What safety measure should be taken before starting work on electrical systems?

Before starting work on electrical systems, the most critical safety measure is to disconnect power to the circuit and verify that it is indeed off. This is fundamental in ensuring that there is no flow of electricity to the equipment or wiring you will be working on. Disconnecting the power prevents any accidental electrocution or electrical burns, as working on live circuits poses a significant hazard. The verification step, typically done with a reliable testing device, confirms that power has been successfully removed, providing an additional layer of safety.

While using a multimeter to check voltage is an important procedure to ensure the circuit is de-energized, it is only effective after the circuit has been disconnected. Notifying building occupants can be good practice to keep them informed and safe, but it does not directly protect the electrician when starting work. Wearing insulated gloves is also essential, but relying solely on this safety gear does not eliminate the risk posed by live wires. Taking the step to disconnect and verify power is the most effective way to ensure a safe working environment before beginning any electrical work.