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

    Apr 4, 2012, 06:40 PM
    3 phase 208 volt panel 11000 kw what size breaker to use
    I have a 3 phase 208 volt 11kw oven. What size breaker should I use.
    Is it 208/11000 which would be 50 amp
    Or 240/11000 which is 45 amp.
    Current power source is 208 volts and currently has # 6 wire
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Apr 5, 2012, 02:43 AM
    If in the USA, the breaker and feeder needs to be rated 25% higher than the load.

    11000 watts / (208 * 1.73) = 30.5 Amp load * 1.25 = 38.125 amp circuit rating.

    A 3 pole 40 amp breaker using the existing #6 wire will work fine.
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