What the standard requires
29 CFR 1910.147 — the Control of Hazardous Energy standard — protects employees who service or maintain machines and equipment from the unexpected release of stored energy. Unexpected energization is one of the deadliest hazards in manufacturing: OSHA estimates the standard prevents 120 fatalities and 50,000 injuries every year.
LOTO isn't just electrical. It covers all forms of hazardous energy — electrical, mechanical, hydraulic, pneumatic, chemical, thermal, and gravitational. Whenever an employee's body enters a danger zone that a machine could crush, cut, pinch, burn, shock, or drop material onto, LOTO applies.
When LOTO applies (and when it doesn't)
LOTO covers servicing and maintenance: constructing, installing, setting up, adjusting, inspecting, modifying, and maintaining and servicing machines or equipment. This includes lubrication, cleaning or unjamming, and making adjustments or tool changes where an employee could be exposed to unexpected energization.
LOTO does not apply to normal production operations — unless the operator must remove or bypass a guard or place any part of their body into a danger zone. Minor tool changes and adjustments during normal production are exempt only if performed with alternative measures providing effective protection.
The energy control program
1. Written energy control procedures
A written, machine-specific procedure is required for each machine or piece of equipment covered by the standard. The procedure must include:
- Specific statement of intended use of the procedure.
- Specific procedural steps for shutting down, isolating, blocking, and securing.
- Specific procedural steps for placement, removal, and transfer of lockout/tagout devices.
- Specific requirements for testing to verify effectiveness of energy control.
A single generic procedure for all equipment is a citation. Group by machine type only when the type and magnitude of energy, the shutdown procedure, and the isolation points are truly identical.
2. Lockout/tagout devices
Locks and tags must be singularly identified to the employee applying them, durable enough for the environment, standardized in color/shape/size, substantial enough to prevent removal without excessive force, and identify the employee applying them. Locks are strongly preferred over tags alone; when tags-only is used, additional safety measures are required.
3. Employee training
OSHA recognizes three employee categories:
- Authorized employees — those who lock/tag out equipment to perform servicing. Full training on the program, procedures, hazards, and methods.
- Affected employees — those whose work involves operating the equipment being locked out. Training on the purpose and use of the procedures.
- Other employees — those in areas where LOTO is used but who don't interact with the equipment. Training on the prohibition against attempting to restart or reenergize.
Retraining is required whenever there's a change in job assignment, equipment, processes, or the energy control procedure — and whenever deviations or inadequacies are observed.
4. Periodic inspections
An annual periodic inspection of each energy control procedure is required. The inspection must be conducted by an authorized employee who is not currently using the procedure, must include a review with each authorized employee of their responsibilities, and must be certified in writing (procedure name, date, inspector, employees involved).
Six-step application
- Preparation for shutdown — identify energy sources and controls.
- Machine shutdown — orderly shutdown per procedure.
- Machine isolation — operate energy-isolating devices.
- Lockout/tagout device application — each authorized employee applies their own device.
- Stored energy release — dissipate or restrain residual/stored energy.
- Verification — test controls, try to operate the equipment (return controls to neutral).
Common citations
- 1910.147(c)(4)(i) — no written energy control procedures.
- 1910.147(c)(7)(i) — inadequate employee training.
- 1910.147(c)(6)(i) — periodic inspection not performed.
- 1910.147(c)(1) — no energy control program.
- 1910.147(d)(4)(i) — devices not affixed at each energy-isolating point.
Documentation checklist
- Written energy control program (site-wide policy).
- Machine-specific energy control procedures for each covered piece of equipment.
- Annual periodic inspection certification records.
- Employee training records (authorized, affected, other), with dates and content.
- Retraining records tied to changes in equipment, processes, or procedures.
- Contractor coordination procedures for shared LOTO.
Common mistakes we see
- One generic procedure for the whole plant. Machine-specific is not optional.
- Missing the verification step. Attempting to start the equipment (with controls returned to safe/neutral) is required, not optional.
- Skipping the annual periodic inspection. Even if procedures haven't changed, the inspection must be performed and certified.
- Only training authorized employees. Affected and other employees also require training.
- Shared locks or master locks left on equipment. Every authorized employee applies their own device; group lockout requires specific procedures.
How CSPC helps
Our Baseline Blueprint engagement includes LOTO program review, machine-specific procedure development, and training-record audit. For long-term support, our Compliance Compass program conducts annual periodic inspections and keeps procedures current as equipment changes.