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#96979 - 01/11/06 05:25 PM Feeder Size  
shortcircuit  Offline
Member
Joined: Jun 2004
Posts: 608
massachusetts
Can I feed a sub-panel underground in a commercial building with #2 USE-2 aluminum wire connected to a 100amp breaker, under the 2005 NEC?

shortcircuit


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#96980 - 01/11/06 05:32 PM Re: Feeder Size  
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
No.


Don(resqcapt19)

#96981 - 01/11/06 05:49 PM Re: Feeder Size  
shortcircuit  Offline
Member
Joined: Jun 2004
Posts: 608
massachusetts
Violation of 110-14(C)(1)a ?

And the 6ft rule is gone in the 2005 NEC...right

shortcircuit


#96982 - 01/11/06 06:50 PM Re: Feeder Size  
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
Don- can you elaborate? I agree with part of your answer but the question is not clear if the wiring is outside the building or not.

Also not clear if it's in conduit or not.
Edited for added thought.

[This message has been edited by George Little (edited 01-11-2006).]


George Little

#96983 - 01/11/06 08:04 PM Re: Feeder Size  
shortcircuit  Offline
Member
Joined: Jun 2004
Posts: 608
massachusetts
George... the wire will be in pvc and the only part "in" the building is where it emerges from the slab to feed the panel...

shortcircuit


#96984 - 01/11/06 08:14 PM Re: Feeder Size  
winnie  Offline
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Joined: Sep 2003
Posts: 649
boston, ma
Umm, how about 310.15 in particular the fact that table 310.16 gives the ampacity of #2AL with 75C insulation and _terminations_ at 90A?

You'd need to jump a couple of hoops to use the 90C column, and 310.15(B)(6) doesn't apply here.

-Jon


#96985 - 01/11/06 08:34 PM Re: Feeder Size  
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
The '02 code permits 6 feet of conductor inside the building and the '05 doesn't. That's probaby what Don was getting at and Winnie is right about the ampacity thing. Max overcurrent 90a.


George Little

#96986 - 01/11/06 10:25 PM Re: Feeder Size  
shortcircuit  Offline
Member
Joined: Jun 2004
Posts: 608
massachusetts
Thank you for the feedback...

shortcircuit


#96987 - 01/12/06 12:44 PM Re: Feeder Size  
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
My issue is the ampacity of the conductor is 90 amps and cannot be protected by a 100 amp breaker.
Don


Don(resqcapt19)

#96988 - 01/12/06 02:23 PM Re: Feeder Size  
Helectric  Offline
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Joined: Jan 2005
Posts: 90
Brandon, SD
George,

Just curious about why were you were asking if the conductors were inside or outside of the building. Does this matter?

[This message has been edited by Helectric (edited 01-12-2006).]


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