Why is it necessary to have an earth wire installed in a power circuit and not in a lighting circuit?
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Well there's two main factors here.
The current drawn by lighting circuits is quite low. But currents through power circuits are usually quite high. So if there's any fault occuring wherein the body of the machine is exposed to the live wire, there is a greater risk for harm to the user in case of power circuits.
Low power circuits usually have plastic or other insulating material as the outer shell. But in case of high power circuits, like your microwave, the body is metal and hence it has to be earthed to prevent conduction by the body so that it doesn't harm the user when they touch it.
I think the second point is usually more acceptable as the reason for earthing.
The current drawn by lighting circuits is quite low. But currents through power circuits are usually quite high. So if there's any fault occuring wherein the body of the machine is exposed to the live wire, there is a greater risk for harm to the user in case of power circuits.
Low power circuits usually have plastic or other insulating material as the outer shell. But in case of high power circuits, like your microwave, the body is metal and hence it has to be earthed to prevent conduction by the body so that it doesn't harm the user when they touch it.
I think the second point is usually more acceptable as the reason for earthing.
Arupdpg:
Thank u
its ok
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