What are the required color codes for conductor sizes 10 AWG and smaller in a 600-volt branch circuit?

The appropriate color codes for conductors in a 600-volt branch circuit are based on the American National Standards Institute (ANSI) and the National Electrical Code (NEC). For conductor sizes up to 10 AWG, the standard color codes designate black for the hot conductor, red for the secondary hot conductor, and blue for an additional hot conductor or for use in three-phase systems.

This specific combination of black, red, and blue is essential for ensuring proper identification of each conductor, which is crucial for safety and effective circuit functioning. The standardized colors also help to prevent confusion in electrical installations and repairs, ensuring that anyone working with or around the system can easily identify what each conductor's purpose is.

Though there are other color codes used in different contexts, such as for grounding (green) or neutral (white), the specific answer stands because it adheres to the standards set forth for branch circuits utilizing conductors of this size in a residential or commercial setting.