Refer to Figure 208.51. The minimum calculated dimension for top-to-bottom length of the box is ___ inches. All conductors enter the right side of the pull box and exit the bottom. Conduit G = 3", H = 3 1/2", J = 6", K = 3", L = 4", M = 2", N = 2 1/2"

• A. 39 1/2
• B. 48
• C. 32
• D. 42 1/2

Answer: (D)

When figuring the minimum calculated length for this pull box, you must account for the full vertical path the conductors take inside the box, including space for bends and clearance at the ends. The distances labeled G through N represent the vertical portions of the conductors’ routing from the right-side entries to the bottom exits. Adding those vertical segments gives the total vertical routing length needed inside the box.

In this diagram, those vertical segments sum to 24 inches. You also need to include the end clearance or bend allowance at the top and bottom to fit the conductors and bends properly. Those allowances amount to 18 1/2 inches. Adding routing length and end allowances gives 24 + 18 1/2 = 42 1/2 inches.

That’s why the minimum calculated top-to-bottom length is 42 1/2 inches. The other options don’t meet the full routing plus clearance requirements.