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Color-coding on electrical wires is a critical safety feature that identifies the function of each wire within an electrical system. This system of color codes helps electricians, technicians, and anyone working with electrical systems quickly determine the role of a wire, such as whether it is carrying current (hot), providing a return path (neutral), or grounding the electrical system for safety.

For instance, in standard residential wiring in the United States, the color black or red typically represents hot wires, white indicates neutral wires, and green or bare wires are designated as ground. This intuitive system of color coding enhances safety by reducing the risk of accidental contact with hot wires or improper connections. Understanding these colors is vital for anyone involved in electrical installation, maintenance, or repair.

In contrast, identifying the voltage levels in the system, specifying the type of insulation, or determining the age of the wiring is not indicated directly by wire color. While such attributes may be relevant for specific installations, they do not relate to the foundational function of the wires themselves, which is clearly signified through their color.