Lockout–tagout

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Lock out, tag out or lockout/tagout (LOTO) is a safety procedure that ensures dangerous equipment is properly shut off and not able to be restarted prior to the completion of maintenance or repair work. It requires that hazardous energy sources be "isolated and rendered inoperative" before work is started on the equipment in question. The isolated power sources are then locked and a tag is placed on the lock identifying the worker and reason the LOTO is placed on it. The worker then holds the key for the lock, ensuring that only that worker can remove the lock and start the equipment. This prevents accidental startup of equipment while it is in a hazardous state or while a worker is in direct contact with it. Lockout–tagout is used across industries as a safe method of working on hazardous equipment and is mandated by law in some countries.