Corrosion Allowance (Earthing) on an average steel corroded six times as fast as Copper when placed soil. the extent of corrosion depends on the property of soil. soil resistivity and corrosion Range soil resistivity Class of soil in ohm less than 25 severely corrosion 25-50 moderately corrosive 50-100 mildly corrosive Above 100 very mildly corrosive Earthing soil in Delhi Earthing value depends on soil Delhi
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