What is the correct procedure for replacing a circuit breaker?

The correct procedure for replacing a circuit breaker involves ensuring safety by first turning off the main power. This is crucial as it eliminates the risk of electric shock during the replacement process. After confirming that the power is off, the old breaker can be safely removed. Once the old breaker has been taken out, the new breaker can be installed securely, ensuring that all connections are tight and that the breaker is properly seated in the panel.

This method emphasizes caution and guarantees that the circuit is completely de-energized before any work is done, which is a fundamental safety principle in electrical work. Turning off the main power provides the safest environment for the technician to operate, preventing any accidental contact with live parts, which could lead to severe injury or even fatality. Furthermore, it ensures that the entire circuit is powered down, rather than just the specific circuit, which may not be sufficient depending on the layout of the electrical panel and the configuration of the circuits connected.

In contrast, other methods might leave room for risk by either not completely shutting off the power or by reinstalling the new breaker before the old one is fully removed, which could lead to dangerous live connections during the process.