#	Letters of Interpretation
1	11/24/2025 - 1910.147(c)(5)(ii) - Clarification Regarding the Requirements of 29 CFR 1910.147
2	08/05/2015 - 1910.147(c) - Lockout/tagout of electrical hazards by workers who install, maintain, repair or replace premises wiring systems.
3	07/01/2015 - 1910.147(c)(7) - Lockout/tagout requirements during maintenance of front-end loaders (Jeff Wilke/DEP/GIE/Harvey/26485)
4	04/28/2010 - 1910.147(c) - OSHA Training Standards Policy Statements
5	04/23/2007 - 1910.147(c)(7)(iii)(B) - Application of Control of Hazardous Energy (LOTO) requirements to compressed gas cylinders.
6	04/23/2007 - 1910.147(c)(7)(iii)(A) - Application of Control of Hazardous Energy (LOTO) requirements to compressed gas cylinders.
7	04/23/2007 - 1910.147(c)(7) - Application of Control of Hazardous Energy (LOTO) requirements to compressed gas cylinders.
8	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.
9	07/12/2006 - 1910.147(c)(4)(ii) - PSM compliance for ammonia refrigeration systems.
10	05/09/2006 - 1910.147(c)(4)(i) - Use of additional lock on a conveyor and baler system exceeds one lockout device.
11	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.
12	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
13	02/10/2004 - 1910.147(c)(7)(i) - Clarification of "authorized" and "affected" employees and proper energy control procedures.
14	02/10/2004 - 1910.147(c)(4) - Clarification of "authorized" and "affected" employees and proper energy control procedures.
15	05/13/2003 - 1910.147(c)(2)(iii) - Acceptability of modifying a standard on/off switch to provide lockout capability to a machine.
16	05/13/2003 - 1910.147(c)(3) - Acceptability of modifying a standard on/off switch to provide lockout capability to a machine.
17	08/30/2002 - 1910.147(c)(5)(ii)(B) - Color is not the only prescribed factor for the standardization of LOTO devices.
18	07/08/2002 - 1910.147(c)(5) - Use of verification tags for lockout.
19	01/29/2002 - 1910.147(c)(2) - Authorized employees must have the opportunity to verify energy isolation in group lockout/tagout
20	03/22/2000 - 1910.147(c)(3) - Lockout/tagout: preferred means of energy isolation; non cord-and-plug powered equipment.
21	12/16/1999 - 1910.147(c)(1) - Use of Monitored Power Systems for lockout/tagout.
22	01/11/1996 - 1910.147(c)(4)(i) - Permit-required confined spaces and control of hazardous energy; vehicle LOTO.