UL承認証明書
Underwriters Laboratories (UL) is one of the oldest safety certification companies. They certify products, facilities, processes or systems against industry standards. In doing so, they have issued more than 20 different UL certifications for a wide range of categories. Do I need UL certification? It is not required by law to have a UL listed certified unit. However, this is a common practice as many large companies will only purchase equipment that passes UL safety testing. Underwriters’ Laboratories, or UL as it is universally known, tests and evaluates components and products that allows a certification mark to be placed by the manufacturer. Most common are the “UL Listed” and “UL Recognized”…