What should be checked before working on any electrical panel?

Before commencing any work on an electrical panel, it is vital to ensure that the circuit is de-energized. This step is crucial for safety reasons, as working on an energized circuit can lead to electric shock, injury, or even fatality. De-energizing the circuit means that all sources of electrical power are removed, ensuring that no current can flow through the system while you are working on it. This precaution creates a safe working environment and allows for the safe handling of tools and equipment.

While ensuring that all circuit breakers are turned on, proper labeling of the panel, and the absence of water near the panel are also significant considerations in electrical work, they do not provide the same level of safety assurance as confirming that the circuit is de-energized. Proper labeling helps with identification for future work, and managing water presence is essential for general safety, but these actions do not directly protect against the immediate risks associated with working on live electrical components. Therefore, prioritizing the de-energization of circuits is the most critical step before any panel work.