The NEC^® requires 15 and 20-ampere, 125 volt, single phase receptacles supplying power for garage door openers located in attached or detached garages associated with dwelling units to have ground-fault circuit-interrupter (GFCI) protection for personnel.

As well, the device providing the GFCI protection must be readily accessible which usually results in a standard duplex receptacle installed on the ceiling, and supplied from the load side of a GFCI circuit breaker or from the load side of a GFCI type receptacle located elsewhere in the garage.

In North Dakota, the rules are a bit different, see below:

24.1-06-02-10 note 7. Fifteen and twenty ampere receptacles supplying power for garage door openers located in attached or detached garages associated with dwelling units must be ground-fault protected or a single receptacle installed. The single receptacle must be labeled for intended use and that it is non-GFCI protected.

Refer to the Laws, Rules and Wiring Standards of North Dakota for additional information.