Question

Why is it necessary to connect an earth wire to electric appliances having metal covers?

Answer 1

it is done because if excessive current passes though aplance it can harm it so the earth wire take excessive current to ground and save appliances

Answer 2

Answer:

The earth wire provide low resistance conducting path for current

in the case of leakage of current to the metallic body of any appliances the earth wire absorbs the current and flows through to the earth where the user is saved from an electric shock.

Earth wire has green insulation.

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