Doesn't make sense to me

Posted by jdemaris on November 17, 2006 at 16:06:37 from (69.67.235.174):

In Reply to: Re: OT: Barn Electric posted by Kent in KC on November 17, 2006 at 12:48:46:

I guess I don't understand, especially if you've been advised by an electrician. As far as code goes, the breaker needs to trip before the wire melts - so for that, #2 cable protected by a 100 amp breaker is safe. The code though, doesn't care much about voltage drop and stuff than won't run right. A 400 foot one-way run of #2 aluminum cable will have a large loss if close to 100 amps is every drawn on it. Over 6%. And you did say 100 amps, correct? #2 cable makes no sense. Most power companies will not permit any run over 150' with #2 aluminum because of the loss. And, you had at first mentioned 120 VAC?? That's even worse. Even figuring with a high but acceptible voltage loss of 3%, a 400 foot one-way run for 220VAC at 100 amps needs either #2 copper or 2/0 aluminum - not #2 aluminum. And, if it was only 120 VAC - it'd need 3/0 copper or 250 MCM. 120 VAC at 100 amps and a 3% drop can go about 110 feet max.
Check the math yourself, there are wire-size calculators all over, e.g.
http://www.paigewire.com/agwirecalc.asp

Replies:

• Re: Doesn't make sense to me doogdoog 00:35:51 11/18/06 (1)
  • Re: Doesn't make sense to me jdemaris 06:09:41 11/18/06 (0)

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