Question

explain the principle of earthing

Answer 1

In an electrical installation, an earthing system or grounding system connects specific parts of that installation with the Earth's conductive surface for safety and functional purposes. The point of reference is the Earth's Conductive surface.

Answer 2

Mostly, the galvanised iron is used for the earthing. The earthing provides the simple path to the leakage current. The short circuit current of the equipment passes to the earth which has zero potential. Thus, protects the system and equipment from damage.