What is the ampacity of each 12 AWG conductors in ambient temperature of 32°C with twelve 12 AWG THHN conductors?

Determining the ampacity of electrical conductors involves several factors, including the gauge of the wire, the ambient temperature, and the number of conductors being used together.

For 12 AWG THHN conductors, the base ampacity at an ambient temperature of 30°C is typically around 30 amps for a single conductor, according to the National Electrical Code (NEC). However, when multiple conductors are installed together, a derating factor applies to prevent overheating.

In this scenario, with twelve 12 AWG conductors present, the derating would significantly reduce the allowable ampacity. Commonly, for more than three conductors, the NEC specifies a reduction in ampacity by a certain percentage. For twelve conductors, it is common to apply a derating factor, often resulting in the ampacity being cut down considerably when multiple conductors are grouped together.

The ambient temperature of 32°C is slightly above the standard reference temperature of 30°C. While it would usually imply a further reduction in ampacity, for the purpose of this calculation and typical derating practices involving multiple conductors, the resulting ampacity aligns closely with values referenced in practical scenarios and tables provided in electrical codes and standards.

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