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Thread: Main or sub

  1. #1
    cglochau's Avatar
    cglochau Guest

    Default Main or sub

    Here is the situation 2 houses same property ones a rental. Service entrance at house 1, 125amp breaker in the panel goes to the panel for house 2. At house 2 there is a personal service meter (rental) right before the panel. I'm not sure if this is a main panel because of the service meter or is it still a sub? There is no main disconnect at house 2 panel with more than 6 breakers but it is bonded. Which one do I call out?

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  2. #2
    cglochau's Avatar
    cglochau Guest

    Default Re: Main or sub

    Sorry I meant the neutral bus is bonded.


  3. #3
    Robert Meier's Avatar
    Robert Meier Guest

    Default Re: Main or sub

    The panel at the rental unit, by NEC definition, is not a service and a disconnecting means is required. A few things come into play, when was this installed and under what code? Are there any metallic paths between the two structures? Does the rental unit have it's own GES or grounding electrode system?


  4. #4
    cglochau's Avatar
    cglochau Guest

    Default Re: Main or sub

    It is a 1920 upgraded in 2005. There are no visible metallic paths. It does not appear to have its own GES.


  5. #5
    Join Date
    Aug 2008
    Location
    Maryland
    Posts
    1,899

    Default Re: Main or sub

    Some utilities will only allow one service per lot.

    All answers based on unamended National Electrical codes.

  6. #6
    Join Date
    Oct 2011
    Location
    Eastern Shore of MD, NEC 2008
    Posts
    94

    Default Re: Main or sub

    All structures, with a few exceptions, require a GES.

    A 3 wire feed with a rebonded neutral may have been legal at the time, 2005 NEC, but a GES would have still been required.


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