switch loop?

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bill@usps06492

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Is it okay to bring a live feed into a flourescent ballast canopy and wire a switch loop out of it?? I have two short lenghts of wire. One reaches from the light fixture to the box and the other goes from the same light to the switch that is already in the wall. Can grab the 120v feed near the light fixture and use the light as a junction point. It's a commercical location, I'm using MC cable, and these are drop in troffers. I didn't see anything in Art 410 on this.
Bill
 
As long as there's room (cubic inches) in the canopy, I don't see why not. There's usually bazillions of cubic inches in those things anyway.
 
I agree with 480,
The canopy could be used as a Jbox based on cubic inches required for the wire count.

At my job:
This discussion has come up regarding using a Load Center box as a junction box.
This discussion has come up when we tried to pass a circuit through a Load Center box.
This discussion has come up when we needed to make joints in a condulet ('T').

In both cases I referred to NEC
where it states that the only requirement for joint making
is the cubic inches required for heat.

I have some refresher reading to do, before I comment any more on this.
I am still trying to make a good case for relating / differentiating:
(1) Chapter 9 (Jam Factor)
(2) 310.15 (Heat Factor)
(3) Joint Making (Cubic Inches).

Any comments are welcome.

...
 
I think that joints in a condulet is one of those trick questions. It has to be "durably and legibly mark with their volume" 314.16 (C) 2 You have to make sure you have enough volume.
 
Steve,
You are exactly right.
I do use the manufacturer's marks on new installations.

On the other hand,
when faced with a tough fix on an old installation,
where volume was not not marked,
I have been known to measure the volume.

...
 
But, does a condulet need to be marked for a device to be installed in it?

Roger
 
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