FS, FD, and larger cast or sheet metal boxes are classified as which of the following?

FS, FD, and larger cast or sheet metal boxes are classified as "not conduit bodies" due to their specific design and purpose in electrical installations. Conduit bodies are typically used as junction points to provide access to conductors or to change the direction of raceways, but they do not serve the same function as junction boxes or larger enclosures.

In contrast, FS (floor box) and FD (fabricated box) serve as protective and accessible terminals for electrical connections and equipment, which aligns more with the functions of boxes that accommodate wiring and electrical devices rather than those designated for conduit functions. Therefore, understanding the role of these boxes in an installation helps clarify why they are categorized as not conduit bodies, emphasizing their unique attributes and intended use in electrical systems.