Calculate Size of Copper Strip for Grounding

How to calculate the size of the copper strip for grounding and earthing the machinery and equipment when we know the amperes of the machinery and the equipment.

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umesh bhuyan

  • Nov 20th, 2014

Earthing strip is generally avl with aluminium or copper like 25*6mm or we can use 8/6 swg g.i wire as appropriate. But main logic is that we have to keep earth resistance within the limit,1ohm.that means we have to check the earth resistance value at the pit and choose the size of earth wire. Suppose your earth value is 0.8ohm, then we have to select the earth conductor whose resistance is under 0.5 ohm.that may be larger cross section or thickness of strip.

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