Alc Series Ball Hanger | Control Circuits Lighting General Loads | Control Circuits Lighting Ballasts Meter Circuits Electronic Circuits | Designed to Compensate for Length Changes Due to Temperature Variations in Exposed Conduit Runs | For Code Conductor | For the Protection of Multi-Meters | For Use in Metal Framing Applications | For Use With Threaded Rigid Metal Conduit and ImcFurbay Electric Supp