I installed a switched GFCI receptacle for a pool on a piece of 7/8 in
x 10 ft strut driven 6 feet in the ground with the other 4 ft to mount
the switch and receptacle boxes. I used to single gang boxes and a
switch that looks like this
The boxes come with 1/2 inch openings in each end of the box and one
in the back. It also comes with plugs.
I used 1/4 x 1 1/2 in bolts and 1/4 in x 1 1/4 washers to mount the
boxes to the strut through the 1/2 knock out in the back of the box. I
"ass"umed the washer inside, covering the hole, would make a seal
tight enough to keep water out. I was wrong. After just a year the
It turned out that the top box with the switch was full of water to
the level of the bottom lip of the box. It also was full of mildew.
Are the plugs that come with the box supposed to be water proof
without using any sealer?
Would it be a good idea to drill weep holes in the bottom of the boxes
to let any water out?
Does a washer in the back of the box make a water tight seal?
I plan on redoing the boxes and sealing the openings at the top and
back, but is sure didn't seem necessary at the time.