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Harness color standard refers to a set of color coding specifications set to facilitate the identification and differentiation of different wires in the harness. Uniform color standards allow accurate identification of the function and connection of the wires during installation, maintenance, and troubleshooting. Here are some common wiring harness color standards: High Temperature Electronic Wire Color Standard (UL 3239): Red: Power Positive Black: Power Negative White: Neutral Blue: Control Signal Yellow/Green Double Color: Ground Wire (Ground Wire) Low Voltage Electronic Wire Color Standard (UL 1007): red: positive power supply black: negative power supply white: neutral wire blue: control signal green: ground wire (ground wire) Automobile harness color standard: red: positive power supply black: negative power supply white or gray: neutral wire blue: control signal green or green/yellow: ground wire (ground wire) Communication harness color standard: orange: optical fiber signal green: Ethernet Signal Blue: Telephone Signal Yellow: Video Signal Purple: Audio Signal It should be noted that color standards may vary by industry, region, and specific application. Therefore, in specific projects or applications, there may be specific color coding requirements. In addition, some color standards may use other designations than color, such as numbers or labels, to further distinguish wire functions. Ensuring the consistency and accuracy of the harness color standard is critical to proper installation, maintenance, and troubleshooting. A standardized color-coding system improves work efficiency, reduces the risk of incorrect connections, and provides clear harness information to meet electrical engineering requirements. When using the harness, the individual wires should be correctly identified and connected according to specific standards and specifications to ensure the safety and reliability of the electrical system.
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