What safety precaution should be taken when working with electrical circuits?

Using insulated tools is an essential safety precaution when working with electrical circuits. Insulated tools are specifically designed to prevent the user from completing a circuit with their body, which significantly reduces the risk of electrical shock or injury. The insulation on these tools provides a barrier between the user and the live electrical components, allowing work to be performed safely.

This practice is particularly important because even low voltages can be dangerous under certain conditions, and higher voltages can be fatal. Insulated tools help protect against accidental contact with live wires, which is a critical safety measure in electrical work.

The other options suggest practices that either promote unsafe assumptions or incomplete safety measures. For instance, assuming a circuit is not live could lead to serious accidents, while relying solely on rubber gloves without other protective measures does not provide comprehensive safety. Ignoring voltage ratings is also inherently unsafe, as it fails to regard the maximum handling capacity of equipment or the potential hazards of high voltage.