The safety ground conductor is usually colored:

The safety ground conductor is usually colored green. The use of green for ground wires is standardized in many electrical codes, including the National Electrical Code (NEC) in the United States. This color designation helps ensure that anyone working with electrical systems can easily identify the ground conductor, which is critical for safety. The ground conductor is designed to carry fault current safely to the earth, preventing electric shock in case of insulation failure or other issues.

Color coding is important in electrical installations to ensure clear differentiation between the various conductors—such as those for phases, neutrals, and grounds—allowing for safe maintenance and installation. The choice of green as the color for ground conductors is both practical and effective in promoting safety standards across the industry.