NEC Commercial Electrical Practice Test

What is the minimum vertical clearance required for service drops over residential properties where the voltage does not exceed 300 volts to ground?

1. 10 ft

2. 12 ft

3. 15 ft

4. 18 ft

The correct answer is: 12 ft

The minimum vertical clearance required for service drops over residential properties where the voltage does not exceed 300 volts to ground is indeed 12 feet. This clearance specification is set to ensure safety and prevent accidental contact with the overhead conductors, particularly in areas where a potential risk exists, such as driveways or places where people may be present. The 12-foot clearance allows for the safe passage of vehicles, pedestrians, and any other activities that might occur under those lines. Additionally, it helps mitigate risks related to adverse weather conditions, such as snow or ice, that may cause lines to sag lower than their normal position. Overall, ensuring a minimum vertical clearance of 12 feet is a crucial aspect of electrical safety standards, aiming to protect both individuals and infrastructure below the lines.