Re: OT: Barn Electric

Posted by jdemaris on November 17, 2006 at 11:47:11 from (66.218.17.73):

In Reply to: OT: Barn Electric posted by Kent in KC on November 17, 2006 at 07:50:11:

#2 Aluminum is awful small wire for a 400' run. I don't know what type of wire you have - USE maybe? 70 amps is probably the safe limit - for ampacity and voltage drop.
220 VAC is allowed here in New York for triplex and a farm building separate from the main service panel, it just needs it's own ground system. But buried #2 aluminum is, more-or-less equal to #4 copper. A 200 foot run, buried, at the usual 2% voltage drop, is rated for 70 amps. So, a 400' run is rated at approx. a 4% voltage drop at 70 amps.

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