Question

What do you mean by the term local earthing? Explain how it is done.

Answer 1

Local earthing is made near kWh meter. In this process, a 2 - 3-metre deep hole is dug in the ground. A copper rod placed inside a hollow insulating pipe is put in the hole. A thick copper plate of dimensions 50 cm $\times$ 50 cm is welded to the lower end of the copper rod and it is buried in the ground. The plate is surrounded by a mixture of charcoal and salt to make a good earth connection.

To keep the ground damp, water is poured through the pipe from time to time. This forms a conducting layer between the plate and the ground. The upper end of the copper rod is joined to the earth connection at the kWh meter.