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Posted by Toller on November 13, 2007, 2:47 pm
>
>> Is this acceptable practice to have 2 potential hots in a cable and
>> no common? (cable#2 in the text).
>
> My understanding of the US 2002 NEC is that this is allowed for
> non-metallic sheath cables as long as all current-carrying conductors
> of a single circuit enter or leave any ferrous boxes through the same
> hole. See 300.3(B)(3).
>
>> I've seen 12/2/2 but i believe that contains two commons.
>
> My understanding of the US 2002 NEC is that a white insulated
> conductor in a cable can be used as an ungrounded conductor ("hot") if
> you reidentify with another color at every termination and point at
> which it is accessible. See 200.7(C)(1).
>
> As to your layout, if I understand correctly the physical situation is
> as follows:
>
> Kitchen door Ceiling fan Backdoor
> 2 way fan switch Light 3 way light switch
> 3 way light switch
> Incoming power here
>
> If this is correct, you need 4 conductors (plus EGC) from the Kitchen
> door to the Ceiling fan (neutral, fan hot, two travelers for the
> light)
two travelers for the light? The light and the fan each have terminals for
a hot and a neutral; where exactly are you going to attach two travelers?
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