[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:
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>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
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