Journeyman Electrician Exam (NEC)Equipment and DevicesEasy
A journeyman electrician is inspecting a new installation of a 400-ampere, 208Y/120-volt service. What is the maximum permitted height of the operating handle of the service disconnecting means when in its highest position?
- A6 feet 0 inches
- B6 feet 7 inches
- C7 feet 0 inches
- D5 feet 6 inches
Show answer & explanationAnswer & explanation
Correct answer: B. 6 feet 7 inches
According to NEC Section 230.77, the service disconnecting means shall be installed so that the operating handle of the switch or circuit breaker, when in its highest position, is not more than 6 feet 7 inches (2.0 m) above the working platform or grade level.
Why the other options are wrong
- A. This height is below the maximum permitted but is not the specified maximum.
- C. This height exceeds the maximum permitted by NEC 230.77.
- D. This height is below the maximum permitted but is not the specified maximum.
Service Disconnect Handle Height
The maximum vertical height of the operating handle for a service disconnecting means, from the working platform or grade level, as specified by the NEC.
- Ensures accessibility for all users during an emergency.
- Applies to service switches or circuit breakers.
- Measured when the handle is in its highest operating position.
Memory trick: Six feet seven, for safety heaven!