What does the term "approved" refer to in the context of the NEC?

In the context of the National Electrical Code (NEC), the term "approved" specifically refers to something that is acceptable to the authority having jurisdiction (AHJ). This means that any materials, methods, or installations must be vetted and sanctioned by the local regulatory body responsible for enforcing electrical safety standards. The AHJ is often a representative from the local government or a designated inspector who examines whether the electrical work complies with local codes, standards, and regulations as well as the NEC.

This understanding emphasizes the role of local authorities in overseeing electrical installations, ensuring they meet safety criteria and other legal requirements. The determination of what is "approved" aligns with the goal of maintaining safety and reliability within electrical systems, underscoring that compliance goes beyond the NEC to local interpretations and adaptations of the code.