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THOBIAS MABUGO
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Join Date: Sep 2010
Posts: 45

DC loads Cable Sizing

11/19/2010 7:14 AM

What are the main factors to consider in calculating the size of the wire for DC loads?

Is it different from AC loads as in these loads, full load current is the main consideration?Please help guys, and suggest any link you know.

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JRaef
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United States - Member - New Member Engineering Fields - Power Engineering - New Member

Join Date: Sep 2006
Location: California, USA, where the Godless live next door to God.
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#1

Re: DC loads Cable Sizing

11/19/2010 9:17 PM

For field wiring, amps is amps is amps. Amps know not from AC or DC.

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sms149
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Engineering Fields - Electrical Engineering - New Member India - Member - New Member Popular Science - Genetics - New Member Technical Fields - Technical Writing - New Member Safety - ESD - New Member Engineering Fields - Power Engineering - New Member

Join Date: Jul 2010
Location: INDIA MUMBAI
Posts: 67
#2

Re: DC loads Cable Sizing

11/20/2010 1:26 AM

There is no difference between the sizing of cables between AC and DC. in both the case it depends upon the full load current. Only the formula for evaluating the voltage drop is different in case of AC and DC system.

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STEVENS MOENG
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Join Date: Nov 2010
Posts: 2
#3

Re: DC loads Cable Sizing

11/20/2010 10:32 AM

The criteria of calculating the conductor size of AC and DC loads is the same except for the Voltdrop calculations.

I will suggest that when you do voltdrop calculations, apply 1.5% of the system voltage during start-up conditions and 3% of the system voltage during steady-state conditions.

All comments are welcomed!
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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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: DC loads Cable Sizing

11/22/2010 10:36 AM

The best link is British Standard 7671 - available from all good BSI bookshops!

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