A 2-inch raceway is to be installed in a pull box for a straight pull. Conductors are 4 AWG. What is the minimum length of the pull box (inches)?

A 2-inch raceway is to be installed in a pull box for a straight pull. Conductors are 4 AWG. What is the minimum length of the pull box (inches)?

• A. 4 in.
• B. 16 in.
• C. 12 in.
• D. 24 in.

Answer: (B)

The main idea is that for a straight pull, the pull box must be long enough to let all conductors pass through without bending or damage. The standard guideline for a straight pull is to allocate a per-conductor length, and multiply by the number of conductors in the box. Here, with 4 AWG conductors, you’ll have four conductors entering the pull box (two hots, a neutral, and a grounding conductor). The per-conductor allowance is four inches, so the minimum box length needed is four times four, which is sixteen inches. The 2-inch raceway shows the largest conductor size that can fit, but it doesn’t change the calculation—the box length is driven by the number of conductors. The other options are too short or longer than necessary for this conductor count.

The main idea is that for a straight pull, the pull box must be long enough to let all conductors pass through without bending or damage. The standard guideline for a straight pull is to allocate a per-conductor length, and multiply by the number of conductors in the box.

Here, with 4 AWG conductors, you’ll have four conductors entering the pull box (two hots, a neutral, and a grounding conductor). The per-conductor allowance is four inches, so the minimum box length needed is four times four, which is sixteen inches.

The 2-inch raceway shows the largest conductor size that can fit, but it doesn’t change the calculation—the box length is driven by the number of conductors. The other options are too short or longer than necessary for this conductor count.