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Thread: Additional sub panel

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  1. #1

    Default Additional sub panel

    My house has a 200 amp service with an exterior cutoff panel adjacent to the meter base. Breaker 1 is 70 amps for exterior AC/Heating circuits. Breaker 2 is 90 amps and controls the interior load center/subpanel.

    According to the 2002 NEC load calc, I currently require 80 amps available from the existing 90 being fed to the interior load center.

    I got an electrical permit (based on 2002 NEC), and am starting to wire an addition which includes master bedroom, bathroom, laundry, kitchen expansion. Can I add a third breaker to the exterior cutoff panel/load center and run a new SER, 4 wire cable cable to a new subpanel? The addition needs approx 40 amps. Should I use #4 copper for a 50' run through a crawl space?

  2. #2
    Licensed Electrical Contractor Speedy Petey's Avatar
    Join Date
    Jun 2007
    Location
    NY State, USA
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    975

    Default

    If the addition needs 40A @ 240v then you can run #6 cable from a 50 or 60A breaker. You can also run the #4cu to a panel off a 100 or 90A breaker.
    Answers based on the 2008 & 2011 NEC. If you're on the '14 already I feel sorry for you.

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