According to the requirements of 440.63, an attachment plug and receptacle is permitted to serve as the disconnecting means for a single-phase room air conditioner rated 250V or less if (1) the manual controls on the room air conditioner are readily accessible and located within 1.8 m (6 ft) of the floor or (2) an approved manually operable switch is installed in a readily accessible location within sight from the room air conditioner.