Commercial Grade - AC Quiet Switches Back & Side Wire. Tapered lead-in slots on back wiring holes assist in gathering stranded wires for faster, more secure connections. Side wire and back wire terminals accept up to #10 solid or stranded wire. Ground screw terminal standard. 120/277V/AC rating ideal for fluorescent lighting fixtures typical in commercial applications. Tri-combination slot/Phillips Robertson head mounting and terminal screws ease installation with power screwdrivers.