16 C.F.R. § 1211.2
Definition
As used in this part 1211: Residential garage door operator means a vehicular door operator which:
(a) Serves a residential building of one to four single family units;
(b) Is rated 600 volts or less; and
(c) Is intended to be employed in ordinary locations in accordance with NFPA 70 (incorporated by reference, see § 1211.32).