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    Bubba14's Avatar
    Bubba14 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Jun 26, 2012, 02:47 AM
    Breaker installation in a square d sub panel box
    I installed a 30 amp breaker in a square D box to run my RV. It looks like the neutral bar and ground bar are the same. Other breakers that are in place work fine. When I turn the 30 amp breaker on the lights go bright and then the 30 amp trips. Any suggestionis
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #2

    Jun 26, 2012, 04:41 AM
    What kind of wire did you run?
    What kind of breaker is it? Single pole or double?

    I have the suspicion that you installed a 240v circuit to a 120V travel trailer receptacle.

    Can you post a pic of the panel?
    Bubba14's Avatar
    Bubba14 Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Jun 26, 2012, 09:56 AM
    It is a single pole breaker and it has 120/240 on the front of it. The wire I am using is 12/2
    donf's Avatar
    donf Posts: 5,679, Reputation: 582
    Printers & Electronics Expert
    		  
    #4

    Jun 26, 2012, 04:57 PM
    One problem is the cable. A 240Vac, 30 amp circuit requires # 10/3 AWG conductors. #12 AWG conductors are only listed for 20 amp.

    Next, how far from the panelboard is this RV?

    In order to feed 240 Vac from the panelboard, you must use a dual 30 amp breaker. A single breaker can only supply 120 Vac.
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