What indicates that a wire may be carrying higher-than-normal current?

A wire carrying higher-than-normal current typically exhibits an increase in temperature due to the electrical resistance encountered as the current flows through it. This overheating can lead to a variety of issues, including insulation breakdown, potential short circuits, or even fire hazards. Therefore, if a wire is getting too hot, it serves as a clear indicator that the current level may exceed safe operating limits. Monitoring temperature is critical in electrical systems to ensure safe and efficient operation.

Other signs, like the wire emitting a burning smell or swelling, often result from excessive heat but may be less immediate indicators compared to temperature. A wire being cool to the touch, on the other hand, would suggest that it is operating within a safe range, which is the opposite of what’s happening in a situation where there is higher-than-normal current.