Required Cable Size - CR4 Discussion Thread

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Anonymous Poster #1	Required Cable Size 11/22/2011 12:20 PM
	What is the general formula for calculating the size of Copper and Alluminium cable? 1) If I have 35 mmsq copper cable, then what is the current capacity? Suggest me formula for both alluminium and copper cable of same size. 2) For 100 amps. Current carrying, which size of Alluminium or copper cable required? I required exact equation for that. Plz. help. Thanks
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PWSlack Guru 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. Posts: 32175 Good Answers: 839	#1 Re: Requred Cable Size 11/22/2011 12:32 PM
	The general formula is British Standard 7671 <sigh>. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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SolarEagle Guru Join Date: Mar 2007 Location: by the beach in Florida Posts: 33392 Good Answers: 1817	#2 Re: Requred Cable Size 11/22/2011 1:00 PM
	Cool Tool... http://myelectrical.com/tools/cable-sizing-calculator __________________ All living things seek to control their own destiny....this is the purpose of life
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redfred Guru Join Date: Dec 2008 Location: Long Island NY Posts: 15600 Good Answers: 981	#3 Re: Required Cable Size 11/22/2011 3:19 PM
	First you must know where you are installing this cable. This will then allow you to figure out which wiring standards, if any, are the wiring standards that you are legally compelled to meet. The correct standard will also identify if you are qualified to install cables at this location. (Something I doubt because you ask this fundamental question.) You will find that most standards do not have precise equations because a safe installation of electric cables that handle 100 amperes of current involves more than just the linear concerns of voltage drop and heat dissipation. __________________ "Don't disturb my circles." translation of Archimedes last words
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jack of all trades Guru Join Date: Sep 2006 Location: Auckland, New Zealand Posts: 8777 Good Answers: 376	#4 Re: Required Cable Size 11/22/2011 6:32 PM
	I required exact equation for that. There isn't one as it depends on cable, application and standard specific de-rating factors. Please read the site rules as homework questions (which this sounds like) are not allowed on CR4. __________________ jack of all trades
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Users who posted comments:

jack of all trades (1); PWSlack (1); redfred (1); SolarEagle (1)

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