Which statement correctly describes GACAN in this context?

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GACAN is about how many distinct wire gauge sizes are used in the installation. This matters because different gauges have different physical and electrical characteristics, such as diameter, bend radius, fill in conduits, terminations, and compatibility with connectors. Knowing how many gauges appear in the design helps ensure you select appropriate hardware, plan for conduit and enclosure fill, and avoid mechanical or termination issues. The other factors—maximum length per run, shielding requirements, and color coding—are governed by separate considerations: length is tied to signal loss and support constraints, shielding to electromagnetic protection, and color coding to identification, not to how many gauge sizes are used. So the statement that best describes GACAN is the number of different gauges.