What is the minimum length of a pull box that can be placed in a 2 inch conduit run where the conductors will be pulled straight?

The minimum length of a pull box placed in a conduit run is determined to ensure that there is sufficient space for handling and pulling the conductors without damaging them. When conductors are pulled straight through a pull box, it's essential that the box length accommodates their size and allows for a safe and efficient pull.

The National Electrical Code (NEC) provides guidelines for pull box sizes based on the number and size of conductors being pulled. For a conduit with a diameter of 2 inches, a minimum pull box length of 16 inches is specified when conductors are pulled straight. This length allows for easier maneuverability of the wires and accommodates the bends and curves they may take within the box, ultimately preventing potential issues such as kinking or fraying.

In contrast, lengths such as 12 inches, 20 inches, and 24 inches do not meet the minimum requirement properly, either being too short to allow for a safe pull or exceeding the necessary length without additional functionality. The emphasis on 16 inches is particularly relevant as it strikes a balance between meeting the safety standards and practical handling of the conductors during installation.