What must be done to ensure a de-energized system remains de-energized during work?

• A. The system must be grounded
• B. The system should be turned back on
• C. Insulate all conductors
• D. Leave as is

Answer: (A)

Grounding a de-energized system provides a safe, low-impedance path to earth for any residual or induced energy, so the equipment remains at earth potential during work. Even after power is removed, stored energy in capacitors or voltages induced by nearby energized lines can linger. A grounding connection drains that energy, preventing unexpected re-energization while you’re working. Turning the power back on would re-energize the system, defeating the safety purpose. Insulating conductors helps prevent contact but doesn’t remove existing voltage or discharged energy, and leaving things as is leaves the hazard unaddressed. Grounding is the reliable way to keep the system truly de-energized throughout the task.