The size of the earth wire is determined by

A. The atmospheric conditions
B. The voltage of the service wire
C. The ampere capacity of the service wires
D. None of the above

Answer: C. The ampere capacity of the service wires

Explanation:
Earth wire:
The main function of the earth wire is to prevent the live wire from overloading and absorbs the excess electrons & flows to the ground.

The size of the earth wire is determined by the ampere capacity of the service wires.

The minimum size of earth wire for the light circuit is 1 mm square for copper and 1.5 mm square for aluminum.
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