Journeyman Electrician Exam (NEC)Equipment and DevicesMedium
A technician is installing a new service disconnect for a commercial building. According to NEC 230.70(A)(1), what is the maximum height above the finished grade or working platform that the operating handle of the service disconnecting means can be located?
- A6 feet 7 inches (2.0 meters)
- B5 feet 6 inches (1.67 meters)
- C6 feet 0 inches (1.83 meters)
- D6 feet 10 inches (2.08 meters)
Show answer & explanationAnswer & explanation
Correct answer: A. 6 feet 7 inches (2.0 meters)
NEC 230.70(A)(1) states that the service disconnecting means shall be installed at a readily accessible location outside of a building or structure or inside nearest the point of entrance of the service conductors. The operating handle of the service disconnecting means shall not be more than 6 feet 7 inches (2.0 m) above the finished grade or working platform.
Why the other options are wrong
- B. This height is too low; the maximum permitted height is higher.
- C. This height is too low; the maximum permitted height is higher.
- D. This height exceeds the maximum permitted height by the NEC.
Service Disconnect Handle Height
The operating handle of the service disconnecting means must be located not more than 6 feet 7 inches (2.0 meters) above the finished grade or working platform to ensure it is readily accessible.
- NEC 230.70(A)(1) specifies the height.
- Maximum height is 6 ft 7 in (2.0 m).
- Ensures easy access for operation and emergency shutdown.
Memory trick: Easy reach for the main switch, no higher than a tall person's stretch.