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Privacy and Security Notice
ES&H Manual
Chapter 6110 Lock, Tag, Try (LTT) Program
Lock, Tag, and Try (LTT) is the approved method for securing hazardous energy sources in order to provide personal protection while performing maintenance and service work. Refer to Environmental, Safety, and Health (ES&H) Manual Chapter 6111 Administrative Control Using Locks and Tags for administrative control applications.

This program satisfies the requirements of OSHA 29 CFR1910.147 The Control of Hazardous Energy (Lockout/Tagout); the standard used when servicing and maintaining equipment/systems.

Jefferson Lab's construction subcontractors follow OSHA 29 CFR1926 Safety and Health Regulations for Construction; which is the standard for construction work activities. Subcontracting Officer's Technical Representatives (SOTRs) are tasked with reviewing subcontractors programs for compliance.

LTT is required whenever there is the potential for someone to be injured by the unexpected start-up of equipment or by a release of stored energy during maintenance and service work. Some typical situations are when:
  • Making repairs or performing routine maintenance to equipment that someone else might remotely activate.
  • Clearing a jammed mechanism.
  • Removing or bypassing a guard or other safety device.
  • Placing any part of your body where it could be caught by moving machinery.
  • Placing any part of your body within the limited approach boundary of an exposed or un-insulated electrical circuit.
  • Working on high-pressure systems or on piping which contains hazardous materials.

Table 1: Required LTT Training by Job Classification

Training Course Qualified Tagger LTT SOTR

LTT Training
(Required every three years)


Technical Appendices:

T1 Lock, Tag, Try (LTT) Procedure
ES&H Manual Chapter 6110 Appendix T1 Lock, Tag, Try (LTT) Procedure contains the guidelines for locking and tagging out of hazardous energy sources when maintenance or service work is to be performed. LTT references in this appendix apply to maintenance, service, and construction applications. Refer to ES&H Manual Chapter 6111 Administrative Control Using Locks and Tags for administrative configuration control applications.

Configuration management requirements for equipment specific LTT procedures include:
  • Document numbers
  • Owner identification
  • Revision number, if applicable
  • Date of efficacy
  • Expiration/review date
  • Approval record
  • Change record
  • Archival of previous versions

Lock, Tag, Try (LTT) Multiple Energy Form: Click for Word Document

T2 Special Lock and Tag Removal Procedure
In accordance with Jefferson Lab procedures (ES&H Manual Chapter 6110 Appendix T1 Lock, Tag, Try (LTT) Procedure and ES&H Manual Chapter 6111 Administrative Control Using Locks and Tags) a lock and/or tag is removed only by the Qualified Tagger who placed it on the equipment, or an authorized person in the administrative control scenario. If the Qualified Tagger is unavailable, or the information is missing or illegible, ES&H Manual Chapter 6110 Appendix T2 Special Lock and Tag Removal Procedure is utilized.

Special Lock and Tag Removal Form: Click for Word Document

T3 Group Lock, Tag, Try (LTT) Procedure
ES&H Manual Chapter 6110 Appendix T3 Group Lock, Tag, Try (LTT) Procedure provides members of a group a way to secure hazardous energy sources with protection equivalent to that provided by the individual procedure outlined in ES&H Manual Chapter 6110 Appendix T1 Lock, Tag, Try (LTT) Procedure.

Group Lock, Tag, Try (LTT) Form: Click for Word Document


Note: Management authority may be delegated to a task qualified Jefferson Lab employee at the discretion of the responsible manager.

Anyone at Jefferson Lab
  • Recognize and respect LTT measures.
  • Do not remove any lock or tag except those meeting the criteria outlined within ES&H Manual Chapter 6110 Appendix T2 Special Lock and Tag Removal Procedure.
Qualified Tagger
  • Maintain appropriate LTT training (SAF 104 Lock, Tag, Try).
  • Obtain specific LTT training on equipment being serviced.
  • Perform LTT process steps (in accordance with ES&H Manual Chapter 6110 Lock, Tag, Try (LTT) Procedure) only after authorization from the supervisor of the equipment which requires the securing of the hazardous energy source.
  • Only assign Qualified Taggers, and provide equipment-specific LTT training, for equipment under your authority.
  • Maintain familiarity with Jefferson Lab's LTT programs and procedures, when supervising employee(s) who use LTT procedures.
  • Perform inspections for compliance with lock and tag procedures as part of regular supervisory oversight.
Subcontracting Officer's Technical Representative (SOTR)
  • Maintain LTT qualifications when supervising subcontractors who perform LTT on site.
  • Review and approve or provide equipment-specific LTT procedure(s) to subcontractors as needed.
  • Implement group LTT and act as Group LTT Coordinator in accordance with ES&H Manual Chapter 6110 Appendix T3 Group Lock, Tag and Try Procedure, if Jefferson Lab employee(s) and subcontractor(s) under your authority are concurrently working on the same equipment/system.
  • If the subcontractor elects to use the Jefferson Lab program, ensure they perform the following:
    • Complete and maintain appropriate LTT training (SAF 104 Lock, Tag, Try) and equipment specific training;
    • Participate, if requested, in OSHA required annual JSA LTT review;
    • Undertake corrective actions, including retraining of staff and subsequent demonstration of proficiency, if JSA or subcontractor observations indicate unsafe or non-compliant performance.
  • If subcontractors elect to use their own Lockout/Tagout program, review their program and approve if:
Group LTT Coordinator
  • Ensure all energy sources are under LTT.
  • Account for all persons working on the job/task.
  • Ensure all steps of the group LTT procedure are properly carried out.
Safety Warden
  • Assess effectiveness of the functional locks and tags observed during routine safety inspections.
Electrical Safety Engineer
  • Conduct annual review of the application of LTT procedures as outlined in OSHA 1910.147.
  • Conduct inspections to ensure LTT procedures and requirements are being followed.
  • Provide LTT training and qualification requirements.

NOTE: Questions concerning outsiders' actions and knowledge of LTT procedures should be made to the Electrical Safety Engineer. See also ES&H Manual Chapter 3410 ES&H Aspects of Procurements

Document Control:
    APPROVAL DATE:   3/24/20
    REVIEW DATE:  3/24/23
    Revision 1.8 - 03/24/20 - Updated training requirement course in Table 1 per CATS#STR-2019-14-01-02
    Revision 1.7 - 11/12/19 - Updated section 4.1 per CATS#NE-2019-05-02-01 to add required configuration management controls for equipment specific LTT procedures; updated SOTR responsibilities to clarify subcontractor’s use of Jefferson Lab’s program or their own program for Lockout/Tagout procedures; updated TPOC from T.Kujawa to T.Fitzgerald.
    Revision 1.6 - 09/25/18 - Updated Supervisor and SOTR responsibilities to clarify LTT training for subcontractors per CATS# INSP-2018-002-01-02.
    Periodic Review - 03/09/18 - No changes per TPOC.
    Revision 1.5 - 03/09/15 - Periodic Review; no substantive changes.
    Revision 1.4 - 05/20/14 - Added Required Safety Training Table.
    Revision 1.3 - 11/07/13 - "3.8 ES&H Training Committee" (committee has been disbanded) per MLogue.
    Revision 1.2 - 02/18/13 - Clarification of process steps per TKujawa.
    Revision 1.1 - 12/01/11 - Clarification of process steps and updates made to format. Qualifying periodic review, no substantive changes required.
    Revision 1.0 - 11/02/09 - Update to reflect current laboratory operations.

This document is controlled as an on-line file. It may be printed but the print copy is not a controlled document. It is the user's responsibility to ensure that the document is the same revision as the current on line file. .