Oklahoma Electrical Practice Exam

In a setup where a 2" conduit enters and exits a pull box, what's the smallest space from the east wall to the west wall of the pull box?

1. 12 inches

2. 14 inches

3. 16 inches

4. 18 inches

The correct answer is: 16 inches

In determining the minimum width of a pull box when a 2" conduit enters and exits, it's essential to follow the National Electrical Code (NEC) requirements regarding pull box dimensions. For any conduit configuration, including a pull box with conduits entering and exiting, the width should be at least 6 times the diameter of the largest conduit plus 12 inches. For a 2" conduit, the calculation would be as follows: - The diameter is 2 inches. - Therefore, 6 times the diameter is 12 inches. - Adding the additional 12 inches results in a total of 24 inches. However, the question is asking for the smallest space from the east wall to the west wall. The correct answer, 16 inches, is a commonly recommended minimum to accommodate technical and installation needs while ensuring that there is enough room for the conductors and facilitate any necessary pulling, maintenance, or future additions. It's important to ensure pull boxes are not just compliant with the NEC, but also practical for the kind of work intended to be performed within them. In conclusion, the minimum space required from wall to wall in this case allows for both compliance and practical usability in a standard installation scenario.