Definition

UL 796 is the primary UL safety standard for rigid and flexible printed wiring boards. It covers materials, construction, and performance testing including flammability, thermal endurance, electrical insulation, and mechanical strength. The standard evaluates PCBs for safe operation under normal and abnormal conditions. UL recognition (the UL marking on boards) is required for many end products sold in North America. Your fabricator's UL file number (E-number) identifies their certified constructions.