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Old 03-29-2009, 11:04 AM   #1
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Outside gfi Outlet


I am in South Carolina and I am having a problem with an outside GFI outlet. Whenever we get a extreme amount of rain the GFI outlet goes bad, It is not getting wet, but there was a little rust on one end of a black wire running to it. The Gfi is in the midle of the run and connected to anouther gfi in the bathroom on the same level. Do i have to have a gfi outside if it is connected to the one in the bathroom. As soon as the outside one goes bad it pops the one in the bathroom. I replace the gfi outside and it is fine until we get an other extreme storm. I put a good outdoor cover on it and it does not happen often but it is still a problem.
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Old 03-29-2009, 11:31 AM   #2
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Outside gfi Outlet


Bathroom is supposed to be a dedicated circuit
But if it was wired that way you do not need to change it

If you run the outside outlet off the "LOAD" of the bathroom GFCI then you do not need a GFCI outside

If the outside is run off the "FEED" wires then you do need a GFCI outside

Current code requires a Tamper proof & weather resistant outlet outside

I prefer my outside outlets seperate from inside circuits. That way you (or future owner) doesn't have to look around inside for a tripped GFCI

Last edited by Scuba_Dave; 03-29-2009 at 12:17 PM. Reason: sp
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Old 03-29-2009, 12:07 PM   #3
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Outside gfi Outlet


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Originally Posted by jm219412 View Post
and connected to anouther gfi in the bathroom on the same level.
Cascading GFCIs makes for difficult troubleshooting.

To check if moist cable insulation is causing the current leakage,
when the tripping condition shows up [or try to induce it with a sprinkling can]
disconnect the ground wire [treat the lifted ground wire as if it were energized] at the panel
and put an AC milliammeter in series with a 1/16A [or less] fuse between the lifted ground wire and the panel ground.
More than 4mA fails and more than ~100 uA is suspect.
Disconnect all appliances on this line first.
The fuse protects the milliammeter's internal fuse.

If it's not the cable, and it is not somehow the disconnected appliances, then it is almost certainly the GFCIs themselves that are tripping from moisture.

Last edited by Yoyizit; 03-29-2009 at 12:15 PM.
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Old 03-29-2009, 12:12 PM   #4
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Outside gfi Outlet


A good weather proof cover and a liberal amount of silicone may take car of the problem.
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