#	Letters of Interpretation
1	10/21/2024 - 1910.147(d) - Lockout/Tagout (LOTO) Feasibility and "Alternative Methods"
2	10/21/2024 - 1910.147(e)(3) - Lockout/Tagout (LOTO) Feasibility and "Alternative Methods"
3	10/21/2024 - 1910.147(e)(2) - Lockout/Tagout (LOTO) Feasibility and "Alternative Methods"
4	10/21/2024 - 1910.147(f)(1) - Lockout/Tagout (LOTO) Feasibility and "Alternative Methods"
5	06/13/2003 - 1910.147 - Response to Exelon Generation's concerns regarding draft Instruction CPL 2-1.18A, "Enforcement of the Electric Power Generation, Transmission and Distribution Standard."
6	10/21/2024 - 1910.147, 1910.147(f)(1), 1910.147(e)(2), 1910.147(e)(3), 1910.147(d) - Lockout/Tagout (LOTO) Feasibility and "Alternative Methods"
7	10/15/2024 - 1910.147 - Inspection Guidance for Animal Slaughtering and Processing Establishments
8	07/27/2023 - 1910.147(f)(3) - Group Lockout/Tagout
9	09/30/2021 - 1910.147(b) - Energy Isolation Device Requirements
10	08/31/2021 - 1910.147 - Trip and Emergency Switches on Mills and Calenders
11	05/21/2021 - 1910.147(f)(3) - Group Lockout or Tagout
12	08/05/2015 - 1910.147(f) - Lockout/tagout of electrical hazards by workers who install, maintain, repair or replace premises wiring systems.
13	08/05/2015 - 1910.147(c) - Lockout/tagout of electrical hazards by workers who install, maintain, repair or replace premises wiring systems.
14	08/05/2015 - 1910.147(a) - Lockout/tagout of electrical hazards by workers who install, maintain, repair or replace premises wiring systems.
15	07/01/2015 - 1910.147(c)(7) - Lockout/tagout requirements during maintenance of front-end loaders (Jeff Wilke/DEP/GIE/Harvey/26485)
16	09/22/2014 - 1910.147 - Electronic Certification of Training
17	12/12/2012 - 1910.147(d)(3) - Whether an LED type device ca be used for the isolation and deenergization verification requirements of 1910.147 and 1910.333.
18	12/12/2012 - 1910.147(d)(2) - Whether an LED type device ca be used for the isolation and deenergization verification requirements of 1910.147 and 1910.333.
19	12/12/2012 - 1910.147(a)(1)(ii)(D) - Whether an LED type device ca be used for the isolation and deenergization verification requirements of 1910.147 and 1910.333.
20	12/12/2012 - 1910.147(a)(1)(i) - Whether an LED type device ca be used for the isolation and deenergization verification requirements of 1910.147 and 1910.333.
21	12/12/2012 - 1910.147(d)(6) - Whether an LED type device ca be used for the isolation and deenergization verification requirements of 1910.147 and 1910.333.
22	12/12/2012 - 1910.147(d)(5) - Whether an LED type device ca be used for the isolation and deenergization verification requirements of 1910.147 and 1910.333.
23	12/12/2012 - 1910.147(d)(4) - Whether an LED type device ca be used for the isolation and deenergization verification requirements of 1910.147 and 1910.333.
24	12/12/2012 - 1910.147, 1910.147(a)(1)(i), 1910.147(a)(1)(ii)(D), 1910.147(d)(2), 1910.147(d)(3), 1910.147(d)(4), 1910.147(d)(5), 1910.147(d)(6) - Whether an LED type device ca be used for the isolation and deenergization verification requirements of 1910.147 and 1910.333.
25	08/02/2012 - 1910.147 - Clarification on the use of a tagout device when an energy isolating device is capable of being locked out.
26	04/03/2012 - 1910.147 - Application of Lockout/Tagout to Employees Performing Maintenance Tasks on Cord and Plug Equipment
27	08/30/2011 - 1910.147 - Use of local valves as a means of equipment isolation for energy control.
28	08/04/2011 - 1910.147 - Numerous questions on lockout/tagout under 1910.147 and 1910.269
29	11/30/2010 - 1910.147 - Numerous questions on lockout/tagout under 1910.147 and Subpart S.
30	04/28/2010 - 1910.147(c) - OSHA Training Standards Policy Statements
31	01/25/2008 - 1910.147(b) - Use of a PLC system as an alternative measure which provides effective protection for minor servicing activities.
32	01/25/2008 - 1910.147(a)(2)(ii) - Use of a PLC system as an alternative measure which provides effective protection for minor servicing activities.
33	01/25/2008 - 1910.147, 1910.147(a)(2)(ii), 1910.147(b) - Use of a PLC system as an alternative measure which provides effective protection for minor servicing activities.
34	05/04/2007 - 1910.147(f)(1) - Lockout/Tagout and the provisions for testing or positioning of machines while they are energized.
35	05/04/2007 - 1910.147(b) - Lockout/Tagout and the provisions for testing or positioning of machines while they are energized.
36	05/04/2007 - 1910.147(a)(2)(ii) - Lockout/Tagout and the provisions for testing or positioning of machines while they are energized.
37	05/04/2007 - 1910.147, 1910.147(a)(2)(ii), 1910.147(b), 1910.147(f)(1) - Lockout/Tagout and the provisions for testing or positioning of machines while they are energized.
38	04/23/2007 - 1910.147(f)(2)(i) - Application of Control of Hazardous Energy (LOTO) requirements to compressed gas cylinders.
39	04/23/2007 - 1910.147(c)(7)(iii)(B) - Application of Control of Hazardous Energy (LOTO) requirements to compressed gas cylinders.
40	04/23/2007 - 1910.147(c)(7)(iii)(A) - Application of Control of Hazardous Energy (LOTO) requirements to compressed gas cylinders.
41	04/23/2007 - 1910.147(c)(7) - Application of Control of Hazardous Energy (LOTO) requirements to compressed gas cylinders.
42	04/23/2007 - 1910.147(b) - Application of Control of Hazardous Energy (LOTO) requirements to compressed gas cylinders.
43	04/23/2007 - 1910.147, 1910.147(b), 1910.147(c)(7), 1910.147(c)(7)(iii)(A), 1910.147(c)(7)(iii)(B), 1910.147(f)(2)(i) - Application of Control of Hazardous Energy (LOTO) requirements to compressed gas cylinders.
44	04/18/2007 - 1910.147(d)(5)(ii) - PRCS and LOTO requirements for accumulation of stored energy in steam pits
45	04/18/2007 - 1910.147, 1910.147(d)(5)(ii) - PRCS and LOTO requirements for accumulation of stored energy in steam pits
46	02/26/2007 - 1910.147(b) - Evaluation of the ElectroGuard disconnect system for use as an energy isolating device.
47	02/26/2007 - 1910.147(a)(2)(ii) - Evaluation of the ElectroGuard disconnect system for use as an energy isolating device.
48	02/26/2007 - 1910.147, 1910.147(a)(2)(ii), 1910.147(b) - Evaluation of the ElectroGuard disconnect system for use as an energy isolating device.
49	12/28/2006 - 1910.147(b) - Application of the Lockout/Tagout standard to die-setting activities and other machine setup operations.
50	12/28/2006 - 1910.147(a)(2)(iii)(A) - Application of the Lockout/Tagout standard to die-setting activities and other machine setup operations.
51	12/28/2006 - 1910.147(a)(2)(ii) - Application of the Lockout/Tagout standard to die-setting activities and other machine setup operations.
52	12/28/2006 - 1910.147, 1910.147(a)(2)(ii), 1910.147(a)(2)(iii)(A), 1910.147(b) - Application of the Lockout/Tagout standard to die-setting activities and other machine setup operations.
53	10/11/2006 - 1910.147(c)(5)(ii) - Use of LOTO device on equipment placed in "out of service" status not related to servicing or maintenance.
54	10/11/2006 - 1910.147(a)(1)(i) - Use of LOTO device on equipment placed in "out of service" status not related to servicing or maintenance.
55	10/11/2006 - 1910.147, 1910.147(a)(1)(i), 1910.147(c)(5)(ii) - Use of LOTO device on equipment placed in "out of service" status not related to servicing or maintenance.
56	08/25/2006 - 1910.147(f)(1) - Several questions regarding OSHA's LOTO and Bakery standards 29 CFR 1910.147 and 1910.263.
57	08/25/2006 - 1910.147(b) - Several questions regarding OSHA's LOTO and Bakery standards 29 CFR 1910.147 and 1910.263.
58	08/25/2006 - 1910.147(a)(2)(ii) - Several questions regarding OSHA's LOTO and Bakery standards 29 CFR 1910.147 and 1910.263.
59	08/25/2006 - 1910.147, 1910.147(a)(2)(ii), 1910.147(b), 1910.147(f)(1) - Several questions regarding OSHA's LOTO and Bakery standards 29 CFR 1910.147 and 1910.263.
60	07/28/2006 - 1910.147 - Clarification about 29 CFR 1910.333 and 29 CFR 1910.147 as they relate to work inside an electrical panel and on related equipment.
61	07/12/2006 - 1910.147(c)(4)(ii) - PSM compliance for ammonia refrigeration systems.
62	07/12/2006 - 1910.147, 1910.147(c)(4)(ii) - PSM compliance for ammonia refrigeration systems.
63	05/09/2006 - 1910.147(c)(4)(i) - Use of additional lock on a conveyor and baler system exceeds one lockout device.
64	05/09/2006 - 1910.147, 1910.147(c)(4)(i) - Use of additional lock on a conveyor and baler system exceeds one lockout device.
65	01/18/2006 - 1910.147(a)(2)(ii) - Interlock requirements for access door(s) of trash compactor.
66	01/18/2006 - 1910.147, 1910.147(a)(2)(ii) - Interlock requirements for access door(s) of trash compactor.
67	10/24/2005 - 1910.147(c)(7)(i) - Training programs for the Control of Hazardous Energy (LOTO) and for the Hazard Communication standard are not satisfied solely by merely providing employees written documentation.
68	10/24/2005 - 1910.147, 1910.147(c)(7)(i) - Training programs for the Control of Hazardous Energy (LOTO) and for the Hazard Communication standard are not satisfied solely by merely providing employees written documentation.
69	08/24/2005 - 1910.147(a)(2)(iii)(A) - Lockout/tagout requirements for servicing manually-controlled vertical/horizontal milling machine and drill press tool changes.
70	08/24/2005 - 1910.147(a)(2)(ii) - Lockout/tagout requirements for servicing manually-controlled vertical/horizontal milling machine and drill press tool changes.
71	08/24/2005 - 1910.147, 1910.147(a)(2)(ii), 1910.147(a)(2)(iii)(A) - Lockout/tagout requirements for servicing manually-controlled vertical/horizontal milling machine and drill press tool changes.
72	07/07/2005 - 1910.147 - Machine guarding and exposure to hazards from robotic laundry shuttles.
73	04/22/2005 - 1910.147(f)(1) - Lock out/Tag out (LOTO) requirements for die-setting operations in hydraulic power presses.
74	04/22/2005 - 1910.147(d) - Lock out/Tag out (LOTO) requirements for die-setting operations in hydraulic power presses.
75	04/22/2005 - 1910.147(b) - Lock out/Tag out (LOTO) requirements for die-setting operations in hydraulic power presses.
76	04/22/2005 - 1910.147(a)(2)(ii) - Lock out/Tag out (LOTO) requirements for die-setting operations in hydraulic power presses.
77	04/22/2005 - 1910.147, 1910.147(a)(2)(ii), 1910.147(b), 1910.147(d), 1910.147(f)(1) - Lock out/Tag out (LOTO) requirements for die-setting operations in hydraulic power presses.
78	11/10/2004 - 1910.147(c)(4)(ii) - Recognition of ANSI/ASSE Z244.1 "Control of Hazardous Energy - Lockout/Tagout and Alternative Methods" consensus standard
79	11/10/2004 - 1910.147, 1910.147(c)(4)(ii) - Recognition of ANSI/ASSE Z244.1 "Control of Hazardous Energy - Lockout/Tagout and Alternative Methods" consensus standard
80	04/07/2004 - 1910.147(a)(3)(ii) - Printing Industry: Lock Out/Tag Out and the essential elements of the inch-safe-service technique
81	04/07/2004 - 1910.147(a)(2)(ii) - Printing Industry: Lock Out/Tag Out and the essential elements of the inch-safe-service technique
82	04/07/2004 - 1910.147(f)(1) - Printing Industry: Lock Out/Tag Out and the essential elements of the inch-safe-service technique
83	04/07/2004 - 1910.147, 1910.147(f)(1), 1910.147(a)(2)(ii), 1910.147(a)(3)(ii) - Printing Industry: Lock Out/Tag Out and the essential elements of the inch-safe-service technique
84	02/10/2004 - 1910.147(f)(3) - Clarification of "authorized" and "affected" employees and proper energy control procedures.
85	02/10/2004 - 1910.147(f)(3)(ii) - Clarification of "authorized" and "affected" employees and proper energy control procedures.
86	02/10/2004 - 1910.147(d)(4)(i) - Clarification of "authorized" and "affected" employees and proper energy control procedures.
87	02/10/2004 - 1910.147(d) - Clarification of "authorized" and "affected" employees and proper energy control procedures.
88	02/10/2004 - 1910.147(c)(7)(i) - Clarification of "authorized" and "affected" employees and proper energy control procedures.
89	02/10/2004 - 1910.147(c)(4) - Clarification of "authorized" and "affected" employees and proper energy control procedures.
90	02/10/2004 - 1910.147(b) - Clarification of "authorized" and "affected" employees and proper energy control procedures.
91	06/13/2003 - 1910.147 - Response to Edison Electric Institute's concerns regarding draft Instruction CPL 2-1.18A, "Enforcement of the Electric Power Generation, Transmission and Distribution Standard."
92	05/13/2003 - 1910.147(c)(2)(iii) - Acceptability of modifying a standard on/off switch to provide lockout capability to a machine.
93	05/13/2003 - 1910.147(c)(3) - Acceptability of modifying a standard on/off switch to provide lockout capability to a machine.
94	05/13/2003 - 1910.147, 1910.147(c)(3), 1910.147(c)(2)(iii) - Acceptability of modifying a standard on/off switch to provide lockout capability to a machine.
95	12/02/2002 - 1910.147 - Applicability of the confined-space standard to dock-leveler pits.
96	08/30/2002 - 1910.147(c)(5)(ii)(B) - Color is not the only prescribed factor for the standardization of LOTO devices.
97	08/30/2002 - 1910.147, 1910.147(c)(5)(ii)(B) - Color is not the only prescribed factor for the standardization of LOTO devices.
98	07/08/2002 - 1910.147(c)(5) - Use of verification tags for lockout.
99	07/08/2002 - 1910.147, 1910.147(c)(5) - Use of verification tags for lockout.
100	01/29/2002 - 1910.147(d) - Authorized employees must have the opportunity to verify energy isolation in group lockout/tagout
101	01/29/2002 - 1910.147(c)(2) - Authorized employees must have the opportunity to verify energy isolation in group lockout/tagout
102	11/16/2000 - 1910.147 - Applicability of OSHA's LOTO standards; isolation and verification procedures.
103	07/10/2000 - 1910.147(e)(3) - Evaluation of proposed modifications to the Bureau of Prisons' Lockout/Tagout (LOTO) procedures.
104	07/10/2000 - 1910.147, 1910.147(e)(3) - Evaluation of proposed modifications to the Bureau of Prisons' Lockout/Tagout (LOTO) procedures.
105	03/22/2000 - 1910.147(c)(3) - Lockout/tagout: preferred means of energy isolation; non cord-and-plug powered equipment.
106	03/22/2000 - 1910.147(a)(2)(iii)(A) - Lockout/tagout: preferred means of energy isolation; non cord-and-plug powered equipment.
107	02/28/2000 - 1910.147(e)(3) - Removal of lockout devices by persons other than those who applied them.
108	12/16/1999 - 1910.147(a)(2)(ii) - Use of Monitored Power Systems for lockout/tagout.
109	12/16/1999 - 1910.147(c)(1) - Use of Monitored Power Systems for lockout/tagout.
110	12/16/1999 - 1910.147(b) - Use of Monitored Power Systems for lockout/tagout.
111	11/10/1999 - 1910.147 - LOTO of hydraulic systems; postal workers' exposure to hazardous material spills.
112	02/26/1999 - 1910.147(a)(2)(iii)(A) - OSHA enforcement policy on vertical food mixers.
113	02/26/1999 - 1910.147(a)(2)(ii)(B) - OSHA enforcement policy on vertical food mixers.
114	02/26/1999 - 1910.147(a)(2)(ii)(A) - OSHA enforcement policy on vertical food mixers.
115	02/26/1999 - 1910.147, 1910.147(a)(2)(ii)(A), 1910.147(a)(2)(ii)(B), 1910.147(a)(2)(iii)(A) - OSHA enforcement policy on vertical food mixers.
116	02/27/1997 - 1910.147 - Clarification on entitlement of a copy of energy control program documentation at meat packing plant.
117	10/29/1996 - 1910.147 - Consultants performing lockout/tagout periodic inspections.
118	10/02/1996 - 1910.147 - Food Inspectors lockout/tagout procedures.
119	09/11/1996 - 1910.147 - Voluntary safety and health audits under the Occupational Safety and Health Act
120	05/15/1996 - 1910.147 - Electrical generators in hospitals and the control of hazardous energy.
121	01/11/1996 - 1910.147(c)(4)(i) - Permit-required confined spaces and control of hazardous energy; vehicle LOTO.
122	01/11/1996 - 1910.147(a) - Permit-required confined spaces and control of hazardous energy; vehicle LOTO.
123	10/27/1995 - 1910.147 - Guidance in determining whether elevator pits meet the definition of confined spaces.
124	09/27/1995 - 1910.147 - Interpretation of the Process Safety Management of Highly Hazardous Chemicals Standard.
125	08/28/1995 - 1910.147 - The Lockout/Tagout Standard.
126	05/24/1995 - 1910.147 - Clarification concerning the Electric Power Generation, Transmission, and Distribution standard.
127	11/15/1993 - 1910.147 - Permit-Required Confined Spaces: metal container curing ovens.
128	06/14/1993 - 1910.147 - Applicability of the Machine Guarding and Lockout/Tagout standards to printing presses
129	09/16/1992 - 1910.147 - Printing Presses: requirements for normal production and servicing operations
130	08/05/1991 - 1910.147 - Motor starter circuits and energy isolation devices
131	06/04/1991 - 1910.147 - Interpretation of 1910.147, related to floating fish processors.
132	04/10/1991 - 1910.147 - Work permits in lockout/tagout standard requirements