How are terminals on receptacles for grounded neutral conductors to be identified?

The identification of terminals on receptacles for grounded neutral conductors is specified by electrical codes to ensure proper electrical safety and operation. The correct answer focuses on the requirement that a terminal is identified by being metal or coated in a substantially white color. This standardization is crucial because it allows for a universal recognition of grounded neutral conductors. The white or metallic color indicates the neutral connection, which helps prevent wiring errors during installation and maintenance.

The other options suggest identification methods that are not exclusively recognized or universally applicable. The use of color alone, without the specification of it being a specific hue like substantially white, may not clearly indicate the function of the terminal. Identifying with the letter "N" can also lead to confusion or misinterpretation, especially in complex wiring scenarios. Therefore, the standard that emphasizes the terminal being metallic or coated in a substantially white color is the most accurate and codified approach to classification, ensuring clarity and safety in electrical installations.