Low voltage box question
The current code requires a 20 minute membrane separation between the house and the garage, and further requires that all structural elements (walls, posts, etc) supporting the surrounding structure. Anytime an electric box is put in a fire separation, it needs to be an appropriate box for the application. Since they don't make 20 minute boxes, the electric box will have to be a one hour box (which is a pretty standard box, with a few exceptions). Most plastic boxes that you find at home improvement centers are 1 hour rated. Mudrings or those plastic low-voltage boxes without backs on them carry no fire resistance rating, and are therfore not to be used in garages. Low voltage and home automation installers make this mistake on a regular basis! Installation of electric panels, alarm panels, or other electric boxes over 16 square inches (opening dimension) in the garage sheetrock is a no-no due to the added potential for passage of heat and fire in the event of a garage fire.