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Thread: 120% RULE adding PV to a loadcenter

  1. #11
    Join Date
    Sep 2010
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    189
    Interesting way to look at it. Thanks for the input.

  2. #12
    Join Date
    Feb 2006
    Location
    Jersey
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    1,334
    Quote Originally Posted by don_resqcapt19 View Post
    No. The rule permits the total rating of all of the breakers that can feed power into the panel bus to exceed the bus rating by 20%. If the panel bus is rated at 150 amps you are permitted to add a 30 amp breaker that is fed from interconnected power production equipment.
    Quote Originally Posted by crazedengineer View Post
    Opps, Don you are right.

    The great and powerful Oz.

    Just an electrician??? I think not.
    " I'm at a crucial part of my painting "...........Monika Danneman

  3. #13
    Join Date
    May 2011
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    1,230
    Quote Originally Posted by don_resqcapt19 View Post
    I would see that as a supply side connection and would permit the PV breaker to equal the rating of the service.
    I concur with Don. And for the record, so have a number of AHJs in whose jurisidictions I've worked in with this type of scenario.

    Note that in this scenario, adding the PV cannot result in the loads drawing more power. Thus if the busbar and service are properly rated for the loads, adding the PV cannot result in overloading the bus or service any more than drawing from the utility can. The scenario is different from a load side connection, where overloading may be possible due to a load factor applied to the main breaker.

  4. #14
    Join Date
    Jun 2012
    Location
    Oregon, US
    Posts
    32
    I would use the largest main, one of the 150amp breakers in this instance, which would leave up to a 150amp PV breaker. Even though there is no Main disconnect for the buss, there are still 6 mains for the service, which are installed on the buss.

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