ES&H Manual



6110 Lock, Tag, Try (LTT) Program



1.0             Purpose

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.

2.0             Scope

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.

·         Removing or bypassing a guard or other safety device.

·         Placing any part of your body where it could be caught by moving machinery.

·         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 Training

(required every 3 years)




3.0             Responsibilities

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

3.1              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.

3.2              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.

3.3              Supervisor

·         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.

3.4              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:

o   Complete and maintain appropriate LTT training (SAF 104 Lock, Tag, Try) and equipment specific training.

o   Participate, if requested, in OSHA required annual JSA LTT review.

o   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:   

o   The subcontractors’ program meets or exceeds the requirements of OSHA 29 CFR 1926 Construction Industry Regulations when performing construction type work activities.

o   The subcontractors’ program meets or exceeds the requirements of OSHA 29 CFR 1910 General Industry Regulations when doing service or maintenance on machines or equipment.


3.5              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.


3.6              Safety Warden

·         Assess effectiveness of the functional locks and tags observed during routine safety inspections.


3.7              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.

4.0             Technical Appendices


4.1              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:

o   Document numbers

o   Owner identification

o   Revision number, if applicable

o   Date of efficacy

o   Expiration/review date

o   Approval record

o   Change record

o   Archival of previous versions


4.2              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.


4.3              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.


5.0             Revision Summary


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 – Removed Section 3.8 ESH&Q Training Committee; disbanded per M.Logue. 

Revision 1.2 – 02/18/13 – Clarification of process steps per T.Kujawa 

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







ESH&Q Division

Tim Fitzgerald




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.  This copy was printed on 3/24/2020.