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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

    #2
    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.
    Attached Files

    Comment


      #3
      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 Billy Idol is on your playlist go reevaluate your life.

      Comment


        #4
        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.

        Comment


          #5
          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.

          Comment


            #6
            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.

            Comment


              #7
              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 Billy Idol is on your playlist go reevaluate your life.

              Comment


                #8
                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.

                Comment


                  #9
                  So is it ok per code to run class 2 without conduit?

                  Sent from my SM-N960U using Tapatalk

                  Comment


                    #10
                    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).
                    [COLOR="#FF0000"]Only those sections of Article 300 referenced in this article
                    shall apply to Class 1, Class 2, and Class 3 circuits.[/COLOR]
                    Does it say anywhere in article 725 that class 2 circuits require conduit?
                    Bob

                    Comment


                      #11
                      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 thought if it was listed equipment it pretty much did. And luminaires have to be listed.

                      Take a look at 725.121(A)(3) exception #2
                      Bob

                      Comment


                        #12
                        Originally posted by petersonra View Post
                        I thought if it was listed equipment it pretty much did. And luminaires have to be listed.

                        Take a look at 725.121(A)(3) exception #2
                        I have seen the dimming drivers with the dimming circuit marked as suitable for both Class 1 and Class 2 wiring.
                        Don, Illinois
                        (All code citations are 2017 unless otherwise noted)

                        Comment


                          #13
                          Originally posted by don_resqcapt19 View Post
                          I have seen the dimming drivers with the dimming circuit marked as suitable for both Class 1 and Class 2 wiring.

                          I looked at the fixture driver cuts and they are marked class 2.

                          Comment


                            #14
                            Originally posted by mstrlucky74 View Post
                            I looked at the fixture driver cuts and they are marked class 2.
                            Which means you can use class 2 wiring methods and other class 2 items on the circuit.

                            You also are allowed to reclassify it as class 1 and run the wires in same conduit as your power wiring, but that also means the entire control circuit gets reclassified as class 1. You can not mix and match things to suit your wants/needs once you do this.
                            I live for today, I'm just a day behind.

                            Comment


                              #15
                              I see nowhere in Section 725 that class 2 and 120v can’t be in the same box. Issue is I have 120v(in conduit) and class 2 dimming going to the same ballast/driver in a fixture. I’m bring the class 2 “free air” and the 120v

                              Scenario #1 – Have power conduit going directly into downlight box. Guess one could just bring in the 0-10v class 2 into a different ko on the box as it’s attached to the downlight.

                              Scenario #2- Tricky one. Would one need separate whips to separate j-boxes for the 0-10v class 2.?

                              Thanks.
                              Attached Files

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