What is the minimum vertical clearance for overhead power lines above streets?

The minimum vertical clearance for overhead power lines above streets is established primarily for safety reasons, ensuring that vehicles and individuals can safely pass beneath the lines without the risk of contact. The correct answer indicates that the required clearance is 18 feet. This height accommodates most standard vehicles, including trucks and larger vehicles that may traverse roadways, while also considering the possible sagging of lines due to temperature changes or other factors.

In some contexts, the clearance may vary based on specific local codes and regulations, but 18 feet is a commonly accepted standard for public safety to prevent electrical hazards and maintain accessibility. Higher clearances are often required for areas with more significant traffic or where larger vehicles are common, but for standard street situations, 18 feet is typically sufficient.