The Square D™ by Schneider Electric brand Heavy Duty Safety Switch is designed to be tough, reliable and provide exceptional performance in the most grueling conditions. All heavy duty safety switches feature a quick-make, quick-break operating mechanism, a dual cover interlock, and a color coded indicator handle. This unit is a ground kit for Series F1-F3/F5-F7/F2-F7, 30 ampere heavy duty safety switches. The grounding kit accepts (2) 14 AWG to 6 AWG copper wires. All heavy duty safety switches are tested per UL98 and NEMA KS1 standards and are UL listed.