Which is a correct step in lockout/tagout procedure before electrical maintenance?

• A. Identify energy sources, isolate equipment, apply lockout devices, attach warning tags, verify zero energy
• B. Immediately energize equipment to test
• C. Remove locks before work
• D. Do not verify zero energy.

Answer: (A)

Lockout/tagout procedures are about ensuring equipment stays de-energized during maintenance so workers aren’t exposed to unexpected energy release. The proper steps begin with identifying all energy sources that could energize the equipment, so nothing is overlooked. Then you isolate the equipment from those sources, cutting off the power path. Applying lockout devices physically prevents anyone from re-energizing the equipment, and attaching warning tags communicates that maintenance is in progress and who is responsible. After those controls are in place, you verify zero energy to confirm that all energy stores—electrical, stored mechanical, hydraulic, pneumatic, or thermal—have been released or blocked and that a dead circuit cannot be energized even if someone attempts to re-enable a circuit. Only with verified zero energy should work proceed.

Energizing the equipment to test would defeat the purpose of the procedure and create a hazardous situation. Removing locks before work would allow energy to flow again, defeating the safeguards. Not verifying zero energy would leave the system potentially energized or capable of quickly re-energizing, which is unsafe.