What is an important safety measure when working on live circuits?

Disconnecting the power before beginning work on live circuits is crucial for safety. This practice significantly reduces the risk of electrical shock, injury, or potential fatality. When power is disconnected, workers can handle wires and components without the fear of electrical current flowing through their bodies, allowing them to focus on repairs or installations without distraction.

It's important to note that although wearing rubber gloves is a common safety measure, relying solely on them while working on live circuits does not eliminate risks, especially if gloves are worn incorrectly or if they are damaged. Using metal tools is not advisable in this context because metal conducts electricity, which can pose serious hazards when applied to live circuits. Keeping the circuit energized for testing purposes can also lead to dangerous situations where accidental contact with components may occur, further emphasizing why disconnecting the power is the best and safest approach before starting any work.