What aspects does the Unisagwatch calibration take into account?

The correct answer highlights that the Unisagwatch calibration considers various important factors, including composition, size, weight, and span length. When calibrating such a system, it is crucial to account for these parameters because they directly influence the performance and accuracy of sag measurements in overhead lines.

Composition plays a significant role because different materials have distinct electrical and mechanical properties, affecting sag behavior. Size and weight are equally essential as they determine how much sag occurs under load, influencing the tension in the line and the potential for dynamic effects such as wind or ice loading. Finally, span length is vital since it impacts how sag distributes across the length of the cable, which can vary significantly based on the overall construction and environmental impacts.

These integrated factors ensure that the calibration process provides accurate readings necessary for maintaining optimal utility performance and safety standards in overhead electrical systems.