What type of boxes are used where conduits require the use of locknuts or bushings?

Metal boxes are the correct choice for installations where conduits require the use of locknuts or bushings. These boxes provide several advantages that are aligned with the requirements of conduit systems.

One of the primary reasons metal boxes are used in conjunction with locknuts or bushings is due to their robust construction, which offers durability and strength in various environmental conditions. Metal boxes are designed to securely accommodate the fittings and connections of conduit systems, allowing for effective grounding and potential for electrical bonding, which is crucial for safety in electrical installations.

Moreover, metal boxes also possess the necessary threaded entries that allow secure attachment of conduits using locknuts. This ensures that the conduits are firmly anchored and less likely to experience movement, which could otherwise lead to loosening of connections or damage over time.

In comparison, while plastic boxes may be used in some applications, they typically do not provide the same level of strength, grounding capabilities, or compatibility with locknuts and bushings. Wood boxes are not standard for electrical installations due to fire risk and lack of proper grounding. Nonmetallic boxes, while versatile, are also not suitable for use with locknuts or bushings, as they do not provide the necessary features needed for secure conduit connections.

Thus, metal boxes