Feeder Size

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Feeder Size

#96979 01/11/06 05:25 PM

Joined: Jun 2004

Posts: 613

massachusetts

S

shortcircuit Offline

OP

Member

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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Re: Feeder Size

#96980 01/11/06 05:32 PM

Joined: Nov 2000

Posts: 2,148

IL

R

resqcapt19 Offline

Member

No.

Don(resqcapt19)

Re: Feeder Size

#96981 01/11/06 05:49 PM

Joined: Jun 2004

Posts: 613

massachusetts

S

shortcircuit Offline

OP

Member

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

Joined: Jan 2004

Posts: 1,507

Michigan USA

G

George Little Offline

Member

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

Joined: Jun 2004

Posts: 613

massachusetts

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shortcircuit Offline

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Member

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

Joined: Sep 2003

Posts: 650

boston, ma

W

winnie

Member

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

Joined: Jan 2004

Posts: 1,507

Michigan USA

G

George Little Offline

Member

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

Work Gear for Electricians and the Trades

Re: Feeder Size

#96986 01/11/06 10:25 PM

Joined: Jun 2004

Posts: 613

massachusetts

S

shortcircuit Offline

OP

Member

Thank you for the feedback...

shortcircuit

Re: Feeder Size

#96987 01/12/06 12:44 PM

Joined: Nov 2000

Posts: 2,148

IL

R

resqcapt19 Offline

Member

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

Joined: Jan 2005

Posts: 91

Spearfish, SD

H

Helectric

Member

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).]