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    lowe210's Avatar
    lowe210 Posts: 1, Reputation: 1
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    #1

    Jan 21, 2012, 04:06 PM
    Wire Size and Breaker Size
    I am looking at a 125 ft run of cable to feed a branch circuit in an adjoining building. I have lots (490 ft) of left-over #2 copper cable from another project and a 125 Amp Cutler Hammer panel w/main disconnect that I could use. I have in the main house a 200 Amp Cutler Hammer panel.
    --Can I put in a large double-pole breaker in the main house panel to feed this branch circuit?
    --What is the largest breaker I should use in this main house panel for this branch circuit if I use the available #2 copper cable and the 125 amp panel?
    --Is this 125 amp panel OK or should I purchase a different one (if so what rating)?
    Brsmith135's Avatar
    Brsmith135 Posts: 16, Reputation: 1
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    #2

    Jan 21, 2012, 10:21 PM
    Use 125 amp panel. Feed with 80 amp breaker
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #3

    Jan 22, 2012, 04:58 AM
    Need to know what type of "#2 copper cable" you have.

    Certain #2 wire is rated 130 amps, that will allow a 125 amp branch breaker to be used.

    Not sure why an 80 amp breaker was suggested.
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