What is the ampacity of an individual THWN-2 conductor at 30°C?

The ampacity of a THWN-2 conductor is determined by factors such as the conductor's size, insulation type, and the ambient temperature in which it is installed. At 30°C, the ampacity values for various sizes of THWN-2 conductors can be referenced from the National Electrical Code (NEC) tables, which provide standardized data for the performance of wire types under different conditions.

In this case, for smaller sizes of THWN-2 conductors, the ampacity is typically around 30 A at 30°C. This matches the values specified in NEC tables for THWN-2 wires, which indicates their current-carrying capacity under the specified temperature conditions. The resistance and heat generation characteristics of the wire material, along with the insulation properties, influence this maximum rated current.

For larger sizes of conductors or different ambient conditions, the ampacity would increase. However, for the individual THWN-2 conductor specifically at the stated temperature, recognizing 30 A as the ampacity aligns with the standard practices and requirements detailed in electrical codes, which dictate safe operation parameters for wiring systems.