What should be the value of earthing resistance for large power stations?

A. 12 Ω
B. 0.5 Ω
C. 2 Ω
D. 50 Ω

Answer: B. 0.5 Ω

Explanation: 
Value of Earth Resistance for Different Equipment

Equipment to be earthed  VS Maximum Value of Resistance Under Worst Conditions

Large power stations-----0.5 Ω
Major substations------1.0 Ω
Small substations-------2.0 Ω
Factories substations------1.0 Ω
Lattice steel towers --------3.0 Ω
Industrial machines and equipment----------0.5 Ω

According to Indian Electricity Rules, the value of earthing resistance for large power stations should be 0.5 Ω


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