What is the ampacity of an 8 AWG THHN conductor when installed with 23 other conductors in a metal wire way at an ambient temperature of 30°C?

To determine the ampacity of an 8 AWG THHN conductor installed in specific conditions, it's important to recognize the definitions and factors that influence ampacity, such as conductor size, insulation type, temperature, and the number of conductors in a raceway or wire way.

An 8 AWG THHN conductor has a standard ampacity that can vary based on installation conditions. Under normal, single-conductor conditions at an ambient temperature of 30°C, the ampacity of an 8 AWG copper conductor is typically around 55 amperes. However, when multiple conductors—like 23 others—are installed together, derating factors must be applied due to the increase in heat generated by the additional conductors.

In this scenario, as per the National Electrical Code (NEC), when more than three conductors are installed in a raceway, the ampacity must be derated. However, referring specifically to general guidelines for 8 AWG conductors under these specific circumstances still leads to the consideration of 55 A as the correct ampacity. After applying the necessary derating factors based on the number of conductors present and the ambient temperature, 55 A remains the appropriate response for the installation.

Therefore, choosing