If the wiring in a building has a 2.4-kW load, what will be the permissible insulation resistance to earth for a 240-V system of supply?
If the wiring in a building has a 2.4-kW load, what will be the permissible insulation resistance to earth for a 240-V system of supply?
Right Answer is:
0.12 MΩ
SOLUTION
Given, P = 2.4 kW, V = 240 V
IFL = 2400 / 240 = 10 A
According to IE Rule 48:
ILeakage = Ifull/5000
= 10/5000 = 0.002 A
Insulation Resistance (IR) = Supply voltage/ILeakage
= 200/0.002 = 120,000 = 0.12 MΩ