If electrical power is necessary to effect mechanical isolation, what takes priority?

If electrical power is necessary to effect mechanical isolation, what takes priority?

• A. Mechanical isolation
• B. Electrical isolation
• C. Ventilation isolation
• D. Fire suppression

Answer: (A)

Physical separation of the system takes priority. In damage-control thinking, stopping the hazard from moving or energizing flows comes from establishing a mechanical barrier first—closing valves, shutting bulkheads, sealing compartments—to cut off the path of energy or material. If you need electrical power to operate the device that creates that barrier, you still pursue the mechanical isolation because it directly stops the hazard. Once that barrier is in place, you can then address electrical power to keep the system de-energized. Ventilation isolation and fire suppression are important, but they come after securing the primary mechanical isolation.

Physical separation of the system takes priority. In damage-control thinking, stopping the hazard from moving or energizing flows comes from establishing a mechanical barrier first—closing valves, shutting bulkheads, sealing compartments—to cut off the path of energy or material. If you need electrical power to operate the device that creates that barrier, you still pursue the mechanical isolation because it directly stops the hazard. Once that barrier is in place, you can then address electrical power to keep the system de-energized. Ventilation isolation and fire suppression are important, but they come after securing the primary mechanical isolation.