Page 2 of 2 FirstFirst 12
Results 11 to 14 of 14

Thread: 120% RULE adding PV to a loadcenter

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

  2. #12
    Join Date
    Feb 2006
    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
    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
    Oregon, US
    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.

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts