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

No.

Violation of 110-14(C)(1)a ?

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

shortcircuit

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... 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

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

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.

Thank you for the feedback...

shortcircuit

My issue is the ampacity of the conductor is 90 amps and cannot be protected by a 100 amp breaker.
Don

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).]

The '02 code allowed 6' of USE inside the building and the '05 removed that allowance, if I'm reading that correctly. We are on the '02 code here in Michigan and when I read Don's post I hadn't checked the '05.

I see. For some reason I thought that your question related to ampacity which of course puzzled me. I was just of track.

Thanks for clearing this up for me!