Is it acceptable to lock a circuit breaker if it serves as the disconnecting means?

A circuit breaker that serves as the disconnecting means must remain accessible at all times for safety reasons. This means that personnel should be able to quickly reach and operate the circuit breaker in the event of an emergency, such as a fire or electrical hazard. If a circuit breaker is locked, it may impede access during a critical moment, which could potentially endanger lives and property.

Additionally, electrical code regulations often specify that disconnecting means should be located in readily accessible locations to ensure that anyone who needs to operate the circuit, such as first responders or electrical personnel, can do so without delay. Therefore, keeping the circuit breaker unlocked and easily accessible aligns with these safety standards and practices.