What must a power operated switch or circuit breaker be able to do during a power failure?

A power-operated switch or circuit breaker must be able to be opened by hand during a power failure to ensure that it can be safely controlled when electrical power is not available. This is crucial in situations where an electrical fault may have occurred, or when maintenance is required, as it enables a user to manually disconnect the circuit or equipment without relying on power-operated mechanisms that would be inactive during a failure.

This requirement aligns with safety practices outlined in the National Electrical Code, which aim to provide methods for controlling electrical systems even in emergency situations. Maintaining the ability to open a switch or breaker manually ensures that personnel can address hazards or emergencies without delay, thereby promoting safety and operational efficiency.