2. Lock-out / Tag-out (LO/TO). Purpose:To protect workers from the release of hazardous energy, and;To guard against the accidental start-up of equipment during service and maintenance.. 3. Energy Sources. Typical sources of energy that may need to be isolated, locked and tagged out include:Electrical (electric motors, batteries)Hydraulic (e.g. pressurized fluids in hoses/pipes)Pneumatic (e.g. pressurized air in hoses/pipes)Mechanical (e.g. gravity systems, or spring energy)Chemical (30021
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