< All Topics Main Fire Detection Systems What Does UL Listed Mean? Print What Does UL Listed Mean? PostedJune 30, 2022 UpdatedJune 30, 2022 Byhrss Underwriters Laboratories, UL, is a company that is approved by the U.S. Occupational Safety and Health Administration, OSHA, to perform safety testing on various products and new technologies over a wide range of industries. Read More Previous What Are the Two Most Common Smoke Detection Systems? Next What is a Public Safety signal booster?