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Thread: PV conductors run in attic

  1. #1
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    PV conductors run in attic


    Under 2011 code 690.31(E)(1) stated that wiring methods beneath a roof shall not be installed within 10in of roof deck…

    I can’t find any such code in the 2017 version. Has the implementation of 690.12 and rapid shut down systems deemed the 10in rule no longer a concern?


    Any clarification appreciated.



  2. #2
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    I think you are right that it's gone. I don't know the reason.

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    I'm aware of the rule that says you have to make sure your wiring under a roof deck needs to be out-of-the-way of any roofing nails that might be installed later... but 10" seems excessive.

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    Quote Originally Posted by PaulMmn View Post
    I'm aware of the rule that says you have to make sure your wiring under a roof deck needs to be out-of-the-way of any roofing nails that might be installed later... but 10" seems excessive.
    It was to allow firefighters to safely axe through a roof without fear or cutting into a 600VDC wire from roof mounted PV. Hence my wondering if the introduction of rapid shut down did away with this code.

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    The purpose was to protect firefighters and that was taken over by rapid shutdown so it was removed.

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    Is it acceptable to run PV DC in FMC in an attic?

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    Quote Originally Posted by five.five-six View Post
    Is it acceptable to run PV DC in FMC in an attic?
    Yes. 10 inches below the roofdeck under the 2014 NEC.

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