Moisture-proof impregnated insulation. Built-in cutout prevents thermal overload. Leads are detachable for easy servicing, handling, and storage. Each unit is individually tested and operates on 20-amp AC single-phase circuit with approx. 5-1/2 ft. ground cable, 8-ft. electrode cable. Open circuit voltage: 48 volts. Convection-cooled transformer. Comes with hand-held face shield, electrode holder and work clamps with cables, wire brush, chipping hammer and operating instructions. Weighs approx. 29 lbs.