Question

Which class and size of gi pipe is used for earthing?

Answer 1

Answer:

The main reason for doing earthing in electrical network is for the safety. When all metallic parts in electrical equipment are grounded then if the insulation inside the equipment fails there are no dangerous voltages present in the equipment case.

Generally for plate type earthing normal Practice is to use

Cast iron plate of size 600 mm x600 mm x12 mm. OR

Galvanized iron plate of size 600 mm x600 mm x6 mm. OR

Copper plate of size 600 mm * 600 mm * 3.15 mm

Plate burred at the depth of 8 feet in the vertical position and GI strip of size 50 mmx6 mm bolted with the plate is brought up to the ground level.

These types of earth pit are generally filled with alternate layer of charcoal & salt up to 4 feet from the bottom of the pit.

For Pipe type earthing normal practice is to use GI pipe [C-class] of 75 mm diameter, 10 feet long welded with 75 mm diameter GI flange having 6 numbers of holes for the connection of earth wires and inserted in ground by auger method.

These types of earth pit are generally filled with alternate layer of charcoal & salt or earth reactivation compound.