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This material was produced under grant number 46B4-HT15 from the Occupational Safety and Health Administration, U.S. Department of Labor. It does not necessarily reflect the views or policies of the U.S. Department of Labor, nor does mention of trade names, commercial products, or organizations imply endorsement by the U.S. Government.

lock out tag out lo to 29 cfr 1910 147

LOCK OUT / TAG OUT(LO/TO)29 CFR 1910.147

"Lockout/tagout" refers to specific practices and procedures to safeguard employees from the unexpected energization or startup of machinery and equipment, or the release of hazardous energy during service or maintenance activities.

lo to
  • Most incidents occur in workplace around machinery or equipment
  • Other incidents occur from electric shock or hazardous materials
  • This can be avoided by using Lock Out/Tag Out to contain hazardous energy
lo to when to use it
For Service & Maintenance of Equipment







If worker needs to remove safety guards

When a worker needs to place any part of their body into machinery

To avoid an unexpected start-up

LO/TO When To Use It
lo to energy sources
LO/TOEnergy Sources
  • Electrical
  • Hydraulic & pneumatic
  • Potential energy from springs
  • Gravity
  • Chemical
  • Radiation
  • Pneumatic
  • Thermal
  • Mechanical (from sources other than springs)
lo to achieve zero energy status
LO/TOAchieve Zero Energy Status
  • Utilizing Lock Out/Tag Out
  • No one may start the machinery or equipment while it is being repaired or cleaned
lo to three classifications
LO/TOThree Classifications
  • Authorized Personnel: perform service and maintenance, apply locks & tags
  • Affected Personnel: operate the machinery, prepare machines and/or equipment, and work within same area when lock out/ tag out occurs
  • Other: may pass by an area where LO/TO is being used (example: an office worker)
lo to lock out devices
LO/TOLock Out Devices
  • Lock with one key and a tag
  • Chain
  • Block
  • Flange
  • Pipe blank or blind
lo to tag out devices
LO/TOTag Out Devices
  • Tags are always attached to the lock or energy isolation device
  • Serves as a communication device

and securely fastened

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  • Locks and Tags are to be used by each individual working on a machine (double check for extraneous power or stored energy), either on the hasp itself, or lockable to a box with alternate hasp
    • should only be removed by the individual, after work is complete or replaced by oncoming shift
  • Tags without locks only allowed when as safe as lock and additional protection is taken – i.e. cap over start button with fuse removed in panel
lo to six steps of lo to
LO/TOSix Steps of LO/TO
  • Preparation
  • Equipment Shutdown
  • Equipment Isolation
  • Application of LO/TO device
  • Release of stored energy
  • Verification
lo to six steps of lo to cont d
LO/TOSix Steps of LO/TO (cont’d)
  • Preparation: identify and isolate hazardous energy sources, and understand how to use equipment
  • Equipment Shutdown: stop buttons, and follow shut down procedures
  • Equipment Isolation: install device to isolate hazardous energy sources
lo to six steps of lo to cont d16
LO/TOSix Steps of LO/TO (cont’d)

4. Apply Locks & Tags: if something can be locked, it MUST be locked; if it can’t be locked it MUST be tagged

5. Release Stored Energy: guard against residual energy

6. Verification: try activating start button to ensure everything is off, check interlock, and be sure area is clear

lo to when work is complete
LO/TOWhen Work is Complete
  • Remove tools & equipment
  • Keep a safe distance
  • Remove LO/TO devices
  • Restore energy
  • Notify operators and supervisors work is complete
lo to doesn t apply when
LO/TODoesn’t Apply When…
  • Performing routine adjustments
  • Performing repetitive adjustments
  • Working on cord & plug equipment kept within sight
  • Integral with production

Always use safe work practices

lo to employee training
LO/TOEmployee Training
  • Employer must provide initial training and retraining as necessary
  • Training must be certified with employee’s name and date of training
lo to written procedures
LO/TOWritten Procedures
  • Routine lockouts require the company to maintain a written procedure for:
    • Each individual machine or piece of equipment, or
    • Each group of similar machines or equipment
  • Non-routine lockouts must have a specific written procedure for the lockout activity.
lo to written procedures21
LO/TOWritten Procedures

Procedures must have:

  • A statement of the intended use of the procedure
  • Procedural steps for the LOTO process for that type of equipment. Specific steps for testing a machine to determine if a “zero energy” state is achieved
  • Steps to release or remove the equipment from LOTO
lo to periodic inspections
LO/TOPeriodic Inspections
  • Performed at least annually to assure that the energy control procedures are effective and continue to be implemented
  • Inspection must be certified; identify machinery and equipment, record the date, and note employees included in the inspection
  • Review with all authorized users
lo to tag only situations
LO/TOTag-Only Situations
  • When machine or equipment cannot be locked out
  • Employer may choose to modify to allow 100% LO/TO
  • Full protection includes complying with all Tag Out provisions, plus implementing additional safety measures
lo to group lo to
  • Group LO/TO includes having each authorized employee place his/her lock and tag on equipment being locked out
    • See www.osha.gov/dts/osta/lototraining/tutorial/gr-loto.htmfor examples of group procedures
  • Shift or Personnel Change – specific procedures are utilized during shift changes
lo to absentee lock removal
LO/TOAbsentee Lock Removal
  • One person at the company is designated

This designated person must:

  • Make reasonable efforts to find the absentee individual
  • Ensure it is safe to remove the device
  • Absent Authorized Individual must be notified BEFORE resuming work at the facility.
lo to summary
  • LO/TO provides for control of energy sources that could cause injury during service or maintenance of machinery and equipment
  • Devices must be unique and substantial
  • Authorized Individuals are the ONLY people who can apply locks, tags and other LO/TO devices
  • Tags must identify who applied the device
  • Six steps must be followed.
  • Written procedures must be developed
  • Group lockouts and Absentee lock removal processes defined