Question

why neutral and earth wire is commom in circuit?

Answer 1

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here is your answer..
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The live wire carries current to the appliance at a high voltage. Theneutral wire completes the circuit and carries current away from the appliance. ... If a fault occurs where the live wire connects to the case, theearth wire allows a large current to flow through the live and earth wires.
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Answer 2

Neutral is a circuit conductor that normally carries current back to the source. All neutral wires of the same earthed (grounded) electrical system should have the same electrical potential, because they are all connected through the system ground.



WHAT IS THE DIFFERENCE BETWEEN EARTHING, GROUNDING AND EARTHING?

1.Earthing:
Earthing means connecting the dead part (it means the part which does not carries current under normal condition) to the earth for example electrical equipment’s frames, enclosures, supports etc.

2.Grounding:
Grounding means connecting the live part (it means the part which carries current under normal condition) to the earth for example neutral of power transformer.

3.Earthing:
Earth is used for the safety of the human body in fault conditions while Grounding (As neutral earth) is used for the protection of equipments.
Earthing is a preventive measure while Grounding is just a return path