![]() ![]() R: V/I: Resistance in Ohm Ω Earth Conductor Sizing S: Distance between two electrodes in meter (m) Based on soil resistivity testing at various locations, average soil resistivity 12.46 ohm-m shall be considered for earthing system calculation which is done by wenner’s method. The maximum value of a single line to earth fault current is considered as 80 kA. GI strip shall be considered as the main earth conductor and earth electrodes shall be 80 mm dia pipe meeting the requirements of IS 3043. The material of the earth grid conductor shall be galvanized iron (GI). The uniform soil model assumption is based on a 3-meter long pipe electrode used at this installation which cannot penetrate to the second layer of lower soil resistivity. Sizing of earth grid conductor shall be done by considering fault current 1 sec. ![]() In this article, we will discuss how to determine the number of earth pits, the size of the earth grid conductor, and the overall resistance of the earthing system. ![]()
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