how to measure earth pit resistance
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Answer Posted / salman hazari
Earth pit testing is measured by megger or earth pit tester. There are 4 terminals in megger. P1, P2, C1, C2, it means there are two potential terminals and two current terminals. while measuring earth pit resistance we have the requirement of 3 wires. one wire will be connected between one earth electrode which has drived in ground and P1 point of tester from a distance of 30 meters from earth pit. 2nd wire will be connected between one earth electrode which has drived in ground and C1 point of tester from a distance of 15 meters from earth pit. Both electrodes in opposite direction. Shorted P2 & C2 terminal by a small piece of wire. connect one wire to the Earth pit from shorted wire. Move the handle of megger. you will get the resistance value. As theoretically value should be 0 ohm. But practically it should be less then 1 ohm.
Thanks
salman Hazari
chief Engineer
Keys hotel
pimpri, pune
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