Page 298 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

TASK 2: Estimate the cost / bill of materials for wiring of industrial installation / workshop

The main switch, motor switch and starters are assumed to be mounted at a height of 1.5m from
the ground level.
Height of horizontal run from the ground level will be 2.5m
The cost of motors and starters are not included in the estimate

SL. Motor FL current IL(A) Starting current Recommended Cable size
No. I8=2IL(A)
2.0 Sq mm copper conductor cable
1 5HP Motor 7.5 15 (17A) or 2.5Sq mm Aluminium
Conductor Cable (16)A
2.0Sq mm Copper conductor cable
2 3 HP Motor 4.68 9.36
(17A)
1.0Sq mm Copper conductor cable
3 1/2 HP Motor 2.25 4.5
(11A) Minimum recommended Cable
1.0Sq mm Copper conductor cable
4 1 HP Motor 1.56 3.12
(11A) Minimum recommended Cable
Select the suiTable switches and distribution board
• 32 A,415V ICTP switch with fuse cab be used as main switch
• 16A, 415V ICTP switches with fuses can be used form 5HP , 3HP , & 1HP motors
• 16 A , 240V ICDP Switches with fuses can be used for ½ HP motor
• 415V, 4 Way,16A per way ic distribution board with Natural link can be used for power distribution.
Draw the single line diagram of power wiring
Calculate the size and length of conduit.

281

CITS : Power - Electrician & Wireman - Exercise 105 CITS : Power - Electrician & Wireman - Exercise 105