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Occ Sensor Control Wiring in same conduit with 277 volt lighting circuit?

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  • hbiss
    replied
    Originally posted by Lbartowski View Post
    ...unless it's in luminaire cable! I wonder how that is acceptable?
    It's acceptable simply because the cable manufacturer designed it as a factory assembly and got it listed.

    This doesn't at all mean that you can do the same thing yourself with raceway and line + LV !!

    -Hal

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  • GoldDigger
    replied
    Originally posted by Lbartowski View Post
    Right, but is luminaire cable really 2 separate raceways just because the control cable is jacketed? That logic would seem to allow me to pull a jacketed control cable (like an 18/3) within an EMT with 277 volt circuits then right?
    Right. If the control cable is a self-contained wiring method that does not require a raceway, it should be able to share the enclosing raceway. But without the explicit UL listing that luminaire cable has, an inspector may not agree.

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  • Lbartowski
    replied
    Right, but is luminaire cable really 2 separate raceways just because the control cable is jacketed? That logic would seem to allow me to pull a jacketed control cable (like an 18/3) within an EMT with 277 volt circuits then right?

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  • GoldDigger
    replied
    Originally posted by Lbartowski View Post
    ...unless it's in luminaire cable! [emoji38] I wonder how that is acceptable?
    That is acceptable because of the separate jacket around the Class 2 conductors.
    The argument is similar to the argument that two sets of wires, each inside their own EMT or Smurf tube, do not create a violation when those two raceways are run through a common enclosing raceway.

    Sent from my XT1585 using Tapatalk

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  • Lbartowski
    replied
    ...unless it's in luminaire cable! I wonder how that is acceptable?

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  • infinity
    replied
    Originally posted by Johnhall30 View Post
    You can put low voltage wiring in the same condiut as power conductors as long as the low voltage wiring is rated for 600V (i.e. you could use some #14 THHN)

    That's a common misconception, Class 2 circuits that cannot be reclassified as Class 1 cannot be in the same raceway regardless of the voltage rating of the conductors.

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  • hbiss
    replied
    Originally posted by Johnhall30 View Post
    You can put low voltage wiring in the same condiut as power conductors as long as the low voltage wiring is rated for 600V (i.e. you could use some #14 THHN)
    That is not correct.

    -Hal

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  • Johnhall30
    replied
    You can put low voltage wiring in the same condiut as power conductors as long as the low voltage wiring is rated for 600V (i.e. you could use some #14 THHN)

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  • infinity
    replied
    The LV occupancy sensors that we install are Class 2 so their conductors cannot go in the same raceway as the power conductors. Some 0-10 volt lighting control can be reclassified as Class 1 and occupy the same raceway as the power conductors.

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  • Lbartowski
    replied
    Sorry....for clarification...I believe the 0-10v dimming conductors are considered class 2 circuits. My previous post said class 1.

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  • Occ Sensor Control Wiring in same conduit with 277 volt lighting circuit?

    I understand that if it's 0-10v dimming circuit, it's considered class 1, and needs to be separate from power conductors....but how about the "low voltage" control conductors going to an occupancy sensor?
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