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Thread: City Plan Checker Blues

  1. #11
    Join Date
    May 2011
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    Quote Originally Posted by JMW77 View Post
    ...It would be nice if I could get a reasonable explanation on why this is necessary. ...
    Give up on that. It isn't necessary and as you mentioned the requirement has been removed from the 2017 NEC. But if you're in California on the 2016 CEC and he's citing 690.47(D) then yeah, you're just kinda gonna have to deal. A bare #6 to a ground rod would be acceptable by the code.

  2. #12
    Join Date
    Nov 2015
    Location
    CA, USA
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    515
    I think you might be going about this from the wrong direction, the NEC will not say if an Enphase micro-inverter requires a GEC. That comes from the installation manual. If the installation manual says the inverter design requires a GEC then the NEC provides direction on sizing it, if it does not call for a GEC then one is not needed. And those micro-inverters do not require a GEC. So that side of the argument is closed by referring to the manual.

    Since everything gets an EGC and this is AC that is sized by NEC table 250.122.

    Now if you are dealing with a 2014 NEC 690.47(D) issue then you are farther from a resolution. I've found that exception 2 can almost always be invoked since you can usually show that an additional grounding electrode that satisfied 47(D) could be installed within 6' of the existing grounding electrode system.
    Last edited by pv_n00b; 04-10-18 at 12:09 AM.

  3. #13
    Join Date
    Oct 2009
    Location
    Austin, TX, USA
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    Quote Originally Posted by pv_n00b View Post

    Now if you are dealing with a 2014 NEC 690.47(D) issue then you are farther from a resolution. I've found that exception 2 can almost always be invoked since you can usually show that an additional grounding electrode that satisfied 47(D) could be installed within 6' of the existing grounding electrode system.
    Not if the electrical service is on the north side of the house. That was the situation in the one and only time an inspector held my feet to the fire over 690.47(D).

  4. #14
    Join Date
    Nov 2015
    Location
    CA, USA
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    Quote Originally Posted by ggunn View Post
    Not if the electrical service is on the north side of the house. That was the situation in the one and only time an inspector held my feet to the fire over 690.47(D).
    Almost always. It's the few exceptions that get you.

  5. #15
    Join Date
    Jan 2012
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    CA
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    502
    Quote Originally Posted by pv_n00b View Post
    Almost always. It's the few exceptions that get you.
    I cannot know what is in the inspector's mind.
    Also, I don't know how long you have been in the solar industry.
    So, let me just say that for years a big fat #8 or #6 combined EGC/GEC was standard in all Enphase systems.
    The inspector might not be able to let this memory go and thus insists on using all sorts of other code justifications, because it just doesn't look right.

    And let's be fair, his job is to be safety minded and cautious. So he is erring HARD on the side of caution here.

    (for example......I remember seeing some new methods from other guys and was doubtful...turns out it is allowed.)

    It has been YEARS since I busted out the spool of #8 green!

    Will it pay off? I dunno. But HOW you say it and discuss it with him will make all the difference.
    Ask more than you state.

    And be ready to accept a loss. They are the authority and ultimately can demand what they want, by force of law, simply because....well, they are the authority.
    I have pushed back politely and gently and had resolution before.
    One or two other times, inspectors went ballistic.
    It'll be fun either way.

    Keep us posted.

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