What is the purpose of color coding in control wiring?

• A. Identify manufacturer
• B. Indicate temperature rating
• C. Identify function or conductor type
• D. Indicate voltage level

Answer: (C)

Color coding in control wiring serves as a quick visual way to identify what each conductor is used for. By assigning specific colors to different functions—such as power supply, return/neutral, ground, or a particular control signal— technicians can immediately recognize the role of a wire, trace circuits accurately, and wire panels correctly. This reduces the chance of wiring errors, speeds installation and troubleshooting, and aligns work with standard practices. It’s not about who manufactured the wire or about a temperature rating; those details come from labels, specifications, and documentation. Likewise, voltage information is usually determined from schematics or markings, not the color alone.