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Thread: Class 2 Wiring....

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    Class 2 Wiring....

    I know we've discussed this before but it a bit fuzzy and I want to be clear.

    1. Class 2 wiring can't be run with power(600v) conductors. The only way to do this is re-classified them as class 1 and that entails removing all class 2 marking from power supplies etc.?
    2. Class 2 wiring can be run exposed(not enclosed in conduit) above hung ceilings?
    3. Class 2 wiring is rated for 150v?


    Interesting that this MC-PCS cable is allowed for class 1 and class 2 wiring method. I mentioned this a while ago but can't locate the post.

    https://www.southwire.com/products/35959.htm

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    When you have an MC job is great you can you the MC-PCS but what about when you have an all EMT job?? I was thinking the whips from the integral 0-10drivers could be the MC-PCS cable but then I'd be landing that cable in a common j-box and splicing the 120v and 0-10v in same box. Is that allowed even if I ran the class 2 0-10v free air and not in conduit from there?

    The triangle is the 0-10v wire and the circle is the 120v.
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    I don't know how legal I was but on LED retro fits with all conduit I pulled 16 AWG TFFN in the EMT and flex that served the lights.
    If you don't think too good, don't think too much.

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    Quote Originally Posted by ActionDave View Post
    I don't know how legal I was but on LED retro fits with all conduit I pulled 16 AWG TFFN in the EMT and flex that served the lights.
    Branch circuit taps for luminaires is legal, but need more details to know if what you did was legal. If entire branch circuit was run with 16 AWG, it probably wasn't legal, taps from the main circuit to individual luminaires with 16 AWG very possibly was legal.
    I live for today, I'm just a day behind.

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    Quote Originally Posted by mstrlucky74 View Post
    When you have an MC job is great you can you the MC-PCS but what about when you have an all EMT job?? I was thinking the whips from the integral 0-10drivers could be the MC-PCS cable but then I'd be landing that cable in a common j-box and splicing the 120v and 0-10v in same box. Is that allowed even if I ran the class 2 0-10v free air and not in conduit from there?

    The triangle is the 0-10v wire and the circle is the 120v.
    Just because it is 0-10 volt doesn't automatically mean this control loop is a class 2 circuit.
    I live for today, I'm just a day behind.

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    Quote Originally Posted by kwired View Post
    Just because it is 0-10 volt doesn't automatically mean this control loop is a class 2 circuit.

    I check the drivers and they are class 2.

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    Quote Originally Posted by kwired View Post
    Branch circuit taps for luminaires is legal, but need more details to know if what you did was legal. If entire branch circuit was run with 16 AWG, it probably wasn't legal, taps from the main circuit to individual luminaires with 16 AWG very possibly was legal.
    The TFFN was for the 0-10V dimming.
    If you don't think too good, don't think too much.

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    Quote Originally Posted by ActionDave View Post
    The TFFN was for the 0-10V dimming.
    Probably legal then. That should be a power limited control circuit and not branch circuit wiring.
    I live for today, I'm just a day behind.

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    So is it ok per code to run class 2 without conduit?

    Sent from my SM-N960U using Tapatalk

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    Quote Originally Posted by mstrlucky74 View Post
    So is it ok per code to run class 2 without conduit?

    Sent from my SM-N960U using Tapatalk
    725.3 Other Articles. Circuits and equipment shall comply
    with the articles or sections listed in 725.3(A) through (N).
    Only those sections of Article 300 referenced in this article
    shall apply to Class 1, Class 2, and Class 3 circuits.
    Does it say anywhere in article 725 that class 2 circuits require conduit?
    Bob

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