Residential heat-vent-light cabling

[tkb]

I usually do commercial and industrial wiring, but I have to install a heat-vent-light w/night light in my mothers house.

This requires 4 hots, 1 neutral and a ground from the switches.

What is the normal practice for wiring this fixture?

Since there in no such thing as 12-5 NM cable, is using 2 cables, one 12-3 NM and one 12-2 NM acceptable?

This would mean that the neutral would be used in one cable, the other white would be reidentified and there would be 2 groung wires from the switches to the fixture.
Wiring diagram

Is this correct, or is there another way?

Thanks

 

[physis]

Re: Residential heat-vent-light cabling

The neutral is common to all four loads?

Edit: You could just use two cables and if you keep them together you wont have an EMF issue.

[ November 08, 2004, 11:09 AM: Message edited by: physis ]

 

[tkb]

Re: Residential heat-vent-light cabling

Yes, all four use the same neutral.

I don't think it's a problem with 2 cables, I was just asking if there is a diferent way.

I have some TC tray cable 6 conductor #12. Can type TC be used in a dewling unit? It seems that you could use it almost anywhere else.

 

[hbiss]

Re: Residential heat-vent-light cabling

Good question as to whether type TC can be used as type NM. Looks like 336.10(2) and 336.12(2) would prohibit it.

I have always wired these things with a 12/2 and a 12/3 as you suggest.

-Hal

 

[physis]

Re: Residential heat-vent-light cabling

EMT?

 

[peter d]

Re: Residential heat-vent-light cabling

I have found that ENT (smurf pipe) and a deep 5S box with 1 or 2 gang plater ring (depending on the control configuration) is the best solution for this, assuming this is new work.

Stranded #12 THHN is easier to use than the solid in the romex, especially in the cramped j-box on the heat/fan units.