May all feeder or branch-circuit conductors be attached to a feeder and/or branch-circuit mast?

The correct response reflects the National Electrical Code (NEC) guidelines regarding the installation of feeder and branch-circuit conductors. The NEC specifies that feeder and branch-circuit conductors have distinct roles and requirements within electrical systems.

Feeder conductors are designed to carry power from a service entrance to a distribution point, while branch-circuit conductors distribute power from that point to the final load devices. Because of their different functions, there are specific regulations that determine how and where these conductors can be run and attached.

The NEC restricts the attachment of all feeder and branch-circuit conductors to a single mast, as this may lead to complications in serviceability, maintenance, and compliance with safety standards. By separating these conductors, it reduces the risks associated with overheating and simplifies troubleshooting.

Thus, stating that they cannot all be attached together to a mast is supported by the safety principles outlined in the NEC, ensuring that installations remain safe and efficient.