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bs_28
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Join Date: Dec 2009
Posts: 1

Calculating Current Carrying Capacity

12/04/2009 1:27 PM

is there any exact formulae for calculating current carring capacity of alluminium armoured cable?just like 180 sq.mm 3.5 core....
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lyn
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Join Date: Oct 2008
Posts: 42355
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#1

Re: Calculating Current Carrying Capacity

12/04/2009 1:53 PM

This probably won't help.

cable current carrying capacity - Voltimum UK - Electrical

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nezihozfirat
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Location: Istanbul. European side
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#2

Re: Calculating Current Carrying Capacity

12/04/2009 3:01 PM

Of course there are formulas. All of them are global calculations.

Better ask the manufacturer's catalogs, listing their real test results, for each cable they manufacture, under different conditions. This is the reliable way.

Kindest Regards.
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electricalexpert65
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#3

Re: Calculating Current Carrying Capacity

12/05/2009 4:20 AM

Best is to follow the manufacturers' catalogues. At least the DC Current Carrying Capacity can be calculated as it is affected only by the resistance which has got a very linear relationship with the cross section of the cable conductor.

Whereas AC current carrying capacity is decided by the impedance, which again is dependant upon the Resistance & Reactance of the cable. The resistance would vary for different cross sections of the conductor linearly but the reactances will not vary linearly. That is the problem.
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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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#4

Re: Calculating Current Carrying Capacity

12/07/2009 3:45 AM

→ British Standard 7671.

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