How many 6 AWG THWN/THHN conductors can fit in a 10" x 10" wireway?

To determine how many 6 AWG THWN/THHN conductors can fit in a 10" x 10" wireway, it is essential to consider the maximum allowable fill capacity of the wireway. According to the National Electrical Code (NEC), the allowable fill for conductors within a wireway is based on their size and type.

6 AWG THWN/THHN conductors have a specific cross-sectional area that contributes to the overall fill calculations. When you calculate the total area of the wireway (which is 10" x 10", equating to 100 square inches), you then apply the NEC's filling requirements to find out how many conductors can safely fit.

The NEC typically allows a certain percentage of the wireway's cross-sectional area to be filled with conductors, with a common guideline being that if the conductors are all of the same size, the maximum fill is 40% of the wireway's area in most situations.

Knowing that the cross-sectional area of a 6 AWG wire is about 0.6533 square inches, you can compute the total area available and divide that by the area taken by a single conductor. This calculation leads to the conclusion that approximately