Question

What do u mean by local earthing ​

Answer 1

Local earthing,in electrical terms,earthing commonly known as grounding,refers to a system designed to protect electrical wires and components from damage caused by sudden electrical power surges. It means earthing at the point of the installation to be earthed.

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Answer 2

In electrical terms,earthing, commonly known asgrounding, refers to a system designed to protect electrical wires and components from damage caused by sudden electrical power surges. It means earthing at the point of the installation to be earthed.
Earthing is used to protect you from an electric shock. It does this by providing a path (a protective conductor) for a fault current to flow to earth. It also causes the protective device (either a circuit-breaker or fuse) to switch off the electric current to the circuit that has the fault.