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 / anupam mathur
Cable size depends on 1)Voltage Drop, 2)Distance, and 3)Load
So u have to calculate first the permissible voltage drop.
For lighting circuit permissible voltage drop:
2% of the rated voltage + 1 volt
2 X 230 /100 +1 = 460/100 + 1 volt = 5.6V
For motoring load
5% of the rated voltage
5 X 415/100 = 20.75 V
Now the formula for calculating voltage drop:
Voltage Drop = I X D (r X 0.85 + Xc X 0.53)/No. of runs X 1000
I : Current
D : Distance
r : Resistance
Xc : Capacitive reactance
If the voltage drop comes within the limits then ur cable
selection is ok.
| Is This Answer Correct ? | 94 Yes | 50 No |
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