When is a product or service considered listed?

A product or service is considered listed when it is included on a list published by an organization that is acceptable to the Authority Having Jurisdiction (AHJ). This means that the product or service has undergone rigorous testing and evaluation by a recognized testing laboratory or certification organization to ensure it meets specific safety and performance standards.

This listing is crucial because it provides assurance to consumers, manufacturers, and inspectors that the item has been assessed and conforms to the applicable codes and regulations. The presence of a listing can also facilitate the approval process for installations and usage, as AHJs often rely on these lists to determine compliance with relevant standards and safety requirements.

Although factors such as certification by the manufacturer, low-cost standards, or peer recommendations are relevant in contexts like quality assurance or competitive analysis, they do not fulfill the formal criteria required for a product or service to be officially considered "listed." These criteria emphasize the importance of third-party validation and the trustworthiness of recognized standards in the industry.