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

To determine the maximum number of 2/0 AWG THHN/THWN conductors that can be installed in an 8" x 8" wireway, it's important to reference the National Electrical Code (NEC) guidelines regarding conductor fill within raceways and wireways. This calculation considers both the cross-sectional area of the wireway and the fill allowance for each type of conductor.

The 2/0 AWG THHN/THWN conductors have a specific cross-sectional area, and the total area of the 8" x 8" wireway must be calculated to determine how many conductors can fit within it without exceeding the allowable fill. The NEC provides a detailed table outlining the maximum fill requirements, which stipulate that for a wireway, the fill must not exceed a certain percentage depending on the number of conductors—typically 40% for three or more conductors.

By applying these calculations, it is established that the maximum number of 2/0 conductors that can physically fit while complying with NEC fill requirements in the wireway dimensions specified comes out to be 57. This aligns with the answer choice selected, making it the correct choice. Knowing how to perform these calculations is crucial for ensuring safety