2 substantial steel flaag type earthing terminals, each having 2 14mm diameter holes on 55mm centres and able of carrying the full fault current of lower voltage for a period not less than 30s shall be provided locate one on either side of the transformer, near to the bottom of the tank to facilitate connection to the substation earthing systemtank surffaceall gasket surfaces at the tank shall be treated with utmost care to prevent unwanted oil leakage. All gasket surface shall also be painted with a special paint against corrosionBefore painting, outer surfacr of the tank shall be sand blasted in accordance with international standard. At spray painting, minimum thickness is 140um for three coasts. Paint colour shall be cemeting grey for tank as well as for conservator and radiator
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