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#79219 - 12/07/01 09:42 AM NEC 310.15 (B) (2) (a)
mdsmith Offline
Junior Member

Registered: 12/07/01
Posts: 5
When you install 120V, single phase circuits in a raceway, each with a separate neutral, do you count the neutrals when applying the provisions of 310.15(B)(2)(a)? or does 310.15(B)(4)(a) apply to this situation?

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#79220 - 12/07/01 10:03 AM Re: NEC 310.15 (B) (2) (a)
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
Each neutral carries the same current at the associated phase conductor and therefore must be counted as current carrying conductors.
Don(resqcapt19)
_________________________
Don(resqcapt19)

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#79221 - 12/07/01 02:43 PM Re: NEC 310.15 (B) (2) (a)
Steve Miller Offline
Member

Registered: 08/30/01
Posts: 322
Loc: Loudoun Cty, VA
In a word... yes. If you have a shared neutral on a single phase multiwire circuit it would not count.

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#79222 - 12/08/01 04:47 AM Re: NEC 310.15 (B) (2) (a)
Glenn Offline
Member

Registered: 01/17/01
Posts: 78
Steve,

Isn't that on linear loads?

Non-linear loads using a multiwire method ( N-A-B-C ), the neutral is considered a current carrying conductor. 220-22 FPN#2, 310-15(b)(4)(c).

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#79223 - 12/08/01 09:10 PM Re: NEC 310.15 (B) (2) (a)
electure Offline

Member

Registered: 12/24/00
Posts: 4226
Loc: Fullerton, CA USA
Absolutely. Each neut carries the full load.

[This message has been edited by electure (edited 12-09-2001).]

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