For many electricians, it is common practice to look for some form of UL marking on a piece of equipment before installing it. If they see one, they assume everything is okay and proceed with their work. But do you really understand the differences in the variety of UL markings that are out there? Knowing these differences is critical in your work.
From the inception of UL’s Recognized Component program, the use of “Recognized” products has been restricted. Recognized componen