GFI- fault when it rains

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  #1  
Old 08-24-06, 03:52 PM
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GFI- fault when it rains

I have a GFI circuit that has an exterior pond on it. This pond circuit has a pump and light. Ive now seen that when it rains hard the GFI trips. When it dries out, the GFI will reset.

I see no visible water entry into anything.

Can anyone give me an idea of where to begin to debug this?

Thanks

Gary
 
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  #2  
Old 08-24-06, 04:37 PM
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Does it trip even with the pump and light unplugged?

If so, start with the receptacle. Water is getting somewhere.
 
  #3  
Old 08-24-06, 07:54 PM
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Location: Milwaukee WI
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Originally Posted by Garyk
I have a GFI circuit that has an exterior pond on it. This pond circuit has a pump and light. Ive now seen that when it rains hard the GFI trips. When it dries out, the GFI will reset.

I see no visible water entry into anything.

Can anyone give me an idea of where to begin to debug this?

Thanks

Gary
Is the equipment plugged directly into the tripped GFCI receptacle, or is the equipment on a receptacle at some distance on the LOAD (pass-thru) side of the GFCI receptacle or on a GFCI breaker? Is the circuit in PVC conduit, rigid, or via UF cable? If the tripped GFCI is upstream, there could be an insulation fault.

Are you using a weatherproof-while-in-use cover? Is the cover oriented properly and latched? In a driving rain enough water may get in to cause a ground fault.
 
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