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Answer Posted / rajesh pal
Value of earthing G.I should be minimun <3 ohm this value we can use for body earth any machine D.G ,Transformer any other
and copper earth value shoul be < 1 ohm it will bettor for Nutruel earth for D.G and transformer and also connect with isolation transformer and some medical machines MRI, CT scan,kottery machine OT and other machine which require.
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