The maximum number of 2/0 AWG THHN/THWN conductors that can be installed in an 8" x 8" wireway is?

To determine the maximum number of 2/0 AWG THHN/THWN conductors that can be installed in an 8" x 8" wireway, it's essential to refer to the National Electrical Code (NEC) and applicable conductor fill calculations.

The NEC specifies that the fill capacity of wireways, conduits, or other raceways is based on the size of the conductors and the overall available area inside the raceway. For instance, 2/0 AWG conductors have a specific cross-sectional area that is considered when calculating how many can fit within a given volume.

In this scenario, the 8" x 8" wireway provides a substantial area, allowing a significant number of conductors to be installed while still adhering to NEC fill requirements that prevent overheating and ensure safe operation. The specific calculation leads to the conclusion that 57 is the right number of conductors that can safely fit without exceeding fill limitations or compromising the performance of the conductors.

Thus, the correct answer reflects not only strict adherence to regulations but also practical safety considerations in electrical installations.