Class 2 wiring UL fixture listing clash

[Strathead]

Here is the situation. I have some linear pendant fixtures to install with 0-10v dimming. The voltage is 277 volts. The drivers have a label that indicates they are class 2 power supplies. The white cord provided with the fixture is an SJTOW cord with 5 600 volt rated conductors in it. My belief is that this can't be wired as class 2 because there is no way to comply with 725.136 (someone can post that reference I don't have the electronic code). The main argument I am hearing is, "Fixtures have been installed this way all over the country. I understand that inside the fixture the wire can mix per UL, but I don't believe the cord and the junction box it terminates in to interface with building wiring is part of the UL listed fixture assembly. Opinions?

 

[hbiss]

It's fine. Run luminary MC to the J boxes or if running conduit pull 18/2 Type TC along with the 277 conductors.

-Hal

 

[Strathead]

Hal, what about the separation required by 725.136? It can't be maintained in the entire junction box.

 

[hbiss]

Doesn't have to be. Just keep the LV and line conductors as far apart as possible.

-Hal

 

[infinity]

Hal, what about the separation required by 725.136? It can't be maintained in the entire junction box.

You end up reclassifying the Class 2 condcutors as Class 1. They just have to be class 1 all the way you cannot mix Class 2 wiring say 18/2 cable in free air with the Class 1 wiring in the cord.

 

[Strathead]

You end up reclassifying the Class 2 condcutors as Class 1. They just have to be class 1 all the way you cannot mix Class 2 wiring say 18/2 cable in free air with the Class 1 wiring in the cord.

Infinity, that is my opinion, but the manufacturer, a common and quality one, is of the opinion that there lights are able to be wired as class 2. IMO, if the fixture is incapable of being wired as class 2, then first, the class 2 reference markings on the drivers should be removed and/or UL should require a label on the exterior of the fixture indicating its accepted wiring practices.

I am also hung up on the fact that this issue hasn't come up prior to this and a third rate hack (partial sarcasm, only partial) like myself is seeing it. Makes me wonder if I am missing something.

 

[augie47]

On first glance at 277v it does appear to be a violation. A bit odd as 715.136 will allow it asC lass 2 on circuits 150 volts to ground or less.