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    #16
    Originally posted by mstrlucky74 View Post
    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.
    If 0-10V is indeed class 2 they must be in separate wiring methods or a listed assembly that effectively separates the two circuits per the listing.

    If it is class 2 circuit that has been "reclassified" then it is no longer a class 2 circuit. But that means the entire circuit becomes class 1, you can't throw in class 2 cabling or devices wherever you decide is convenient.

    More common example over the years of this is HVAC thermostat wiring. If you decided to reclassify the control circuit as class 1 circuit to be able to run thermostat wiring with the supply power wiring - you can't run typical 18 ga thermostat cable in the raceway, it would have to be 300 or 600 volt conductors. You also can not connect it to typical 24 volt class 2 rated wall thermostat - it would have to be a thermostat rated for line voltage since it is not a class 2 circuit even though it is still 24 volts.
    I live for today, I'm just a day behind.

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      #17
      So spoke to engineer yesterday and he said you can combine class 2 with 120v power wiring if the class 2 insulation id rated for 600v. I've heard of this before but thought there was a caveat. Maybe it's the reclassifying if you do this???

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        #18
        Originally posted by mstrlucky74 View Post
        So spoke to engineer yesterday and he said you can combine class 2 with 120v power wiring if the class 2 insulation id rated for 600v. I've heard of this before but thought there was a caveat. Maybe it's the reclassifying if you do this???
        You must use insulation rated for highest voltage present in the cable/raceway. Normally you are using 600 volt rated conductors, with 120 volt power circuit being present you only would be required to have 120 volt insulation - though something rated either 300 or 600 volts will be much more common to come up with.

        You also still must "reclassify" the entire class 2 circuit. That means you can't just run 600 volt conductor where you wish to run with power conductors, you must also land in devices rated for class 1/power applications.

        See 725.130 exception 2 and informational note that follows.
        I live for today, I'm just a day behind.

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          #19
          Originally posted by kwired View Post
          You must use insulation rated for highest voltage present in the cable/raceway. Normally you are using 600 volt rated conductors, with 120 volt power circuit being present you only would be required to have 120 volt insulation - though something rated either 300 or 600 volts will be much more common to come up with.

          You also still must "reclassify" the entire class 2 circuit. That means you can't just run 600 volt conductor where you wish to run with power conductors, you must also land in devices rated for class 1/power applications.

          See 725.130 exception 2 and informational note that follows.
          Thanks, I thought so.

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