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

    Oct 18, 2007, 06:02 PM
    Sizing parallel conductors
    On a 400 amp service for a commercial building. I'm trying to figure out the conductor size using parallel runs. I think 3/0 is sufficient but not sure. 3/0 is good for 225amps under the 90 degree column. Do you then multiply by 2 for 450 amps?
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Oct 18, 2007, 06:15 PM
    #3/0 is correct but not because of the 90 Deg C column, but it is rated 200 amps in the 75 Deg C column. Cannot use 90 D column unless the terminals are rated 90 D.

    So parallel #3/0 will be rated 400 amps.
    Washington1's Avatar
    Washington1 Posts: 798, Reputation: 36
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    #3

    Oct 18, 2007, 07:14 PM
    Seeing that you said 225A in the begin, we can assume you are using copper:)
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