What is the primary requirement for feeder conductors installed in a metal raceway that share a common neutral conductor?

In electrical installations, when feeder conductors share a common neutral conductor, it's important for the conductors to be enclosed within the same raceway. This requirement ensures that the return current through the neutral is balanced and that there are no issues with potential differences or electromagnetic interference. Additionally, keeping the conductors together within a single raceway helps maintain the integrity of the circuit and provides a degree of protection against physical damage.

This standard setup helps to prevent undesirable voltage imbalances that could arise if the conductors were separated, as well as insulating the circuits from external factors that could introduce noise or other problems. Proper installation according to these guidelines promotes safety and enhances the overall reliability of the electrical system.