What should be checked immediately before re-energizing equipment after maintenance?

• A. Document the action.
• B. Verify absence of voltage.
• C. Engage with power.
• D. Color code of field devices.

Answer: (B)

The essential safety check before re-energizing is to confirm there is no voltage present. This verification ensures that all energy sources have been properly isolated and that any stored or residual energy in the equipment has been released, so touching or powering it up won’t cause shock or an arc flash. Use a properly rated voltage tester and follow the established procedure—test the circuit to verify zero voltage, and confirm the testing instrument is functioning by testing on a known live source before and after the zero-voltage check. Lockout/tagout devices should remain in place until this verification is complete and it’s safe to re-energize.

Documenting the action is part of the process, but it doesn’t by itself guarantee safety. Engaging with power would defeat the purpose of the safety check, and the color coding of field devices helps with identification rather than confirming that the circuit is de-energized. The key step that directly protects you before re-energizing is verifying absence of voltage.