What type of safety system is used on de-energized circuits?

The correct answer is focused on Lockout Tag Out (LOTO) procedures, which are crucial for ensuring safety during maintenance or servicing of electrical circuits. The Lockout Tag Out process involves isolating energy sources and using a locking mechanism to prevent the re-energization of equipment while it is being worked on. This comprehensive approach involves placing clear, visible tags on the locked-out equipment that inform others that the system is being serviced and cannot be operated.

This safety measure is particularly important because it protects workers from accidental energization, which could lead to serious injuries or fatalities. It serves as a signal to both the person working on the equipment and other employees that work is being conducted, and they should not attempt to operate the equipment until it has been properly cleared for use.

In contrast, other options such as general power-off, while relevant, may not include the comprehensive safety protocols of tagging and locking out equipment. Surge protection is designed to protect against voltage spikes rather than ensure personnel safety during maintenance. Emergency stop mechanisms are primarily for immediate operational safety in situations where equipment poses an uncontrolled risk, rather than for maintenance procedures. Hence, the emphasis on the detailed procedures within the Lockout Tag Out practice makes it the most effective and pertinent safety system for de-