The smallest diameter of conduit allowed for width calculations in a pull box configuration is what measurement?

In conduit width calculations for pull box configurations, the smallest diameter of conduit allowed is crucial for ensuring that there is sufficient space for the conductors and to facilitate easy pulling. The National Electrical Code (NEC) specifies that when determining the allowed conduit sizes for pull boxes, the minimum size considered should be 2 inches. This standard helps to maintain the integrity of the installation, avoid damage to the conductors, and ensure safe operation.

Using a minimum size of 2 inches allows for effective bending radius and pulling of wire while also considering the heat dissipation and the number of conductors that can safely fit within the conduit. A larger diameter conduit, while permissible, would not be the minimum requirement. Therefore, the correct minimum size for conduit in width calculations related to pull boxes is 2 inches.