Which of the following is a safety procedure before working on electrical systems?

Using insulated tools is a critical safety procedure before working on electrical systems because these tools are specifically designed to protect the user from electric shock. Insulated tools have non-conductive coatings that can withstand high voltage, providing a barrier between the user and any electrical currents. This allows electricians and technicians to perform their work more safely, minimizing the risk of injury from accidental contact with live electrical components.

When working on electrical systems, ensuring personal safety is paramount, and utilizing insulated tools is a proactive approach to preventing accidents. This practice is supported by safety regulations and guidelines that emphasize the importance of proper equipment to maintain a safe working environment.

The other safety measures, while important, do not provide the same direct protection against electrical shock as using insulated tools. For instance, working during daylight hours may enhance visibility but does not mitigate the risks associated with electrical hazards. Similarly, the buddy system is a good practice for emergency assistance, but it does not inherently reduce the chances of accidental electric shock. Lastly, using lockout/tagout procedures is essential for ensuring that equipment is properly shut off and unable to be turned on during maintenance, making the option of "absolutely no use of lockout/tagout" unsafe and contrary to best practices in electrical safety.