Dimable LED Fixtures

[augie47]

I have been asked a question about a lighting system on which I have limited information.
My understanding is that this is a listed lighting system. The fixtures are LED, and, I understand the supply wires to the fixture are 120v.
The supply is controlled by a "dimming panel" and there is also a low voltage cable from the panel to each fixture.
The contractor wants to install the low voltage cable in the same raceway as the line conductors.
As I say, I am short on info, but from what I've been told the LV is Class 2.
My opinion based on the limited info is that the cables can not share the same raceway.
Is anyone familiar with such a lighting system ? Opinions on mixing
the cables are appreciated.

 

[Dennis Alwon]

Not familiar with the system but I would agree that they cannot occupy the same raceway-- as you know art.725.136(A) tells us so.

 

[infinity]

I agree with your assessment that they cannot occupy the same raceway. It might be permissible to install the control wiring as Class 1 in the same raceway but then you would need to follow the Class 1 rules in Article 725. Here's some info from Lutron on using Class 1 or Class 2 control. Page 26.

http://www.lutron.com/TechnicalDocumentLibrary/366-606_FDS_TG.pdf

 

[iwire]

Perhaps he wants to take advantage of ..

725.130(A)Exception No. 2: Class 2 and Class 3 circuits shall be
permitted to be reclassified and installed as Class 1 circuits
if the Class 2 and Class 3 markings required in 725.124 are
eliminated and the entire circuit is installed using the wiring
methods and materials in accordance with Part II,
Class 1 circuits.

(2008 NEC)

 

[augie47]

Thanks guys, I'll pass it along.

 

[tom baker]

725.130(A)Exception No. 2: Class 2 and Class 3 circuits shall be permitted to be reclassified and installed as Class 1 circuits
if the Class 2 and Class 3 markings required in 725.124 are eliminated and the entire circuit is installed using the wiring
methods and materials in accordance with Part II, Class 1 circuits.

But does not changing the markings on the power supply from Class 2 to Class 1 void the product (UL) listing?