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?

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

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