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Thread: Gfci trips

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    boston62's Avatar
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    Gfci trips

    I swapped out my old breaker, with gfci breaker, but when I go to turn on light it trips. My old breaker had just the hot sire going to it, but no white neutral wire. The new gfci had the hot & coiled wire which h I connected to the neutral bar, there is a screw on the gfci for a neutral wire but non on the old one. Here is the gfvi inztalled..Any ideas? Tank you.
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    Mod Squad JohnT's Avatar
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    Re: Gfci trips

    You need to connect the neutral wire that feeds your light to the neutral screw on the breaker.

    A GFCI works by comparing the current in the neutral wire going to the circuit and the hot wire going to the circuit, so they both have to feed through the breaker. The neutral pigtail is the input for the breaker and the screw is the output.
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    Re: Gfci trips

    With a 115 volt GFCI breaker you need to connect the neutral line coming from the light to the neutral connection on the breaker, and then the coiled wire on breaker goes to the neutral bus. This is different from a non-GFCI breaker, where the neutral from the light goes straight to the neutral bus.
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    Re: Gfci trips

    So i have to fish a white wire from the light transformer to the subpanel, can i just join it to the other white wires in the transformer, then fish it over to the subpanel?
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    boston62's Avatar
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    Re: Gfci trips

    The white wire stops at the tranformer...12v
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    Mod Squad JohnT's Avatar
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    Re: Gfci trips

    Quote Originally Posted by boston62 View Post
    So i have to fish a white wire from the light transformer to the subpanel, can i just join it to the other white wires in the transformer, then fish it over to the subpanel?
    No, there is a white wire feeding your circuit in the breaker box already. That wire needs to connect to your GFCI breaker.

    A standard 120V circuit has three wires from the breaker box to the equipment: Black hot, white neutral and bare ground. In your case the equipment is the transformer.
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    Mod Squad jblizzle's Avatar
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    Re: Gfci trips

    There can not just be a single power line running from the breaker to the transformer. There must be a neutral to complete the circuit.

    You make it sound like the transformer neutral might be tied into the neutral for some other circuit. If that is the case, not sure a GFCI breaker is going to work correctly ... unless you run a dedicated neutral wire.
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    Re: Gfci trips

    To put that another way, there must already be three wires, hot neutral and ground, running from the breaker panel to the transformer. You want to connect the breaker panel end of the existing neutral wire to the GFCI breaker, instead of directly to the neutral bus bar.
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    Re: Gfci trips

    I did it, what was confusing the black wire comes in then goes over to the relay load, then back over to subpanel, i found the white wire by looking in the conduit where the light comes over from transformer. Thanks everyone
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    Re: Gfci trips

    Quote Originally Posted by boston62 View Post
    I did it, what was confusing the black wire comes in then goes over to the relay load, then back over to subpanel, i found the white wire by looking in the conduit where the light comes over from transformer. All fixed.. thanks everyone...
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    boston62's Avatar
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    Re: Gfci trips

    Yes it is, and it is appreciated. ..
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