Who performs product testing, evaluation, and listing according to the NEC?

The process of product testing, evaluation, and listing according to the NEC is primarily performed by qualified electrical testing laboratories. These laboratories are recognized for their expertise in assessing the safety and compliance of electrical products with relevant codes and standards, including the NEC. They conduct rigorous testing to ensure that products meet specific performance and safety criteria before they are listed for use in electrical installations.

Qualified testing laboratories provide an impartial assessment, which is crucial for maintaining the integrity of electrical safety standards. Their role is essential because they help to ensure that products are appropriate for the intended applications and that they comply with established safety regulations. This rigorous evaluation process helps prevent hazards associated with electrical systems and ensures that specified installations are safe for public use.

Local authorities, while they may enforce code compliance and safety inspections, do not typically perform the extensive testing required for product listings. Manufacturers might have their own internal testing processes, but they do not provide independent verification that products meet NEC standards. Independent auditors, on the other hand, primarily assess compliance after products are already on the market rather than conducting the primary testing and listing. Therefore, qualified electrical testing laboratories are the key players in this critical aspect of electrical safety.