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chandrakant vishwakarma
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Join Date: Sep 2012
Posts: 4

Formula For Current Carrying Capacity of Al/Cu Power Cable

10/01/2012 1:07 PM

Sir, i want to know the formula for current carrying capacity of diffrent type industrial cable like 350sq.mm,400sq,mm
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lyn
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Join Date: Oct 2008
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#1

Re: Formula For Current Carrying Capacity of Al/Cu Power Cable

10/01/2012 1:22 PM

Most major manufacturers have charts that give these ratings. The amp ratings will vary by manufacturer.

Search GlobalSpec for wire sizing charts.
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Arun Sankar
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Join Date: Aug 2012
Posts: 3
#2

Re: Formula For Current Carrying Capacity of Al/Cu Power Cable

10/01/2012 9:25 PM

Hi It may help you

VD= 2*K*I*L/ CSA WHERE: VD= VOLTAGE DROP I= CURRENT L= DISTANCE OF THE LOAD FROM THE OUTLET (IN FT) K= 12 FOR COPPER AND 19 ALUMINUM (FOR MAXIMUM TEMP OF 75 DC) CSA= CONDUCTOR CROSS SECTIONAL AREA IN CIRCULAR MILS.

MV =(VD*1000)/L*I L =length of cable I = Current rating I = P/(1.73*v*Pf) MV = Milli Voltage Drop/Amp/meter OR VD = L * I * MV/1000 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
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#3

Re: Formula For Current Carrying Capacity of Al/Cu Power Cable

10/02/2012 3:13 AM

It depends upon the installation method and the de-rating requirements for similar cables running parallel.

Buying a copy of British Standard 7671 and studying it would be a worthwhile investment.

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