Scout's Toolbox Talks

Lockout/Tagout for Electrical Work

Toolbox Talk:

Test Before You Touch — Always Verify Zero Energy

June 22, 2025

Even after applying locks and tags, you must test equipment to confirm it is de-energized before working on it. This is a critical OSHA requirement under 1910.333(b)(2)(iv) and 1926.417.

Why It Matters:
Assuming equipment is de-energized without verification has led to serious injuries and deaths. Voltage can remain due to wiring errors, residual charge in capacitors, or failure to isolate all sources.

Key Points:

  • Use a properly rated voltage tester to check for the presence of voltage before starting any work.
  • Always test the tester on a known live source first, then test the circuit, then re-test the tester — this is called the “Live-Dead-Live” method.
  • Wear appropriate PPE during testing in case voltage is still present.
  • Only qualified persons should perform this testing under OSHA’s electrical safety standards.
  • Never let pressure or deadlines cause you to skip this step.

✅ If you don’t test, you don’t know — and guessing isn’t safe.

Ask the Crew:

  • Who is verifying zero energy before we begin?
  • Are our testers rated and working properly?