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    fw_man's Avatar
    fw_man Posts: 2, Reputation: 1
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    #1

    Nov 15, 2011, 05:18 PM
    Main Panel to Sub Panel wiring
    The feeder cable for a 30A to 40A subpanel is supposed to have 4 conductors? 2 live, 1 neutral, 1 ground. Correct?

    I have a Cutler 200A main panel. What kind of a "feeder breaker" would I use to be able to drive 2 live wires in this cable?
    Thanks very much!
    donf's Avatar
    donf Posts: 5,679, Reputation: 582
    Printers & Electronics Expert
    		  
    #2

    Nov 15, 2011, 05:34 PM
    The description of the conductors in the cable is correct. What you also need to know is the amperage the cable is to carry. If the distance is over 100 ft. then you should also consider the voltage drop. The total end to end voltage drop cannot exceed 5%.

    If you want to carry 30 Amps then you need 10/3 cable.

    If you are going to use 40 amps, then you will need to use a #8/3 cable.
    fw_man's Avatar
    fw_man Posts: 2, Reputation: 1
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    #3

    Nov 15, 2011, 07:50 PM
    I will be going 2 feet at most. So I will use either a 10/3 or an 8/3 cable. What about my second question:
    I have a Cutler 200A main panel. What kind of a "feeder breaker" would I use to be able to drive 2 live wires in this cable?
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #4

    Nov 15, 2011, 09:22 PM
    Quote Originally Posted by fw_man View Post
    I will be going 2 feet at most. So I will use either a 10/3 or an 8/3 cable. What about my second question:
    I have a Cutler 200A main panel. What kind of a "feeder breaker" would I use to be able to drive 2 live wires in this cable?
    Either a 2-pole 30A or a 2-pole 40A, depending on which cable you use.
    Make sure it matches the panel type. Mainly Cutler has CH and BR style breakers.
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