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

The minimum circumference at the top of a Class 2 Douglas fir pole is established by industry standards for wooden utility poles. For Class 2 poles, the requirement is a minimum circumference of 25 feet. This specification is important as it ensures that the poles have adequate structural integrity to support the weight of the equipment attached to them, as well as to withstand environmental stresses such as wind and snow loads.

Therefore, the choice of 25 feet aligns with the criteria set forth for Class 2 Douglas fir poles, making it the correct answer. Other figures provided in the options might exceed regulatory or industry standards for this classification, but they do not represent the minimum acceptable requirement necessary for the intended use of Class 2 poles.