Section 111.79-15 - Receptacles for refrigerated containersReceptacles 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.