Question

Metallic parts of an electric system exempted from earthing system

Answer 1

Answer:

the earthing system and the grounding system that may connects specific parts of an electric power system with the ground typically Earths conductive surface for safety and functional purposes

Explanation:

In a building  the connection of all metal parts of the building and all exposed conductive parts of the electrical equipment to an earth electrode prevents the appearance of  the dangerously  voltages between  any two simultaneously accessible metal parts.