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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 / hosam
you have 100kva pole type TX
POWER 100x0.8= 80 kw
total load aprox: p= 47 kw
tx capactiy rate 47/100 =% 47 load
the resistance of earthing to be less than 3 ohms.
cable cu 70 squ mm to load 47 kw lengh 100 mtr
%e1= 0.0124(47x100)/70= 0.85 tolal load
from tx to panels supply 32.5 kw lengh 50mtr cable 4cxm35 mm squ + 14.5 kw lengh 25mtr cable10 squ mm
%e2= 0.0124(32x50)/35= 0.56
%e3= 0.124(14x25)/10= 0.4
%e = %(0.85+0.56+0.4)= %1,81 < %3
total of the voltage drop is acceptable
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