Why is it essential to perform a test for absence of voltage after locking out and tagging out?

• A. To confirm energy has been removed and the equipment remains de-energized.
• B. To verify color codes.
• C. To ensure the lock is properly engaged.
• D. To train new employees.

Answer: (C)

Testing for absence of voltage after applying lockout and tagging out verifies that the energy control is actually in effect and the equipment stays de-energized. This step ensures there is no electrical energy present that could re-energize the equipment during maintenance, confirming that the lock is properly engaged and doing its job. If voltage were detected, it would indicate the isolation isn’t complete and a hazardous re-energization could occur. The other options miss the safety focus: color codes don’t confirm de-energization, and training or simply confirming the lock is in place aren’t the immediate purpose of the voltage test.