What does “derating” conductors refer to?

Derating conductors refers to the practice of reducing the ampacity, or current-carrying capacity, of a conductor due to environmental conditions, such as temperature, the number of conductors bundled together, or other factors that could negatively impact the conductor's ability to safely carry current. This is important in ensuring that conductors do not overheat or degrade, which can lead to failures or safety hazards.

For instance, when conductors are installed in an area with high ambient temperatures or are bundled with other conductors, they may require derating to prevent overheating. This helps to maintain safe operating conditions in electrical systems and ensures compliance with electrical codes and standards. By recognizing and applying the need for derating, electricians can effectively manage the risk associated with electrical installations.