Which three temperature ratings are the most common for insulated conductors?

The most common temperature ratings for insulated conductors are 60°C, 75°C, and 90°C. These ratings indicate the maximum temperature that the insulation can safely handle without degrading, which is crucial for ensuring the reliability and safety of electrical installations.

Conductors rated at 60°C are typically used for lower temperature applications and are often found in residential settings. The 75°C rating is more versatile, commonly used in various commercial and industrial applications where a higher heat tolerance is required. The 90°C rating is often used for conductors in environments that experience higher temperatures, providing sufficient margin for heat buildup that can occur during operation.

Understanding these ratings helps professionals select the appropriate conductors for different applications, ensuring compliance with electrical codes and enhancing the overall safety of electrical systems.