NEC Commercial Electrical Practice Test

What is the required minimum height above finished grade for the point of attachment of 120/240 volt service drop conductors?

1. 8 ft

2. 10 ft

3. 12 ft

4. 15 ft

The correct answer is: 10 ft

The required minimum height above finished grade for the point of attachment of 120/240 volt service drop conductors is established to ensure safety and compliance with the National Electrical Code (NEC). This height requirement is designed to prevent accidental contact with the live conductors, particularly from people, vehicles, or other equipment that may be present near a building or installation. In the case of service drops, a height of at least 10 feet is specified for the point where the conductors connect to a building. This standard minimizes the risk of contact and potential hazards. By setting this minimum height, the NEC aims to establish a safe working environment and to protect both the electrical infrastructure and the public. Other options represent heights that do not align with the code's standards for residential service drops. The minimum requirement of 10 feet provides a suitable balance between accessibility for maintenance and the necessary clearance for safety.