After testing is complete, what must be done to the systems?

After testing is complete, what must be done to the systems?

• A. Energize and test again
• B. Remove all tags
• C. Leave energized
• D. All systems must be deenergized

Answer: (D)

The key idea is that hazardous energy must be controlled so equipment can’t start up unexpectedly while people are working. Once testing is finished, all energy sources should be isolated and the system returned to a zero-energy state by deenergizing it. This prevents any accidental start-up or release of stored energy as a worker finishes the task. Keeping energy off and in a controlled state is the cornerstone of safe maintenance. Energizing again or leaving it energized would defeat that safety control, and removing the protective tags would allow re-energization. So the required action is to deenergize all systems.

The key idea is that hazardous energy must be controlled so equipment can’t start up unexpectedly while people are working. Once testing is finished, all energy sources should be isolated and the system returned to a zero-energy state by deenergizing it. This prevents any accidental start-up or release of stored energy as a worker finishes the task. Keeping energy off and in a controlled state is the cornerstone of safe maintenance. Energizing again or leaving it energized would defeat that safety control, and removing the protective tags would allow re-energization. So the required action is to deenergize all systems.