Fdc Deep Depth 1-Gang Cast Device Box | Control Circuits Lighting General Loads | Control Transformers Solenoids Inductive Loads Lighting Heaters General-Purpose Loads | Designed to Compensate for Length Changes Due to Temperature Variations in Exposed Conduit Runs | Electronic Circuits | For Use With Threaded Metal Conduit and Imc | Installed in a Conduit Run, Compemsates for Temperature Changes