Interlocked Receptacle Switches are furnished with a factory-installed 3 Phase 4 Wire Appleton Powertite
®, Crouse-Hinds Style 2 Arktite
®, or Hubbellock
® receptacle. The fourth wire is connected to the switch equipment grounding terminal and is not a neutral termination. Interlocking linkage between the receptacle and switch mechanism prevents insertion or removal of the plug while the switch is in the “ON’’ position or insertion of any plug other than specified. Grounding lugs are included.