LAMPS | Dimmable: Non-Dimmable ; Operating Temp: -20c (-4f) to a Maximum of +45c (+113f) ; Nsf Approved: Yes - Approved | For Reverse Service (Generator Applications); Grounding Style: Shell and Extra Pole; Designed to Supply Power to Portable or Fixed Electrical Equipment Such as Motor Generator Units, Welders, Pumps, Compressors, Cellular Relay Stations and Similar Apparatu | Use Through Knockout to Connect Box to Conduit Coupling; Use With a Locknut to Connect Two Boxes Side by Side or Back to Back; Use With a Locknut to Connect Fixture Housings in Continuous Runs; Rigid Conduit Threads (Nps)Furbay Electric Supp