The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!


2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Son of Sparky
by HotLine1
Yesterday at 07:43 PM
Speaking of Plugmold ...
by gfretwell
10/17/16 02:37 PM
Broken battery charger? Check for cobwebs!
by gfretwell
10/17/16 02:30 PM
230 or 345 kV transmission lines?
by annemarie1
10/12/16 01:23 PM
Is this a fix or just a bandaid?
by gfretwell
10/10/16 06:49 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 11
renosteinke 6
HotLine1 6
ghost307 5
Potseal 4
Who's Online
1 registered (HotLine1), 241 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#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?

2014 / 2011 NEC & Related Books and Study Guides
#79220 - 12/07/01 10:03 AM Re: NEC 310.15 (B) (2) (a)
resqcapt19 Offline

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.

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

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.

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

Registered: 01/17/01
Posts: 78

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).

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


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).]


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals