Journeyman Electrician Exam (NEC)Equipment and DevicesMedium
A technician is installing a new service disconnect for a commercial building. The disconnect handle is required to be readily accessible. According to NEC 230.72(C), what is the maximum height above the working platform or grade level for the center of the grip of the operating handle of the disconnect switch?
- A2.0 m (6.5 ft)
- B2.2 m (7.25 ft)
- C1.7 m (5.5 ft)
- D2.5 m (8.2 ft)
Show answer & explanationAnswer & explanation
Correct answer: A. 2.0 m (6.5 ft)
NEC 230.72(C) specifies that the operating handle of the service disconnecting means shall be no higher than 2.0 m (6.56 ft) above the working platform or floor level. This ensures that the disconnect can be operated safely and easily by personnel.
Why the other options are wrong
- B. 2.2 m (7.25 ft) exceeds the maximum permitted height for a service disconnect handle.
- C. 1.7 m (5.5 ft) is below the maximum permitted height but not the specified maximum.
- D. 2.5 m (8.2 ft) significantly exceeds the maximum permitted height.
Service Disconnect Height
The maximum mounting height for the operating handle of a service disconnecting means, as specified by the National Electrical Code, to ensure ready accessibility.
- NEC 230.72(C) sets the limit.
- Maximum 2.0 m (6.56 ft) above working platform.
- Ensures safe and easy operation.
Memory trick: Disconnect Height: Don't Reach, Just Grab.