What is the minimum top-to-bottom length, in inches, for the pull box under the described side-to-adjacent side conduit arrangement?

What is the minimum top-to-bottom length, in inches, for the pull box under the described side-to-adjacent side conduit arrangement?

• A. 33 in.
• B. 44 in.
• C. 30 in.
• D. 32 in.

Answer: (A)

The concept being tested is how the physical dimensions of a pull box are determined by how conduits enter it and how much space is needed to pull conductors through. When conduits enter from adjacent sides, there isn’t as much straight, open space for the wires to bend and maneuver as there would be if the entries were on opposite sides, so more vertical room is required to accommodate the pull path while keeping conductors clear of the box walls and meeting fill requirements. The NEC provides a table of minimum top-to-bottom (height) dimensions for different entry patterns, and for side-to-adjacent side connections the minimum height is 33 inches. This height gives enough room to layout and bend the conductors and still comply with box-fill limits. Heights shorter than that don’t provide sufficient room for the pull, while a taller height isn’t needed for the minimum requirement, so 33 inches is the correct minimum.

The concept being tested is how the physical dimensions of a pull box are determined by how conduits enter it and how much space is needed to pull conductors through. When conduits enter from adjacent sides, there isn’t as much straight, open space for the wires to bend and maneuver as there would be if the entries were on opposite sides, so more vertical room is required to accommodate the pull path while keeping conductors clear of the box walls and meeting fill requirements. The NEC provides a table of minimum top-to-bottom (height) dimensions for different entry patterns, and for side-to-adjacent side connections the minimum height is 33 inches. This height gives enough room to layout and bend the conductors and still comply with box-fill limits. Heights shorter than that don’t provide sufficient room for the pull, while a taller height isn’t needed for the minimum requirement, so 33 inches is the correct minimum.