What does it mean when equipment is referred to as "listed"?

When equipment is described as "listed," it indicates that the item has successfully passed specific safety or performance standards set by a recognized authority or organization, such as Underwriters Laboratories (UL) or the Nationally Recognized Testing Laboratory (NRTL). This certification provides assurance to consumers, inspectors, and professionals that the equipment meets rigorous safety criteria and is safe for use in its intended application.

Being "listed" means that the equipment has undergone thorough testing and evaluation to ensure it performs reliably and safely under specified conditions. This designation is crucial in the electrical field, as it helps to mitigate risks associated with electrical failures, fires, and other hazards that may arise from using inferior or untested products. Choosing listed equipment is integral to maintaining safety in installations and ensuring compliance with building codes and regulations.

The other options do not accurately reflect the meaning of "listed." For example, the suggestion that it comprises a random selection of potentially faulty products lacks the assurance of safety that "listing" provides. Similarly, while items may be regularly tested, the focus of being "listed" specifically relates to passing established standards rather than merely undergoing tests. Lastly, the idea that "listed" refers to items no longer in production does not correspond with the definition of listed products