What is the minimum clearance above grade required for a service drop cable?

The minimum clearance above grade required for a service drop cable is set at 10 feet. This specification is crucial for ensuring safety and accessibility, particularly in areas where people may come into contact with the cable, such as driveways, yards, and walkways. The 10-foot clearance helps to prevent accidents and interference with vehicles, especially tall ones like trucks and buses, which could otherwise snag a low-hanging cable.

Furthermore, the National Electrical Code (NEC) sets these standards to maintain a uniform level of safety across installations. Ensuring the proper clearance of service drops helps protect both the cable itself from damage and individuals from potential electrical hazards. The other options, while somewhat reasonable in height, do not meet the minimum requirement established by the NEC, which is why they are not the correct answers.