What is the calculated minimum width of the pull box shown in the reference figure?

To determine the calculated minimum width of the pull box, various factors come into play based on the National Electrical Code (NEC) requirements and industry standards. The minimum width is often derived from the number and size of conductors that need to pass through or be housed in the pull box and also takes into account the necessary space for bending these conductors safely.

In this case, a width of 37 inches has likely been calculated considering the specific dimensions of the equipment, the types of cables involved, and ensuring there is adequate room for maintenance and operation without risking damage to the conductors. The pull box needs to accommodate bending radius requirements for the types of cables, which in turn dictates necessary dimensions.

This reasoning suggests that having a minimum width of 37 inches is appropriate. It balances the need for physical space for conductors and adding a margin to comply with safety considerations laid out in installation standards. Higher or lower dimensions would not provide the same level of operational efficiency or safety, which reinforces the correctness of 37 inches in this context.