When can a service disconnecting means be powered without suitable manual opening capability?

According to the National Electrical Code, manual opening capability for service disconnecting means is a crucial safety feature. A service disconnecting means must be able to be opened manually to ensure that personnel can safely isolate the electrical supply for maintenance or during emergencies. The requirement for manual operation addresses the need for safety, allowing for the de-energization of service equipment without reliance on powered mechanisms that could fail or malfunction.

In the context of the choices provided, the stipulation that service disconnects should never be powered without this capability emphasizes the importance of ensuring safe accessibility and manual control at all times. Such strict requirements prevent scenarios where individuals could be exposed to energized circuits unintentionally. This reflects the NEC's overall commitment to safety in electrical installations, ensuring that there are always reliable means of disconnect that can be operated manually to remove power safely.