I want formula to calculate cable size as per load given in
kw & amp.I searched many sites but didn't right answer.Plz
reply me asap.
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Answer Posted / abhishek gupta
For 400V 3ph AC system
# For 1% permissible voltage drop
size of cable in mmsq (aluminium cable)=( I*L) /80
# For 2% permissible voltage drop
size of cable in mmsq (aluminium cable)=( I*L) /160
# For 3% permissible voltage drop
size of cable in mmsq (aluminium cable)=( I*L) /240
I = Full load current
L = Length in meter from load center to motor
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