Service-drop conductors must have a minimum clearance above final grade over residential properties and driveways of what height?

The correct answer is 10 feet because the National Electrical Safety Code (NESC) sets specific clearance requirements for service-drop conductors over residential properties and driveways to ensure safety. This height is designed to prevent accidents caused by vehicles and to provide ample space for people walking below the conductors.

Clearances are vital for electrical safety, as they help avoid potential hazards such as electric shocks or the risk of downed power lines. The 10-foot clearance is considered an established standard that balances safety for both everyday residential activities and the operational requirements of electrical service.

Other heights mentioned do not meet the NESC and local codes aimed at minimizing risks associated with electrical lines, particularly in areas frequently traversed by people or vehicles. Therefore, 10 feet is designated as the minimum standard for service-drop conductors over these areas. This helps maintain a safe environment while not compromising accessibility for utility service and maintenance.