Lockout tagout

Data records

• Lockout/tagout is the placement of a lock, a tag or both on an energy-isolating device under a documented procedure so that the circuit cannot be re-energized until each device is removed by the person who installed it; it is the control-of-energy step in establishing an electrically safe work condition. Source: Electrical Testing Reference editorial taxonomy, 2026-10 edition. Verified 2026-10-27. Record gloss.lockout-tagout.definition
• Clauses 120.3 and 120.4 of NFPA 70E-2027 set the principles and the equipment: every exposed person takes part, locks and tags go only on circuit disconnecting means, control devices are never the primary isolating device, each device is unique, identifiable and used for no other purpose, a lockout device includes a lock that identifies its installer, and a tagout device carries a statement prohibiting operation on a non-reusable, self-locking attachment. Source: NFPA 70E-2027, clause 120.3. Verified 2026-10-27. Record gloss.lockout-tagout.nfpa70e.principles-and-devices
• Clause 120.2 of NFPA 70E-2027 requires each employer to establish, document and implement a lockout/tagout program whose procedures safeguard workers from electrical hazards and apply to fixed, temporarily installed and portable equipment; the employer supplies the devices, trains the workers under clause 110.4(B) and audits the program and its execution under clause 110.3(L), with Informative Annex G as a sample program. Source: NFPA 70E-2027, clause 120.2. Verified 2026-10-27. Record gloss.lockout-tagout.nfpa70e.program
• Clause 120.5(A) of NFPA 70E-2027 recognizes two forms: a simple lockout/tagout, in which qualified persons de-energize one set of conductors or one source solely to safeguard employees and each worker is responsible for their own devices, and a complex lockout/tagout, used where there are multiple sources, crews, crafts, locations, employers or disconnecting means, a particular sequence, or a job spanning more than one work period, which requires a written plan of execution naming the person in charge and a group lockout mechanism. Source: NFPA 70E-2027, clause 120.5(A). Verified 2026-10-27. Record gloss.lockout-tagout.nfpa70e.simple-and-complex