Scout's Toolbox Talks

Lockout/Tagout for Electrical Work

Toolbox Talk:

Testing for Absence of Voltage Before Starting Work

June 22, 2025

Before beginning any electrical task, OSHA 1910.333(b)(2)(iv)(B) requires you to verify that circuits are de-energized. This means testing for absence of voltage — never just assuming power is off.

Why It Matters:
Many workers have been shocked or killed because they trusted a switch or breaker label. Voltage verification is your last line of defense against arc flash, electrocution, and fatal mistakes.

Key Points:

  • Use a properly rated, calibrated voltage tester for the specific voltage level you're working with.
  • Follow the “test-before-touch” method:
    1. Test your meter on a known live circuit.
    2. Test the circuit you plan to work on.
    3. Retest the meter on a live source to confirm it's working.
  • Always treat conductors as energized until testing proves otherwise.
  • Wear proper PPE and follow your site’s LOTO verification procedure.

✅ No voltage test = no safe work.

Ask the Crew:

  • Did we test every phase of the circuit?
  • Are we following the full test-before-touch process?

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