0-10V dimming wire outside the raceway

[marcosgue]

Hello, I'd like to know if can I run 0-10V dimming wires outside the conduits branch circuits and which are the requirements for these wires and how to support them.
Thanks for some clarifications

 

[Kansas Mountain]

Yes, 0-10V wiring can be ran separate from the line voltage conductors, and the 0-10V conductors do not have to be within a raceway. No requirement by NEC to support them. Cable manufacturer requirements or TIA/EIA may apply if enforced in the jurisdiction.

 

[marcosgue]

ok thanks you and what type of cable is better to run 0-10v dimming wires outside the conduit?

 

[don_resqcapt19]

Assuming the 0-10 volt control is a Class 2 circuit, 300.11(C)(2) permits you to secure the cable to the raceway that contains the power for the controlled circuit.
As far as the code requiring the cable to be supported, see 725.24., and remember that cables installed above a lay-in ceiling are exposed for the purposes of the NEC.

 

[Kansas Mountain]

Assuming the 0-10 volt control is a Class 2 circuit, 300.11(C)(2) permits you to secure the cable to the raceway that contains the power for the controlled circuit.
As far as the code requiring the cable to be supported, see 725.24., and remember that cables installed above a lay-in ceiling are exposed for the purposes of the NEC.

I was thinking along the lines of how often does it have to be supported. Thanks for the correction, definitely a much better answer.

 

[marcosgue]

The 0-10V free wire dimming is required to be shielded or can I use whatever #18/2? Which one is the better option?Thanks

 

[paulengr]

The 0-10V free wire dimming is required to be shielded or can I use whatever #18/2? Which one is the better option?Thanks

There is no “requirement” for shielding on any signal cable but that does not mean it’s not a good idea if you have concerns about electromagnetic interference. I’d be less inclined to worry about lighting circuits compared to others. It may be a reason to consider twisted pair cable. With twisted pair any electrical field that passes a cable inducing a voltage on a half twist also induces the opposite polarity on the next half twist and the two cancel each other out.

Since it is communication cable, the usual #18 minimum does not apply. Often I see telephone cable (4 conductor), alarm/security cable (2-4 conductors) or even CAT 5 used because they are all inexpensive and get the job done. The whole key to understanding signal cables is that they fall in chapter 7. Power cables follow everything in chapters 1-3 except where the rules are modified for special equipment in chapter 4 or special locations under chapters 5 and 6. With chapter 7 you ignore chapters 1% unless it is specifically called out in chapter 7.

 

[marcosgue]

above drop ceiling run a cable tray with many power cables and that's the reason that I'm considering shielded cable to minimize the electromagnetic interference. Thanks for all your responses

 

[Fulthrotl]

above drop ceiling run a cable tray with many power cables and that's the reason that I'm considering shielded cable to minimize the electromagnetic interference. Thanks for all your responses

well, 0-10 dimming is using a voltage that you are trimming with a rheostat to control the light output.
it's analogue. RF noise isn't gonna make much of a difference. shielded cable has to have one end
grounded to have much of an effect. grounding both ends largely negates the shield. grounding no
ends has a similar result.

 

[marcosgue]

Thanks you for your advice, I'll take care off it, we already bought the 0-10V cable