For a pull box in a straight pull of 2-in. raceways, the length of the pull box must be a minimum of how many times the trade diameter?

In the context of NEC Article 314, when dealing with straight pulls in raceways, specific dimensions for pull boxes are outlined to ensure safe and effective cable management. For a straight pull involving 2-inch raceways, the requirement is that the length of the pull box must be a minimum of 8 times the trade diameter of the raceway.

This dimension is critical because it allows adequate space for bending the conductors without exceeding their bending radius, which could potentially damage the conductors or insulation. By mandating that the pull box be 8 times the trade diameter, the code ensures that there is enough room to maneuver the wires during installation and maintenance, facilitating a safe and efficient connection.

Other options listed do not meet the NEC requirements for pull boxes in a straight pull configuration. Therefore, the correct specification in this case is the minimum of 8 times the trade diameter.