Which action best supports maintaining energy isolation during maintenance?

Which action best supports maintaining energy isolation during maintenance?

• A. Isolate energy sources during maintenance to prevent unexpected startup or release of energy.
• B. Rely on memory of the power status after maintenance.
• C. Leave equipment energized and notify others after starting work.
• D. Annotate the status on a whiteboard and resume operation.

Answer: (A)

Maintaining energy isolation during maintenance means physically preventing all energy sources from delivering power to the equipment while work is done. This is achieved through proper energy-control procedures, such as lockout/tagout, where locks and tags are applied to energy-isolation points and the system is verified to be in a zero-energy state before work begins. This ensures the equipment cannot start unexpectedly or release stored energy, protecting workers from injuries. Relying on memory of power status is unsafe because conditions can change, and a mistaken assumption can lead to a dangerous restart. Leaving equipment energized and only notifying others does not guarantee that energy cannot be applied. Annotating a status on a whiteboard and then resuming operation likewise does not physically prevent energization or energy release. The best approach is to isolate energy sources and keep them isolated for the entire maintenance period, with verification to confirm zero energy before any work starts.

Maintaining energy isolation during maintenance means physically preventing all energy sources from delivering power to the equipment while work is done. This is achieved through proper energy-control procedures, such as lockout/tagout, where locks and tags are applied to energy-isolation points and the system is verified to be in a zero-energy state before work begins. This ensures the equipment cannot start unexpectedly or release stored energy, protecting workers from injuries.

Relying on memory of power status is unsafe because conditions can change, and a mistaken assumption can lead to a dangerous restart. Leaving equipment energized and only notifying others does not guarantee that energy cannot be applied. Annotating a status on a whiteboard and then resuming operation likewise does not physically prevent energization or energy release. The best approach is to isolate energy sources and keep them isolated for the entire maintenance period, with verification to confirm zero energy before any work starts.