Electrical peoples widely used cu strips instead of GI
strips for transformer neutral,because whenever unbalance
currents occurs in the line it have to flow to the
ground,for this we need high conductivity material.thats
why we are using cu. strip instead of GI strip.usually
copper is an high conductivity material than GI material
no issue in using GI strip for transformer earthing, but the problem is the GI strip used should be of sufficient size while copper strip used can be of reduced size, so places where space constraints occur, copper strips are used, moreover economical considerations are also important in chosing the strips. It won't affect the transformer performance if GI is used instead of copper.
we can use GI strips only for home purpose.when we recomend
for companys and transformers cu strips are more prforable
bcoz of its conducting capacity and with standing capacity
of heat and bending quality of its propotion.