50-Foot 12/3 STW Light String - 5 Outlets - Portable Lighting for Workshops and Job Sites Heavy duty 12/3 STW 600-volt power cord is used on each temporary light string. Molded-on, weatherproof lamp holders with heavy duty vinyl coated metal lamp guards are spaced in 10 ft. intervals for even distribution of light. This cord can be suspended by messenger wire or hung from any nail or fastener. UL listed and cUL approved for Canada. Meets OSHA specifications for outdoor use.