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#96979 - 01/11/06 01:25 PM Feeder Size
shortcircuit Offline
Member
Registered: 06/27/04
Posts: 608
Loc: 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 01:32 PM Re: Feeder Size
resqcapt19 Offline
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Registered: 11/10/00
Posts: 2148
Loc: IL
No.
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#96981 - 01/11/06 01:49 PM Re: Feeder Size
shortcircuit Offline
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Registered: 06/27/04
Posts: 608
Loc: massachusetts
Violation of 110-14(C)(1)a ?

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

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#96982 - 01/11/06 02:50 PM Re: Feeder Size
George Little Offline
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Registered: 01/18/04
Posts: 1488
Loc: 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).]
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#96983 - 01/11/06 04:04 PM Re: Feeder Size
shortcircuit Offline
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Registered: 06/27/04
Posts: 608
Loc: 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...

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#96984 - 01/11/06 04:14 PM Re: Feeder Size
winnie Offline
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Registered: 09/15/03
Posts: 649
Loc: 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
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#96985 - 01/11/06 04:34 PM Re: Feeder Size
George Little Offline
Member
Registered: 01/18/04
Posts: 1488
Loc: 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.
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#96986 - 01/11/06 06:25 PM Re: Feeder Size
shortcircuit Offline
Member
Registered: 06/27/04
Posts: 608
Loc: massachusetts
Thank you for the feedback...

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#96987 - 01/12/06 08:44 AM Re: Feeder Size
resqcapt19 Offline
Member
Registered: 11/10/00
Posts: 2148
Loc: IL
My issue is the ampacity of the conductor is 90 amps and cannot be protected by a 100 amp breaker.
Don
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#96988 - 01/12/06 10:23 AM Re: Feeder Size
Helectric Offline
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Registered: 01/07/05
Posts: 90
Loc: 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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