What is the formula for determining pole depth when setting a pole?

Determining the correct pole depth is crucial for ensuring the stability and safety of utility poles. The formula that includes 10 percent of the pole's total height plus a depth of 2 feet is commonly used in the industry. This approach allows for adequate embedding of the pole to resist various forces, such as wind and lateral load, providing structural integrity.

When applying this formula, the 10 percent factor accounts for the portion of the pole that should be buried in the ground to ensure it has enough resistance against upheaval and instability. The additional 2 feet aids in further securing the pole in the soil, helping to prevent shifting and ensuring that it can withstand environmental stresses.

This formula effectively addresses the conditions most poles encounter, aligning with standard practices in the field. The other choices reflect variations that are not as widely accepted or proven effective in practical applications.