Answer Posted / ramesh kumar k

the size of the cable depends upon the material used in the
cable...

if u go for copper cable... the copper has got the current
carrying capacity of 2A/sq.mm continuously with out
overloading effect. so if you want for 550A,

550/2 = 225 sq.mm copper cable u have to use...

i think it is 1.2A/sq.mm for Aluminium...

550/1.2 = 458 sq.mm Aluminium cable u have to use...

like this.... the current carrying capacity is different
for different materials...

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