Question

why Earth wire is called additional safety device​

Answer 1

Explanation:

Thus the earth wire helps protect you if you touch the case of an appliance that is "live". The earth pin on a plug is longer than the line and neutral pins. This ensures that the earth pin always connects with the socket first.

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Answer 2

Answer:

An earth wire is literally a wire that goes down into the earth - also known as an “earth ground.” It's meant to be the electrical path that unwanted electricity (such as lightning or a short-circuit) finds easiest to take