Grounding Terminal Screw Standard. Combination Switch With Additional Switch Has 120/277 Volt Rating, Ideal For Fluorescent Lighting Fixtures Typical In Commercial Applications. 0.050" Thick Steel Mounting Strap Zinc-Plated For Corrosion Resistance. Break-Off Provision For Wiring Both Devices On Same Circuit Or On Separate Circuits. Terminal Screws Backed Out And Ready For Wiring. Side Wire Terminals Accept Up To #10 Solid Or Stranded Wire. Combination Slot/Phillips Head Mounting And Terminal Screws. Switches Meet All UL 20 Requirements. UL Listed.