What color should the neutral conductor have when different systems are installed in the same raceway?

The neutral conductor should be colored white or natural gray in systems where different conductors are installed in the same raceway. This consistent coloring is essential for ensuring safety and proper identification of conductors, especially in mixed systems. The white or natural gray color denotes the neutral conductor, making it easily distinguishable from other conductors that are typically used for phase (live) connections.

Utilizing white or natural gray for the neutral in all installations provides clarity for electricians and maintenance personnel who need to recognize and work with the different types of conductors present in the raceway without confusion. This standardization aligns with the National Electrical Code (NEC) guidelines and local amendments that help promote safety and uniformity in electrical installations.

In contrast, other colors like red, yellow, green, or black with a stripe are designated for different purposes, such as phase conductors or ground, and using these colors for a neutral would violate coding standards, leading to serious safety hazards and potential electrical faults.