[RE-wrenches] current carrying conductor

Marco Mangelsdorf marco at pvthawaii.com
Thu May 13 22:23:58 PDT 2010


How about some clear definitions-for-dummies of 1) linear loads and 2)
non-linear loads?

 

marco

 

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

No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 9.0.819 / Virus Database: 271.1.1/2870 - Release Date: 05/13/10
08:26:00

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20100513/6aead3f9/attachment-0003.html>


More information about the RE-wrenches mailing list