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Thread: Panel Main Breaker

  1. #21
    Join Date
    Jan 2007
    Posts
    3,818
    Quote Originally Posted by ActionDave View Post
    First, you can't just add up breakers, that tells you nothing. If there is no information about the connected loads the NEC has formulas to calculate a loads.

    Second, the 200A breaker feeding the panel is protecting the conductors and panel, so a main breaker at the panel is redundant.
    That pretty well sums it up.

    JAP>

  2. #22
    Join Date
    Jan 2007
    Posts
    3,818
    As far as a single main being required for a panelboard, several things come into play before deciding whether only just one is needed or not.


    JAP>

  3. #23
    Join Date
    Aug 2018
    Location
    Pasadena, CA
    Posts
    5
    Quote Originally Posted by jap View Post
    He's not talking about that.

    He knows it needs a Main OCPD for the panel. He's talking about needing a 2nd main at a subpanel just because the ratings of the branch breakers exceed the rating of the panelboard.

    Not so.

    You don't count up the amperage that's printed on the face of the breakers, and, if it exceeds the panel rating throw a Main Breaker in for good measure.

    JAP>

    Thank you for the clarification

  4. #24
    Join Date
    Aug 2018
    Location
    Pasadena, CA
    Posts
    5
    Thank you all for your time

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