He explained that plastic junction boxes are more common in residential settings. Because plastic is a non-conductive material, models made of the material cannot be grounded.

A suitably-sized plastic junction box is a good starting point, but it takes more than that to make a functional enclosure.

Your Plastic Box Won't Distort, Crack, Or Melt Generally speaking, the notion that plastic electrical boxes aren't up to the job is belied by the facts — and by the National Electrical Code.

Even if you can't get boxes for free, cardboard boxes only cost about $2 each, while renting equivalently sized plastic crates may cost $3 to $6 per box. The one exception to that general price ...