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If you do not have a underground metal water pipe coming into the building then you put a ground rod at least 2 feet from the buildingf into the ground attach one end of the wire to ground rod run your ground wire and attach the other end to the neautral bar in the panel box. You need special transformer called as grounding transformer for this purpose. Grounding transformer is basically Wye-Delta type transformer with Wye connected winding connected to 3 line wires and derived neutral from Wye side grounded through desired grounding device. Delta side winding of grounding transformer is kept at no load.

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