Wall Box Options

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ATX LED switches are designed to use the standard US multi gang wall switch box there are various options, and reasons to not use some of these options

Backless Orange boxes https://www.homedepot.com/p/Carlon-1-Gang-Low-Voltage-Bracket-SC100A/100157326	problem with these, is that the wires are not firmly held in place, and spray foam will push the wires everywehre, and will fill the box - so we do not suggest that they also cost more
Carlon multigang box https://www.homedepot.com/p/Carlon-PVC-1-Gang-20-cu-in-New-Work-Electrical-Outlet-Box-B120A-UPC/205319652	These are recommended
Mixed 120vac / 51vdc boxes https://www.homedepot.com/p/Carlon-2-Gang-Blue-Non-Metallic-Dual-Voltage-Box-Bracket-SC200DVR/100146034	In houses with 120vac fans, these split boxes can be used. The issue with backless remains a concern
Divider https://www.homedepot.com/p/Carlon-Low-Voltage-PVC-Electrical-Box-Divider-Plate-SCDIVR/202077335	Because of the backless issue, these dividers are recommended
Metal boxes https://www.homedepot.com/p/Steel-City-4-11-16-in-2-1-8-in-Deep-42-cu-in-New-Work-Metal-Square-Electrical-Box-Case-of-20-721711234EW-20R/202596191	while metal boxes can be used, we strongly recommend to not use them unless this is a commercial job - the sharp edges damage the wires and the hardware to protect our wires is not well suited for awg 18