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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 / tushar jana
I dont understand why people are complicating the issue....
the answer is very simple.
Consider Cable selection for the 3ph motor of 1kW
Formula>> P= root(3) x V x I x Cos(Phi) x Eff
p= power... Say 1kW
V= voltage (415Volt)
I= Unknown
Cos(phi)= 0.85.. say
Eff= Efficiency..= 0.85... say
Now,calculating this, we get>> I= 1.9Amp.. say approx 2A
Now derate this current (bcoz, cable will be laid in duct
or undergroung,etc) consider derating factor as 0.7 (say)
Then current is 2A/0.7=2.85A... say 3A..
now see the cable catlogue of any company.. say polycab..
See which size of cable can carry 3A current and use it...
thats it..
Approx.. for 1kW motor, 3Cx 2.5 Sq.mm cable is sufficient
upto 275m length.
NOTE: This is rough method of calculation. If cable length
is more or motor size is more... then voltage drop
calculation is also to be done.
Contact- 9665065050
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