Glossary
LOTO (Lockout/Tagout)
Plain-Language Definition
A safety procedure that uses physical locks and warning tags to ensure hazardous energy sources are isolated before maintenance work begins. Each worker applies their own lock to prevent unexpected energisation.
Technical Context
LOTO applies to electrical, mechanical, hydraulic, pneumatic, thermal, and chemical energy sources. Governed by OSHA 29 CFR 1910.147 and NFPA 70E. The procedure requires identification of all energy sources, shutdown, isolation, lock application, verification of zero energy state, and controlled re-energisation.
Why It Matters
Failure to implement LOTO is one of the top causes of workplace fatalities during maintenance. Unexpected energisation kills experienced technicians. LOTO is not optional for any maintenance on energised equipment.
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