Why must temperature ratings be considered during installation?

Considering temperature ratings during installation is critical because higher temperatures can significantly reduce the current-carrying capacity of conductors. In electrical systems, conductors are designed to handle specific amounts of electrical current safely, which is often referred to as their ampacity. When the temperature rises, the resistance within the conductor increases, leading to a reduction in the amount of current that can be safely carried without overheating.

If a conductor is installed in an environment where the temperature exceeds its rating, it may not be able to dissipate heat effectively, which can result in overheating and potentially lead to insulation breakdown, short circuits, or even fires. Therefore, selecting the right conductor based on the temperature rating ensures both the performance and safety of electrical installations.