If 30 AWG THHN copper conductors have a base ampacity of 30 A, what is the adjusted ampacity after applying a 0.87 adjustment factor?

To determine the adjusted ampacity after applying an adjustment factor, you start with the base ampacity of the conductor, which in this case is 30 A for 30 AWG THHN copper conductors. The adjustment factor given is 0.87.

The adjusted ampacity can be calculated by multiplying the base ampacity by the adjustment factor:

Adjusted Ampacity = Base Ampacity × Adjustment Factor

Adjusted Ampacity = 30 A × 0.87

Calculating this gives:

Adjusted Ampacity = 26 A

It seems there was a miscalculation in the answer provided. The adjusted ampacity should actually be 26 A, making option B the correct choice based on the calculation provided here.

To summarize, if you want to find the adjusted ampacity, you multiply the base ampacity by the adjustment factor, leading to a final figure that accurately reflects the conditions applied. This process is essential in ensuring that conductors operate within their safe limits under varied circumstances.