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    Grandmasterc's Avatar
    Grandmasterc Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Mar 3, 2010, 10:02 AM
    Do I need a main breaker for A panel?
    I have a main disturbution panel that feeds a panel in a new addition. The panel is a 3phase 480v and has 12 circuit breakers in it. My understanding is that since there is more than 6 it has to have a main breakers or switch to kill power in case of emergency. Since it have a main disconnect in the disturbution panel does it need one at the panel? The two panels are about 400ft apart.
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #2

    Mar 3, 2010, 02:32 PM

    As long as the sub-panel is in the same building as the MDP it does not need a main breaker. This is a very typical installation.
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