When feeder conductors share a common neutral and are installed in a metal raceway, they must be enclosed within the same raceway.

When feeder conductors share a common neutral and are installed in a metal raceway, they must be enclosed within the same raceway.

• A. Insulated for 600 volts
• B. The same color
• C. Enclosed within the same raceway
• D. Shielded

Answer: (C)

When a feeder uses a shared neutral, the currents in the two hot conductors depend on each other, with the neutral carrying the difference. If those conductors are not kept together in the same enclosure, it becomes possible for the neutral or return currents to take unwanted paths and for one circuit to remain energized when the other is switched off. Enclosing all the feeders and the shared neutral within the same metal raceway ensures they’re treated as a single set of current-carrying conductors that can be simultaneously de-energized by the disconnect, and it prevents the raceway from becoming an unintended current path. This arrangement minimizes shock risk and maintains proper protection for the shared-neutral setup. The other options don’t address this safety and disconnection requirement.

When a feeder uses a shared neutral, the currents in the two hot conductors depend on each other, with the neutral carrying the difference. If those conductors are not kept together in the same enclosure, it becomes possible for the neutral or return currents to take unwanted paths and for one circuit to remain energized when the other is switched off. Enclosing all the feeders and the shared neutral within the same metal raceway ensures they’re treated as a single set of current-carrying conductors that can be simultaneously de-energized by the disconnect, and it prevents the raceway from becoming an unintended current path. This arrangement minimizes shock risk and maintains proper protection for the shared-neutral setup. The other options don’t address this safety and disconnection requirement.