What is the color code for a neutral wire in 120/240V AC electrical systems in the U.S.?

In 120/240V AC electrical systems in the U.S., the neutral wire is designated by the color white. This standard color coding is critical for safety and proper identification of wires, as it helps prevent wiring errors that could lead to dangerous electrical faults.

The function of the neutral wire is to complete the electrical circuit by providing a return path for current flowing from the load back to the source. Since the neutral wire typically carries the return current, it must be easily identifiable, which is why adherence to color coding is enforced in electrical installations.

Using white for neutral ensures that electricians and anyone working with electrical systems can quickly identify this critical component of the circuit. This practice adheres to the National Electrical Code (NEC), which mandates proper wiring practices and color coding across residential and commercial installations to promote safety and consistency.