111.79-15—Receptacles for refrigerated containers.
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.
(2)
A sign stating that the switch should be opened before cables are disconnected from the receptacles or refrigerated containers.