What is the smallest metal wireway that can be used for the service "gutter" for a 3Ø, 4-W feeder consisting of eight 600 kcmil conductors?

The correct answer is determined by calculating the required space needed to accommodate the eight 600 kcmil conductors within a service "gutter." When determining the size of wireways, it is essential to reference the National Electrical Code (NEC) for proper sizing, which considers factors such as conductor size, number of conductors, and their insulation type.

For eight 600 kcmil conductors, we first need to establish the proper conductor fill based on their dimensions. The NEC provides guidelines for the minimum width and height of wireways needed for various configurations of conductors. Given that 600 kcmil conductors are relatively large, the wireway must provide enough space not only for the conductors themselves but also for any additional required working space and heat dissipation.

The 10 x 10 wireway is an adequate choice because it offers sufficient cross-sectional area to ensure that the eight conductors can be effectively housed without exceeding fill limits established by the NEC. This size allows for the proper arrangement and installation of the conductors while adhering to safety standards regarding overheating and accessibility.

In contrast, smaller sizes such as 6 x 6 or 8 x 8 may not provide the necessary space required for safe and efficient installation of