What defines a "Listed" product under NEC Article 680?

A "Listed" product under NEC Article 680 is defined as equipment that has been tested and approved by an independent laboratory. This designation indicates that the product has undergone specific evaluations for safety, performance, and compliance with the necessary standards established by the National Electrical Code (NEC) and other relevant safety agencies.

The significance of having a product listed is that it assures users and installers that the equipment can be installed safely and is appropriate for the intended application. The testing by an independent laboratory provides a level of assurance about the safety features and reliability of the product, which is especially crucial in environments where water and electricity intersect, such as pools and spas.

In contrast, products available at retail stores may not have gone through the rigorous testing and certification processes required to be deemed "listed." Similarly, while items that meet local building codes are important for compliance, they do not guarantee the same level of standardized safety and performance as "listed" products. Lastly, products manufactured in-house do not automatically qualify as "listed" unless they undergo the proper certification process, regardless of their manufacturing origin. Thus, the process of independent testing and approval is fundamental to understanding what constitutes a "listed" product in accordance with NEC Article 680.