What is the purpose of Table 310.16?

Table 310.16 is designed to provide ampacity ratings for conductors based on various insulation types and environmental conditions. Ampacity refers to the maximum amount of electric current a conductor or device can carry before sustaining immediate or progressive deterioration. This table takes into account different insulation materials—such as THHN, TW, and others—which affect how well a conductor can handle electrical current under varying temperature ratings.

In addition to insulation type, Table 310.16 also factors in temperature ratings and installation conditions, making it a crucial reference for electrical professionals when selecting conductors for different applications to ensure safety and compliance with the National Electrical Code (NEC). Understanding the ampacity ratings is essential for preventing overheating and ensuring the reliability of electrical systems.