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Feeder Size #96979
01/11/06 05:25 PM
01/11/06 05:25 PM
S
shortcircuit  Offline OP
Member
Joined: Jun 2004
Posts: 610
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

2017 / 2014 NEC & Related Books and Study Guides
Re: Feeder Size #96980
01/11/06 05:32 PM
01/11/06 05:32 PM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
No.


Don(resqcapt19)
Re: Feeder Size #96981
01/11/06 05:49 PM
01/11/06 05:49 PM
S
shortcircuit  Offline OP
Member
Joined: Jun 2004
Posts: 610
massachusetts
Violation of 110-14(C)(1)a ?

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

shortcircuit

Re: Feeder Size #96982
01/11/06 06:50 PM
01/11/06 06:50 PM
G
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
Re: Feeder Size #96983
01/11/06 08:04 PM
01/11/06 08:04 PM
S
shortcircuit  Offline OP
Member
Joined: Jun 2004
Posts: 610
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

Re: Feeder Size #96984
01/11/06 08:14 PM
01/11/06 08:14 PM
W
winnie  Offline
Member
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

Re: Feeder Size #96985
01/11/06 08:34 PM
01/11/06 08:34 PM
G
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
Re: Feeder Size #96986
01/11/06 10:25 PM
01/11/06 10:25 PM
S
shortcircuit  Offline OP
Member
Joined: Jun 2004
Posts: 610
massachusetts
Thank you for the feedback...

shortcircuit

Re: Feeder Size #96987
01/12/06 12:44 PM
01/12/06 12:44 PM
R
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)
Re: Feeder Size #96988
01/12/06 02:23 PM
01/12/06 02:23 PM
H
Helectric  Offline
Member
Joined: Jan 2005
Posts: 91
Spearfish, 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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