Can conduit bushings made entirely of insulating material be used to secure a raceway to a panel board?

Conduit bushings made entirely of insulating material cannot be used to secure a raceway to a panel board because they do not provide the mechanical strength and grounding continuity that is typically required in such installations. In electrical systems, it is essential for the raceway to maintain both physical stability and electrical connectivity as part of the overall safety and functionality of the system.

Conduit bushings serve not only as a protective means against sharp edges where conduits enter enclosures, but they also need to ensure proper grounding. Insulating bushings do not fulfill these requirements since they do not provide the necessary grounding path. Furthermore, electrical codes specify that fittings and bushings must be able to meet certain standards for maintaining integrity in the installation, particularly in environments where electrical faults are a possibility.

In contrast, methods of securing raceways that include metal components or are specifically designed for grounding are acceptable and align with safety regulations. Hence, the correct answer highlights the requirement for securing raceways with appropriate materials that ensure both performance and compliance with codes.