Re: [RE-wrenches] current carrying conductor

[William Miller]

Marco:

Will non-linear loads be expected?  If so, the neutral is considered to be 
a current carrying conductor and needs to be counted.  If no non-linear 
loads, then the neutral is not counted.

Code citation below (2008):

310.15(4) Neutral Conductor.
(c) On a 4-wire, 3-phase wye circuit where the major
portion of the load consists of nonlinear loads, harmonic currents
are present in the neutral conductor; the neutral conductor
shall therefore be considered a current-carrying conductor.


William Miller

PS:  Who's buying dinner, you or your partner?

Wm



At 09:17 PM 5/13/2010, you wrote:
Content-Type: multipart/alternative;
        boundary="----=_NextPart_000_02F9_01CAF2C8.8607F590"
Content-Language: en-us

xmlns:ns0="urn:schemas-microsoft-com:office:smarttags">
Thanks for sending that link, William.

OK…let’s try it from a different perspective.

When you’re running, say, three three-phase hot conductors from point A to 
point B with a neutral conductor, should that neutral be considered 
“current carrying” from the perspective of more than three “current 
carrying” conductors in a raceway?  And thereby necessitating de-rating 
the current carrying capacity of the hot conductors?

marco
_______________________________________________
List sponsored by Home Power magazine

List Address: RE-wrenches@lists.re-wrenches.org

Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out participant bios:
www.members.re-wrenches.org