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Old 01-06-2016, 09:06 PM   #1
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Waterproofing electrical box


I have a light post in my back yard that is run off of a GFCI outlet at the base of the pole. The line side of the outlet feeds a timer that is surface mounted in a "waterproof" Bell box (gray metal with foam gasket and in-use cover) and then on to a pair of CFL fixtures. We have had heavy rains the last couple days; the fixture was fine yesterday but today tripped the GFCI and immediately tripped it again when I went to reset it.

I narrowed the problem down to water getting into the timer box itself; despite their "waterproof" nature, those foam gaskets do a terrible job of sealing out rain. I took it apart, dried the water out, and everything is working as expected now. My question is how to prevent this from happening again - is just caulking around the half-assed gasket an acceptable solution?
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Old 01-07-2016, 03:55 AM   #2
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Ditto !
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Old 01-07-2016, 07:53 AM   #3
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Quote:
Originally Posted by Syberia View Post
I have a light post in my back yard that is run off of a GFCI outlet at the base of the pole. The line side of the outlet feeds a timer that is surface mounted in a "waterproof" Bell box (gray metal with foam gasket and in-use cover) and then on to a pair of CFL fixtures. We have had heavy rains the last couple days; the fixture was fine yesterday but today tripped the GFCI and immediately tripped it again when I went to reset it.

I narrowed the problem down to water getting into the timer box itself; despite their "waterproof" nature, those foam gaskets do a terrible job of sealing out rain. I took it apart, dried the water out, and everything is working as expected now. My question is how to prevent this from happening again - is just caulking around the half-assed gasket an acceptable solution?
I use GE Siicone 2 Gutter and Flashing caulk.
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Old 01-07-2016, 10:50 AM   #4
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Also, make sure there are no "drywall ears" on the timer. Those prevent a good seal on the rubber gasket.
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Old 01-07-2016, 11:47 AM   #5
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Have you caulked around both sides and top of the box where it meets the pole ? What about caulking over the screw in plugs, particularly on the top of the box.
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Old 01-07-2016, 03:03 PM   #6
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The first thing I do when installing a so called weatherproof box is to drill a 3/16th hole in the bottom. This will prevent the build up of condensation and if you do get water in, it gives it a way out.
PS, Weather proof is not water proof.

Tim.
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Old 01-07-2016, 03:17 PM   #7
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Caulked the hell out of everything I could see earlier today; the drain hole sounds like a good idea so I'll drill one later
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