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Thread: PVC use indoors

  1. #11
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    Quote Originally Posted by raberding View Post
    probably not allowed in plenums
    The meaning of the word plenum is a little confusing.

    To clarify, no wiring that is not directly necessary for the functionality of the air handling system is allowed in physically constructed ducts or plenums. Examples of such wiring are air temperature/speed sensor wiring or fan power/control wiring, that has no other option other than to be in the physically constructed duct/plenum. To contrast with physically constructed plenums, a plenum space, built with building walls and ceilings instead of duct walls, is where you either need a metal wiring method, or plenum-rated cable.

  2. #12
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    Quote Originally Posted by A/A Fuel GTX View Post
    A good percentage of them are for venting and have no liquid in them.

    j
    Just methane gas
    CircuitRyder --- Unfortunately not all good ideas are code enforceable.

  3. #13
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    Quote Originally Posted by Carultch View Post
    The meaning of the word plenum is a little confusing.

    To clarify, no wiring that is not directly necessary for the functionality of the air handling system is allowed in physically constructed ducts or plenums. Examples of such wiring are air temperature/speed sensor wiring or fan power/control wiring, that has no other option other than to be in the physically constructed duct/plenum. To contrast with physically constructed plenums, a plenum space, built with building walls and ceilings instead of duct walls, is where you either need a metal wiring method, or plenum-rated cable.
    I think 300.22(B) & (C) makes it clear that PVC is not permitted in ducts and other spaces used for environmental air (plenums).

    I was trying to see about inside walls, etc.
    Ron

  4. #14
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    Quote Originally Posted by ron View Post
    I think 300.22(B) & (C) makes it clear that PVC is not permitted in ducts and other spaces used for environmental air (plenums).

    I was trying to see about inside walls, etc.
    I think that the determining characteristic would not be residential versus commercial, but rather the building construction type required for the specific building occupancy.

  5. #15
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    Quote Originally Posted by GoldDigger View Post
    I think that the determining characteristic would not be residential versus commercial, but rather the building construction type required for the specific building occupancy.
    I know that exists for NM cable, but couldn't find that for PVC
    Ron

  6. #16
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    I don't think it is there.
    There may be contract terms requiring a metallic raceway or cable though.

    Sent from my XT1585 using Tapatalk

  7. #17
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    I dont see a reason why RPVC couldnt be used indoors. Ive run many a thousand of feet of ENT for comm cable, tho it's not permitted in an air handling space (300.22?).
    Electricians do it until it Hertz!

  8. #18
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    IMO PVC conduit inside, exposed (above a suspended ceiling) just looks sloppy, and too much like a DIY job. 3/4" PVC has to be supported every 3 feet, 1 foot from a box. EMT is faster to install, and not EGC is required.
    Typically you'll see MC cable or a mix of MC and emt
    Moderator-Washington State
    Ancora Imparo

  9. #19
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    Quote Originally Posted by GoldDigger View Post
    I don't think it is there.
    There may be contract terms requiring a metallic raceway or cable though.

    Sent from my XT1585 using Tapatalk
    Luckily I write the Contract terms. 😀
    Ron

  10. #20
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    Quote Originally Posted by tom baker View Post
    IMO PVC conduit inside, exposed (above a suspended ceiling) just looks sloppy, and too much like a DIY job. 3/4" PVC has to be supported every 3 feet, 1 foot from a box. EMT is faster to install, and not EGC is required.
    Typically you'll see MC cable or a mix of MC and emt
    3/4 PVC can be up to 3 feet from box to first support as a general rule, and every 3 feet afterward.

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