I am a huge fan of Mike Holt's show. I know that he's a bit particular, so I have to wonder whether what is done on his show is a formal CEC requirement or just his personal preference.
I've never seen his electricians using plastic boxes; they are always metal ones for receptacles and switches. We don't see metal-only much in these parts in new construction (except in the Chicago area).
While we are on the subject, I never see his crews using nails for anything other than trim. They always seem to be using impact screw guns, even for basic stud wall framing. Is that another Canadian requirement or just something that his show's major sponsor (Dewalt) throws in?
Sorry for the simple questions. I have to stay up until 3:00 for a software upgrade that we are doing, I just got done watching a re-run of his show and figured that I would ask these questions while they are fresh in my mind.
"But the guy at Home Depot said it would work."