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Thread: Minimum Service Size

  1. #11
    Join Date
    Dec 2007
    Location
    NE Nebraska
    Posts
    36,739
    Quote Originally Posted by electrofelon View Post
    Because we like to debate theoretical code situations
    Bigger is better has more room for interpretations and should allow for endless debating
    I live for today, I'm just a day behind.

  2. #12
    Join Date
    Jul 2007
    Posts
    356
    Quote Originally Posted by Dennis Alwon View Post
    230.79 is what you are looking for

    230.79 Rating of Service Disconnecting Means. The service
    disconnecting means shall have a rating not less than the calculated
    load to be carried, determined in accordance with
    Part III, IV, or V of Article 220, as applicable. In no case shall
    the rating be lower than specified in 230.79(A), (B), (C), or
    (D).
    (A) One-Circuit Installations. For installations to supply only
    limited loads of a single branch circuit, the service disconnecting
    means shall have a rating of not less than 15 amperes.
    (B) Two-Circuit Installations. For installations consisting of
    not more than two 2-wire branch circuits, the service disconnecting
    means shall have a rating of not less than 30 amperes.
    (C) One-Family Dwellings. For a one-family dwelling, the service
    disconnecting means shall have a rating of not less than
    100 amperes, 3-wire.
    (D) All Others. For all other installations, the service disconnecting
    means shall have a rating of not less than 60 amperes.
    Thank you for the info.

    So If my main service disc. is at the main house service panel and a dwelling unit is fed off a branch breaker on the house service panel, then can we call this branch breaker the dwelling unit service disconnect?

    Thanks

  3. #13
    Join Date
    Dec 2007
    Location
    NE Nebraska
    Posts
    36,739
    Quote Originally Posted by Designer69 View Post
    Thank you for the info.

    So If my main service disc. is at the main house service panel and a dwelling unit is fed off a branch breaker on the house service panel, then can we call this branch breaker the dwelling unit service disconnect?

    Thanks
    It is no longer service conductors/equipment and 230 doesn't apply. It is now a feeder.

    If the dwelling in question is in a separate building there is still similar requriements in 225.39. If dwelling is within the same building there is no minimum feeder size other then you need to be able to handle the calculated load.
    I live for today, I'm just a day behind.

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