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Shut it off, then bring it back.

Reach for this before work on anything fed by power, gas, water, pressure, or stored energy.

A unit that looks off can still be fed, and energy that returns during work can injure someone.

Step by step

7
  1. List every energy source

    A qualified person lists power, control circuits, gas, water, pressure, stored charge, and backup sources like generators, solar, or batteries.

    Write down · Note
  2. Do not count a stop as a shutoff

    Emergency stops, wall switches, timers, tripped breakers, and tags alone do not show anything is isolated.

    Write down · Note
  3. Lock out each source

    A qualified person isolates each source upstream, valves included. Each worker adds a personal lock and records it.

    Write down · Note
  4. Release stored energy

    A qualified person bleeds pressure and discharges stored charge, then watches it fall. Closed valves can still hold pressure behind them.

    Write down · Reading
  5. Check at the work point

    A qualified person proves the tester on a known live source, tests at the work point, then proves it again.

    Write down · Reading
  6. Recheck after any absence

    Anyone who left the area tests again on return. A new or unlisted source stops the work until it is found.

    Write down · Decision
  7. Restore in order

    A qualified person counts tools and jumpers, clears people, and restores safeties. Only the person who placed a lock removes it.

    Write down · Note
Done when

A finished run leaves the source list, lock points with names, readings at the work point, and the restore steps.

General guidance for a qualified person, not a finding about any home. The person on site decides.