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if we want ot select cable size with reference to load
current it take than what is the formula and it is same for
aluminium or copper?
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Answer Posted / mahesh sali
while selection of cable u should followed the below steps ;
1) cal. the full load current If.L= ( kw / 1.732 x v x
p.f. )
Assume the voltage drop of system as per application says
for motor it should be 10% Vd = 10%
2) Vd = ( 10/100) * v
3) Vd/ph. = ( Vd/1.732 )
4) R = vd/ph./IF.L
5) R-Rho*L/A
Assume , for Copper cable Rho = 1.72 e-8 Ohm-m
L = Length of cable
Base on the above assumation u can easily cal. the size of
cable.
After cal. the cable size , add. 25% extra in ur cal. the
cable size .
Thanking u
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