Receptacles for refrigerated containers must meet one of the following:
(a) Each receptacle for refrigerated containers must have a switch interlocked in such a way that the receptacle's contacts are deenergized before the making or breaking of the connection between the plug and receptacle contacts.
(b) Each group of receptacles for refrigerated containers must have:
(1) A switch near the receptacles that disconnects all power to those receptacles; and
(2) A sign stating that the switch should be opened before cables are disconnected from the receptacles or refrigerated containers.
(c) Each receptacle for refrigerated containers must be designed for circuit breaking service.