What ampacity does one 8 AWG THWN-2 copper conductor have in free air at 30 degrees C?

The ampacity of a conductor refers to the maximum amount of electric current it can safely carry without overheating. For an 8 AWG (American Wire Gauge) THWN-2 copper conductor in free air at a temperature of 30 degrees Celsius, the National Electrical Code (NEC) specifies an ampacity of 80 amperes.

This value is derived from the NEC tables, which outline the allowable ampacities of various wire sizes based on different installation conditions. In free air, conductors can dissipate heat more effectively, allowing for a higher ampacity compared to those installed in conduit or other limited spaces.

When considering the type of insulation and the environmental conditions, THWN-2 is rated for wet and dry locations, contributing to its reliability in different scenarios. The 80 A ampacity is important for ensuring safety and efficiency in electrical installations, as exceeding this limit could lead to overheating and potential failure of the conductor.

Therefore, for an 8 AWG THWN-2 copper conductor in free air at 30 degrees Celsius, the correct ampacity of 80 A signifies a safe and efficient carrying capacity for electrical current in these specific conditions.