Standard Interpretations
OSHA requirements are set by statute, standards, and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. Each letter constitutes OSHA's interpretation of the requirements discussed. Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information.
- 1910.147 - Acceptability of modifying a standard on/off switch to provide lockout capability to a machine. - 05/13/2003
- 1910.147 - Applicability of OSHA's LOTO standards; isolation and verification procedures. - 11/16/2000
- 1910.147 - Applicability of the confined-space standard to dock-leveler pits. - 12/02/2002
- 1910.147 - Applicability of the Machine Guarding and Lockout/Tagout standards to printing presses - 06/14/1993
- 1910.147 - Application of Control of Hazardous Energy (LOTO) requirements to compressed gas cylinders. - 04/23/2007
- 1910.147 - Clarification concerning the Electric Power Generation, Transmission, and Distribution standard. - 05/24/1995
- 1910.147 - Color is not the only prescribed factor for the standardization of LOTO devices. - 08/30/2002
- 1910.147 - Consultants performing lockout/tagout periodic inspections. - 10/29/1996
- 1910.147 - Electrical generators in hospitals and the control of hazardous energy. - 05/15/1996
- 1910.147 - Electronic Certification of Training - 09/22/2014
- 1910.147 - Evaluation of proposed modifications to the Bureau of Prisons' Lockout/Tagout (LOTO) procedures. - 07/10/2000
- 1910.147 - Evaluation of the ElectroGuard disconnect system for use as an energy isolating device. - 02/26/2007
- 1910.147 - Food Inspectors lockout/tagout procedures. - 10/02/1996
- 1910.147 - Guidance in determining whether elevator pits meet the definition of confined spaces. - 10/27/1995
- 1910.147 - Interlock requirements for access door(s) of trash compactor. - 01/18/2006
- 1910.147 - Interpretation of 1910.147, related to floating fish processors. - 06/04/1991
- 1910.147 - Interpretation of the Process Safety Management of Highly Hazardous Chemicals Standard. - 09/27/1995
- 1910.147 - Lock out/Tag out (LOTO) requirements for die-setting operations in hydraulic power presses. - 04/22/2005
- 1910.147 - LOTO of hydraulic systems; postal workers' exposure to hazardous material spills. - 11/10/1999
- 1910.147 - Machine guarding and exposure to hazards from robotic laundry shuttles. - 07/07/2005
- 1910.147 - Motor starter circuits and energy isolation devices - 08/05/1991
- 1910.147 - Numerous questions on lockout/tagout under 1910.147 and 1910.269 - 08/04/2011
- 1910.147 - Numerous questions on lockout/tagout under 1910.147 and Subpart S. - 11/30/2010
- 1910.147 - OSHA enforcement policy on vertical food mixers. - 02/26/1999
- 1910.147 - Permit-Required Confined Spaces: metal container curing ovens. - 11/15/1993
- 1910.147 - PRCS and LOTO requirements for accumulation of stored energy in steam pits - 04/18/2007
- 1910.147 - Printing Presses: requirements for normal production and servicing operations - 09/16/1992
- 1910.147 - PSM compliance for ammonia refrigeration systems. - 07/12/2006
- 1910.147 - Several questions regarding OSHA's LOTO and Bakery standards 29 CFR 1910.147 and 1910.263. - 08/25/2006
- 1910.147 - The Lockout/Tagout Standard. - 08/28/1995
- 1910.147 - Trip and Emergency Switches on Mills and Calenders - 08/31/2021
- 1910.147 - Use of additional lock on a conveyor and baler system exceeds one lockout device. - 05/09/2006
- 1910.147 - Use of local valves as a means of equipment isolation for energy control. - 08/30/2011
- 1910.147 - Use of verification tags for lockout. - 07/08/2002
- 1910.147 - Voluntary safety and health audits under the Occupational Safety and Health Act - 09/11/1996
- 1910.147 - Work permits in lockout/tagout standard requirements - 04/10/1991
- 1910.147(a) - Permit-required confined spaces and control of hazardous energy; vehicle LOTO. - 01/11/1996
- 1910.147(a)(1)(i) - Use of LOTO device on equipment placed in "out of service" status not related to servicing or maintenance. - 10/11/2006
- 1910.147(a)(2)(ii) - Application of the Lockout/Tagout standard to die-setting activities and other machine setup operations. - 12/28/2006
- 1910.147(a)(2)(ii) - Evaluation of the ElectroGuard disconnect system for use as an energy isolating device. - 02/26/2007
- 1910.147(a)(2)(ii) - Interlock requirements for access door(s) of trash compactor. - 01/18/2006
- 1910.147(a)(2)(ii) - Lock out/Tag out (LOTO) requirements for die-setting operations in hydraulic power presses. - 04/22/2005
- 1910.147(a)(2)(ii) - Lockout/Tagout and the provisions for testing or positioning of machines while they are energized. - 05/04/2007
- 1910.147(a)(2)(ii) - Lockout/tagout requirements for servicing manually-controlled vertical/horizontal milling machine and drill press tool changes. - 08/24/2005
- 1910.147(a)(2)(ii) - Printing Industry: Lock Out/Tag Out and the essential elements of the inch-safe-service technique - 04/07/2004
- 1910.147(a)(2)(ii) - Several questions regarding OSHA's LOTO and Bakery standards 29 CFR 1910.147 and 1910.263. - 08/25/2006
- 1910.147(a)(2)(ii) - Use of a PLC system as an alternative measure which provides effective protection for minor servicing activities. - 01/25/2008
- 1910.147(a)(2)(ii) - Use of Monitored Power Systems for lockout/tagout. - 12/16/1999
- 1910.147(a)(2)(ii)(A) - OSHA enforcement policy on vertical food mixers. - 02/26/1999
- 1910.147(a)(2)(ii)(B) - OSHA enforcement policy on vertical food mixers. - 02/26/1999
- 1910.147(a)(2)(iii)(A) - Application of the Lockout/Tagout standard to die-setting activities and other machine setup operations. - 12/28/2006
- 1910.147(a)(2)(iii)(A) - Lockout/tagout requirements for servicing manually-controlled vertical/horizontal milling machine and drill press tool changes. - 08/24/2005
- 1910.147(a)(2)(iii)(A) - Lockout/tagout: preferred means of energy isolation; non cord-and-plug powered equipment. - 03/22/2000
- 1910.147(a)(2)(iii)(A) - OSHA enforcement policy on vertical food mixers. - 02/26/1999
- 1910.147(a)(3)(ii) - Printing Industry: Lock Out/Tag Out and the essential elements of the inch-safe-service technique - 04/07/2004
- 1910.147(b) - Application of Control of Hazardous Energy (LOTO) requirements to compressed gas cylinders. - 04/23/2007
- 1910.147(b) - Application of the Lockout/Tagout standard to die-setting activities and other machine setup operations. - 12/28/2006
- 1910.147(b) - Clarification of "authorized" and "affected" employees and proper energy control procedures. - 02/10/2004
- 1910.147(b) - Energy Isolation Device Requirements - 09/30/2021
- 1910.147(b) - Evaluation of the ElectroGuard disconnect system for use as an energy isolating device. - 02/26/2007
- 1910.147(b) - Lock out/Tag out (LOTO) requirements for die-setting operations in hydraulic power presses. - 04/22/2005
- 1910.147(b) - Lockout/Tagout and the provisions for testing or positioning of machines while they are energized. - 05/04/2007
- 1910.147(b) - Several questions regarding OSHA's LOTO and Bakery standards 29 CFR 1910.147 and 1910.263. - 08/25/2006
- 1910.147(b) - Use of Monitored Power Systems for lockout/tagout. - 12/16/1999
- 1910.147(c) - OSHA Training Standards Policy Statements - 04/28/2010
- 1910.147(c)(1) - Use of Monitored Power Systems for lockout/tagout. - 12/16/1999
- 1910.147(c)(2) - Authorized employees must have the opportunity to verify energy isolation in group lockout/tagout - 01/29/2002
- 1910.147(c)(2)(iii) - Acceptability of modifying a standard on/off switch to provide lockout capability to a machine. - 05/13/2003
- 1910.147(c)(3) - Acceptability of modifying a standard on/off switch to provide lockout capability to a machine. - 05/13/2003
- 1910.147(c)(3) - Lockout/tagout: preferred means of energy isolation; non cord-and-plug powered equipment. - 03/22/2000
- 1910.147(c)(4) - Clarification of "authorized" and "affected" employees and proper energy control procedures. - 02/10/2004
- 1910.147(c)(4)(i) - Permit-required confined spaces and control of hazardous energy; vehicle LOTO. - 01/11/1996
- 1910.147(c)(4)(i) - Use of additional lock on a conveyor and baler system exceeds one lockout device. - 05/09/2006
- 1910.147(c)(4)(ii) - PSM compliance for ammonia refrigeration systems. - 07/12/2006
- 1910.147(c)(4)(ii) - Recognition of ANSI/ASSE Z244.1 "Control of Hazardous Energy - Lockout/Tagout and Alternative Methods" consensus standard - 11/10/2004
- 1910.147(c)(5) - Use of verification tags for lockout. - 07/08/2002
- 1910.147(c)(5)(ii) - Use of LOTO device on equipment placed in "out of service" status not related to servicing or maintenance. - 10/11/2006
- 1910.147(c)(5)(ii)(B) - Color is not the only prescribed factor for the standardization of LOTO devices. - 08/30/2002
- 1910.147(c)(7) - Application of Control of Hazardous Energy (LOTO) requirements to compressed gas cylinders. - 04/23/2007
- 1910.147(c)(7) - Lockout/tagout requirements during maintenance of front-end loaders (Jeff Wilke/DEP/GIE/Harvey/26485) - 07/01/2015
- 1910.147(c)(7)(i) - Clarification of "authorized" and "affected" employees and proper energy control procedures. - 02/10/2004
- 1910.147(c)(7)(iii)(A) - Application of Control of Hazardous Energy (LOTO) requirements to compressed gas cylinders. - 04/23/2007
- 1910.147(c)(7)(iii)(B) - Application of Control of Hazardous Energy (LOTO) requirements to compressed gas cylinders. - 04/23/2007
- 1910.147(d) - Authorized employees must have the opportunity to verify energy isolation in group lockout/tagout - 01/29/2002
- 1910.147(d) - Clarification of "authorized" and "affected" employees and proper energy control procedures. - 02/10/2004
- 1910.147(d) - Lock out/Tag out (LOTO) requirements for die-setting operations in hydraulic power presses. - 04/22/2005
- 1910.147(d)(4)(i) - Clarification of "authorized" and "affected" employees and proper energy control procedures. - 02/10/2004
- 1910.147(d)(5)(ii) - PRCS and LOTO requirements for accumulation of stored energy in steam pits - 04/18/2007
- 1910.147(e)(3) - Evaluation of proposed modifications to the Bureau of Prisons' Lockout/Tagout (LOTO) procedures. - 07/10/2000
- 1910.147(e)(3) - Removal of lockout devices by persons other than those who applied them. - 02/28/2000
- 1910.147(f)(1) - Lock out/Tag out (LOTO) requirements for die-setting operations in hydraulic power presses. - 04/22/2005
- 1910.147(f)(1) - Lockout/Tagout and the provisions for testing or positioning of machines while they are energized. - 05/04/2007
- 1910.147(f)(1) - Printing Industry: Lock Out/Tag Out and the essential elements of the inch-safe-service technique - 04/07/2004
- 1910.147(f)(1) - Several questions regarding OSHA's LOTO and Bakery standards 29 CFR 1910.147 and 1910.263. - 08/25/2006
- 1910.147(f)(2)(i) - Application of Control of Hazardous Energy (LOTO) requirements to compressed gas cylinders. - 04/23/2007
- 1910.147(f)(3) - Clarification of "authorized" and "affected" employees and proper energy control procedures. - 02/10/2004
- 1910.147(f)(3) - Group Lockout or Tagout - 05/21/2021
- 1910.147(f)(3) - Group Lockout/Tagout - 07/27/2023
- 1910.147(f)(3)(ii) - Clarification of "authorized" and "affected" employees and proper energy control procedures. - 02/10/2004