Ing pasir, watu watu lan lemah liyane kanthi resistensi bumi sing gedhe, supaya bisa nyukupi syarat resistensi grounding sing kurang, kothak grounding sing kasusun saka pirang-pirang badan grounding sing podo karo asring digunakake.Nanging, kadhangkala akeh bahan baja sing dibutuhake lan area grounding banget ...
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