Self-contained unit of jack, junction box and cable clamp. Non-fusible. Polarized Plug-in Jack is designed for applications where moveable trolleys are not required, such as in sewing rooms or for connecting lighting fixtures and small tools. Plug-In Jacks can be inserted at any point in the busway (track). Following insertion, a quarter turn of the Plug-In Jack establishes electrical contact with the bus bars and locks the plug-in jack securely in place. Equipment ground is accomplished through the metallic shell of the busway housing. Lead wires are color coded. One 1/2" Junction Box knock-out complies with OSHA.