Answer Posted / binay agrawal

generally, for low rating full load current should be 3
times for aluminium cable, & 4 times for copper cable.
so, here 550/4=137.5 sq mm,
also 550/3=183.33 sq mm.
but this is for low rating, in high rating ratio is
decrease,
i.e. for copper 550/3= 183.33 sqmm
& for aluminium 550/2= 275 sq mm.

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