plate as per layout.
Note : Ensure sufficient spacing between components while preparing layout. The minimum
spacing between components and race ways should be 100 mm for 415 V and 50 to 75 mm for less
than 415 V system
3 Fix the accessories on the plate by making necessary marking, drilling and tapping.

Note : Make sure that the marking is correct and use only suiTable size drill bit and tap

TASK 3 :

1 Take the measurement of control and power cable as per lay out.
2 Cut the required length of control and power cable.
3 Insert identification ferrule in each end of wire as per wiring diagram and wiring Table.

Note : Insert all the strand of the cable in the copper lug while crimping
1 Lay the cable through the slotted wire duct and dress it properly.
2 Refit the detachable plate to the control panel.
3 Bunch the control cables up to the push buttons and indication lamps which are fixed in panel door using nylon
cable tie.
4 Strip the insulation and crimp the copper lug on each end of wire using crimping tool.

Note : Remove only sufficient length of cable insulation and use proper sized lugs
5 Connect the cable to the accessories as per diagram.
Note : Over tightening of screw have to be avoided otherwise this can crush the strand and give a
poor contact
6 Connect suiTable size of earth wire to the cabinet and door.
7 Connect 3 phase supply with neutral to the control panel.
8 Check the circuit and test the DOL starter.

RESULT
Wired up and tested the DOL starter.

248

CITS : Power - Electrician & Wireman - Exercise 100