Which article discusses materials used for fixtures in wiring?

The correct choice highlights Article 394, which specifically addresses the materials used for fixtures in wiring. This article outlines the requirements for the construction and installation of various wiring methods that incorporate fixtures. It provides guidelines on the safety, durability, and appropriate use of materials to ensure that they comply with the National Electrical Code's standards.

Understanding the sections of NEC is crucial because each article serves a particular function. For instance, other articles may cover general requirements, conductors, or equipment, but Article 394 distinctly focuses on the requirements surrounding the materials used in fixtures, which is vital for guaranteeing safe electrical installations.