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Thread: lightning protection down conductor

  1. #1
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    lightning protection down conductor

    Can a bare copper lightning protection conductor be routed exposed in a return air plenum between the roof penetration and a PVC conduit routed from the ceiling to the grounding electrode below ground? Does this violate NEC 300.22C?

  2. #2
    Join Date
    Apr 2010
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    Lightning protection conductors have a special cable construction................if you are under any jurisdiction you would have to use it.me thinks.

    dick

  3. #3
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    I don't really like lightning protection conductors inside the building, but NFPA does permit them to be inside the building. There are rules that require any metal object within 6' to be bonded to the lightning protection conductor.

    The lightning protection conductors are normally bare and if that is the case I see no reason why they can't be installed in a 300.22(C) space.
    Don, Illinois
    "It is the first responsibility of every citizen to question authority." B Franklin

  4. #4
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    * * * *

    Rob11,

    Is the bare copper conductor and the pvc piping rated AND labeled for
    this installation [ RE: Section 602.2.1.1 in the `06 IMC ] ?.....If not,
    then "no install" in the plenum.


    + + + +

  5. #5
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    Quote Originally Posted by north star View Post
    * * * *

    Rob11,

    Is the bare copper conductor and the pvc piping rated AND labeled for
    this installation [ RE: Section 602.2.1.1 in the `06 IMC ] ?.....If not,
    then "no install" in the plenum.


    + + + +
    The bare copper is inside the duct and the PVC is the raceway external to the duct, 602.2.1.1 does not apply.

  6. #6
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    "Can a bare copper lightning protection conductor be routed exposed in a return air plenum... "
    My bad!....Section 602.2.1.1 applies only to "combustible" electrical
    methods and materials........Gregg Harris is correct!


    + + + +
    Last edited by north star; 08-10-12 at 12:58 PM.

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