What is the minimum top circumference for a Class 2 Douglas fir pole?

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Multiple Choice

What is the minimum top circumference for a Class 2 Douglas fir pole?

Explanation:
The strength of a utility pole is closely tied to its cross‑section at the top, which is described by the top circumference. For a Class 2 Douglas fir pole, the standards specify the smallest top circumference that provides enough bending strength for the expected loads. That threshold is 25 inches, which corresponds to roughly an 8‑inch top diameter. This size is the minimum needed to meet Class 2 requirements; a smaller circumference wouldn’t meet the standard, while larger circumferences exceed the minimum and aren’t necessary for Class 2.

The strength of a utility pole is closely tied to its cross‑section at the top, which is described by the top circumference. For a Class 2 Douglas fir pole, the standards specify the smallest top circumference that provides enough bending strength for the expected loads. That threshold is 25 inches, which corresponds to roughly an 8‑inch top diameter. This size is the minimum needed to meet Class 2 requirements; a smaller circumference wouldn’t meet the standard, while larger circumferences exceed the minimum and aren’t necessary for Class 2.

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