Answer / mrinal

At first calculate the current of the load, after that
derate the current considering derating factor(depending
on site condition and laying of cable) after choose the
cable size from cable catalog considering derating current.
After that measure the length of cable required from supply
point of load to load poin. Calculate the voltage drop
which will max 3% (resistance and reactance of cable found
from cable catalog of selecting cable) if voltage drop>3%
then choose next higher size of cable.

Answer / santhosh k.m

actualy we take cables in current rating

1 Sq.mm = 0.8 or 0.9 A for power cables.

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