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Wire for 600A 1Phase service #185665
03/23/09 09:22 PM
03/23/09 09:22 PM
Obsaleet  Offline OP
Joined: Apr 2003
Posts: 362
Hi Guys, I am doing a 600a 1phase service and I was going to use 350kmcm in parallel, my friend from a diffrent firm is telling me they used 300kmcm for one just recently. Now I am second guessing myself, so I am turning to you all.


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Re: Wire for 600A 1Phase service [Re: Obsaleet] #185667
03/23/09 10:08 PM
03/23/09 10:08 PM
HotLine1  Offline

Joined: Apr 2002
Posts: 6,935
Brick, NJ USA
300KCMil Copper, 75 degree col is 285 amps,Based on 240.4 (B)parallel is 570 amps, next higher available is 600 amps.

300's work.

Re: Wire for 600A 1Phase service [Re: Obsaleet] #185668
03/23/09 10:14 PM
03/23/09 10:14 PM
Yoopersup  Offline
Joined: Mar 2003
Posts: 840
If in two seperate conduits 300 kcmil is good for 285 amps at 75c. see 240.4 (b) (800 amps or less next higest breaker size) .
240.6 300 next breaker size is 600.
285 plus 285 = 570
if in one single conduit see table 310.15(B)(2)(a)
4-6 80%
570x80%=456 next higest per 240.6= 500amp.
Same Conduit would require 400 Kcmil
335x2= 670 x 80%= 536 . 240.6 next higest 600
This is with 3 wires in conduit single phase. Or
6 wires in conduit single phase.


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