Which action is NOT part of the proper procedure when working on electrical circuits?

Working with one hand only is not part of the proper procedure when working on electrical circuits. The correct approach is to use both hands when feasible to maintain balance and minimize the risk of completing a circuit through your body, which can happen if you touch both a live part and a grounded surface. This can lead to severe electrical shocks or injuries.

In contrast, shutting off the power is a critical first step to ensure safety before performing any electrical work. Locking and tagging the panel is an important practice to prevent accidental re-energizing of the circuit, keeping workers safe while they are conducting repairs. Carrying keys to locks is also essential, ensuring that the person performing the work has access to the necessary keys while maintaining control over the situation and preventing unauthorized access to the electrical panel. Each of these actions promotes safety and prevents accidents when working with electrical systems.