What safety measure should always be taken before working on live electrical circuits?

Ensuring all power is turned off is a critical safety measure before working on live electrical circuits because it significantly reduces the risk of electric shock or injury. When the power is off, there is no electrical current flowing through the circuits, which means that the worker can perform tasks safely without the danger of electrocution. This standard practice is a fundamental part of safety protocols in electrical work and is emphasized in many electrical safety guidelines and regulations.

While other measures such as using insulated gloves, creating a detailed work plan, and employing non-conductive tools are indeed important in maintaining safety, they do not replace the necessity of de-energizing the circuit before beginning any work. Turning off the power is the first and foremost step that must be taken to create a safe working environment.