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Lockout Tagout (LOTO)

Definition - What does Lockout Tagout (LOTO) mean?

The term lockout tagout (LOTO) refers to a safety procedure that ensures that dangerous machines and energy sources are properly shut off and not unexpectedly started up before the completion of maintenance or servicing work. These energy sources could include electrical, mechanical, hydraulic, pneumatic, chemical, radiation, and thermal hazards. The point of a LOTO procedure is to identify a hazard that may injure or even kill employees if such an incident occurs due to the startup or release of stored energy during the maintenance of machines and equipment.

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Safeopedia explains Lockout Tagout (LOTO)

Lockout tagout (LOTO) procedures ensure that the hazardous power sources are isolated and rendered inoperative before any maintenance work is started. Usually, a lock is used that prevents the power source from switching on. A tag affixed to the locked device cautions that it should not be turned on.

LOTO describes a safe work procedure and identifies tasks and equipment that may expose employees to hazardous energy. It also identifies hazardous energy sources and adjacent equipment. It prevents accidental energizing and unauthorized reactivation of machines, equipment or energy sources. A maintenance employee must ensure the LOTO procedure is followed before beginning of work and on completion he or she must verify that all personnel are clear of danger before re-energizing the system.

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