Earthing electrode shall consist of a CI pipe not less than 40 mm diameter and 3 meters long. The electrode shall be buried vertically in the ground as far as practicable below permanent moisture level, but in any case not less than 3 m below ground level. Wherever possible, earth electrodes shall be located close to water tap. The electrode shall be in one piece and no joints shall be allowed in the electrode.
The pipe earth electrode shall be kept vertically and surrounded with 150 mm thick layer of charcoal dust and salt mixture up to a height of 2.5 meters from the bottom. At the top of the electrode a G.I. threaded cap shall be provided for watering the earth. The main earth conductors shall be connected to the electrode just below the G.I. cap with proper terminal lugs and check nuts.
The G.I. cap over the pipe and earth connection shall be housed in a brickwork chamber, approximately 300 mm length x 300 mm wide and 300 mm deep. The brickwork chamber shall be provided with a cast iron inspection cover resting over a C.I.frame, embedded in masonry.
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