I love these plastic enclosures for my electrical projects, but they almost never come with the backings needed to mount equipment inside the boxes. In the past I would buy plastic inserts designed for these boxes, but this time around I decided to use some scrap plywood to build my own backing. Going out in to my garage I locate some cut offs of old plywood. Always keep your cut offs of wood, never know when you can use them again.
The plastic inserts probably will not last as long as wood, and with hot and cold cycles I think the plastics inside will become brittle. So this may just end up being a better design than going with what you can buy. And only costing a fraction of the money, these inserts can cost anywhere from $20 to $60 depending on size. This cut of wood cost me a few cents.
We start by looking at the holes used to attach to plastic backings they sell, I wont be needing those.
Cutting the wood to fit nearly perfectly took a few tries, but once I got the gaps worked out I plugged in my glue gun and starting laying down hot snot.
The hot glue would dry very fast, and made a nice seal against the wall of the enclosure.
As it dries it may expand and form a little and fill any cracks I missed.
I really like this glue gun, its a heavy duty model and can throw out alot of hot snot... aka hot glue.
I start at the top and work my way down, so I do not mess up the glue beads already put down.
There it is, just needs to dry for an hour or so. And ready to mount equipment. You can screw in hardware anywhere since its wood, unlike the grid patterns you get with the premade backings.
Be mindful that wood is flammable, so building a proper system is needed otherwise it could catch on fire. But honestly so can this plastic, so always make sure your wiring is correct, you are using devices at their rated power or less, the right gauges wire is used and your connections are tight.