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    guyhood's Avatar
    guyhood Posts: 15, Reputation: 1
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    #1

    Mar 7, 2007, 08:40 AM
    Adding tandem breakers for additional circuits
    I am hooking up a 15kw generator with auto transfer switch to a 200 amp service house.
    The transfer switch has two 240 circuits available, along with 5, 15 amp circuits, and 3, 20 amp circuits. I am trying to decide how to use the 240v circuits. 1)Kitchen oven, 2)Laundry dryer, or just not hook up the dryer (high wattage), and use the 240 circuits for more 15 amp circuits - which I need. Replacing the 240 volt breaker with two tandem 15amp breakers (for four circuits) is what I had in mind. The transfer switch is fed by a 70amp breaker from the main service panel during normal power.
    I really appreciate the answers I have received from this site on my past postings.
    Thank you,
    Guy
    nmwirez's Avatar
    nmwirez Posts: 453, Reputation: 20
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    #2

    Mar 7, 2007, 01:26 PM
    Quote Originally Posted by guyhood
    I am hooking up a 15kw generator with auto transfer switch to a 200 amp service house.
    The transfer switch has two 240 circuits available, along with 5, 15 amp circuits, and 3, 20 amp circuits. I am trying to decide how to use the 240v circuits. 1)Kitchen oven, 2)Laundry dryer, or just not hook up the dryer (high wattage), and use the 240 circuits for more 15 amp circuits - which I need. Replacing the 240 volt breaker with two tandem 15amp breakers (for four circuits) is what I had in mind. The transfer switch is fed by a 70amp breaker from the main service panel during normal power.
    I really appreciate the answers I have received from this site on my past postings.
    Thank you,
    Guy
    Install a separate smaller manual transfer switch for the 240vac to the range-dryer shared largest conductor feeder. Split feeder with the same size conductor needed for each circuit. This means sizing up to 8awg to the dryer from the transfer switch. Nm
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #3

    Mar 7, 2007, 02:56 PM
    If you can find the exact make and model of tandem breaker for the generator panel, sounds like a good idea to make better use of the KW from the genset, since ranges and dryers are power hogs, ranges can be up to 8KW, one element may be 2500 watts, and a dryer is 5KW.

    You can have quite a bit of 120 volt outlets and lights or appliances on 4-15 amp circuits.
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