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Thread: sub panel main breaker

  1. #11
    Join Date
    Feb 2016
    Quote Originally Posted by LarryFine View Post
    I would say that detached is defined as not attached. Having to go outside to another door is no different than going to another room inside, in my opinion.
    I tend to agree. The reason I brought this up is the following case (my residence):

    I have a pool house with a 100A MLO panel with 16 spaces, 10 used. The pool house is 20 feet from my house where the feeder originates. A brick wall on my house extends away from the house and 20 feet later, it becomes a wall of the pool house.

    By this definition, they are indeed attached. And that what the pool installer who put in the panel told me when I asked him about it. He is a licensed EC.

    I just look at it subjectively and wonder if it meets the intent of the rule!!??

  2. #12
    Join Date
    May 2005
    Richmond, Virginia
    In this instance, I would have to say that the brick wall does not qualify the two structures as attached. A properly-secured back-fed breaker would suffice.
    Code references based on 2005 NEC
    Larry B. Fine
    Master Electrician
    Electrical Contractor
    Richmond, VA

  3. #13
    Join Date
    Apr 2006
    Springfield, MA, USA
    Arguably if you have a feeder between 2 structures you have attached them ( tongue firmly in cheek)

    At some point the cost of a common mass produced panel with a main breaker is cheaper than the cost of figuring out if you have a detached structure or not. IMHO the brick wall that retirede describes ties the two buildings into a single structure, but this misses the intent of the code.

    Along the same vein but going in the opposite direction: If you have a pole mounted panel a couple of feet away from the building served, IMHO they are technically separate structures but per a common sense understanding of the code should be considered one structure.

    Back to the OP, you are only permitted a single feeder (with some exceptions) to a detached structure, and must have a disconnect at the detached structure. I agree with what others have said: the inspector was correct in requiring a main disconnect, but incorrect in requiring a 50A breaker when a 100A breaker would serve as that disconnect.


  4. #14
    Join Date
    Dec 2007
    NE Nebraska
    Quote Originally Posted by winnie View Post
    Arguably if you have a feeder between 2 structures you have attached them ( tongue firmly in cheek)
    Well with that kind of approach - everyone tied to public grid is all part of one really big structure.

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