Fdc Deep Depth 1-Gang Cast Device Box | Circuit Protection | Control Circuits Lighting Ballasts Meter Circuits Electronic Circuits | Designed to Compensate for Length Changes Due to Temperature Variations in Exposed Conduit Runs | Electrical Distribution | Electronic Circuits | For Adapting Non-Metallic Conduits to Threaded Fittings, Metallic Systems | For Use With Threaded Metal Conduit and Imc | Installed in a Conduit Run, Compemsates for Temperature Changes