ABSTRACT
Testing Earth Electrode Resistance, in many rural areas, the supply system is TT and hence reliance is placed on the general mass of earth for a return path under earth fault conditions. Connection to earth is made by an electrode, usually of the rod type, and preferably installed. In order to determine the resistance of the earth return path, it is necessary to measure the resistance that the electrode with earth. The earth electrode resistance tester or earth fault loop impedance tester instruments are used for testing the earth electrode resistance. The earth electrode resistance test is conducted in a similar fashion with the earth replacing the resistance and a potential electrode replacing the slider. The maximum resistance recorded is the electrode resistance and area that extends to 2.5-3 m beyond the electrode is known as earth electrode resistance area. There are two methods of making the measurement, one using a proprietary instrument and other using a loop impedance tester.
