Standard Interpretations
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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.
- 1926.800 - Applicablity of Subpart S to tunnels contructed by auger boring. - 10/01/2010
- 1926.800 - Cage, skip and load connections to hoist ropes. - 08/19/1992
- 1926.800 - Construction standards for equipment such as Shuttle Buggy. - 05/23/2001
- 1926.800 - Cut and cover construction. - 09/23/1980
- 1926.800 - Cut and cover tunneling operations. - 04/30/1975
- 1926.800 - Cut-and-cover operation regulations of Excavation, Trenching, and Shoring. - 07/19/1976
- 1926.800 - Definition of Potentially Gassy Atmosphere. - 07/24/1993
- 1926.800 - Fire prevention and protection requirements applicable to underground construction. - 03/15/1996
- 1926.800 - Numerous clarifications regarding underground construction;variances; joint ventures. - 05/28/1998
- 1926.800 - Rehabilitation of a sewer tunnel constructed in the years between 1926 and 1932 - 01/29/1991
- 1926.800 - Safety aspects of personnel and material hoists. - 02/17/1978
- 1926.800 - The handling, Storing and Use of MAPP Gas in Underground Construction Work. - 04/15/1976
- 1926.800 - Transportation of compressed gas chambers - 05/05/1992
- 1926.800 - Typographical error in internet text of 1926.800(r)(13)(ii). - 11/29/2002
- 1926.800 - Use of liquefied petroleum gas (LPG) underground. - 05/20/1992
- 1926.800 - Wedge Sockets Wire Rope Clips (Piggy-Back Clip). - 08/08/1994
- 1926.800 - Wire rope clips in conjunction with wedge sockets. - 07/26/1994
- 1926.800(a) - Application of 1926.800 to lone employees working underground in a tunnel or shaft connected to a tunnel. - 05/03/2001
- 1926.800(a)(1) - Applicablity of Subpart S to tunnels contructed by auger boring. - 10/01/2010
- 1926.800(c) - Application of 1926.800 to lone employees working underground in a tunnel or shaft connected to a tunnel. - 05/03/2001
- 1926.800(c) - Use of Mapp gas, oxygen, and acetylene in a tunnel. - 04/19/1976
- 1926.800(e) - Application of 1926.800 to lone employees working underground in a tunnel or shaft connected to a tunnel. - 05/03/2001
- 1926.800(f)(1) - Application of 1926.800 to lone employees working underground in a tunnel or shaft connected to a tunnel. - 05/03/2001
- 1926.800(f)(5) - Application of 1926.800 to lone employees working underground in a tunnel or shaft connected to a tunnel. - 05/03/2001
- 1926.800(g)(2) - Application of 1926.800 to lone employees working underground in a tunnel or shaft connected to a tunnel. - 05/03/2001
- 1926.800(g)(4) - Tunnel illumination requirements. - 03/13/2000
- 1926.800(g)(5) - A rescue team is required during all phases of underground construction operations in a tunnel. - 03/06/1991
- 1926.800(h)(2)(iii) - Interpretation on testing requirements for grouted tunnel rock bolts - 03/21/1980
- 1926.800(k)(10)(i) - Cut-and-cover operation in the construction of tunnels. - 01/31/1978
- 1926.800(k)(2) - Supplied air and ventilating air requirements. - 11/11/1975
- 1926.800(l)(2) - Tunnel illumination requirements. - 03/13/2000
- 1926.800(m)(5) - Use of gasoline in underground construction. - 01/10/1997
- 1926.800(r)(13)(ii) - Typographical error in internet text of 1926.800(r)(13)(ii). - 11/29/2002
- 1926.800(s) - Tunnel boring machine equipment. - 12/09/1993
- 1926.800(s)(1) - Protection of flexible cords when hung in tunnel shafts. - 07/08/1991
- 1926.800(s)(3) - Oil-filled transformers and underground construction. - 07/16/2008
- 1926.800(t)(1)(vii) - Regarding the type of hook that is permitted when a crane is used to hoist personnel during underground construction work - 11/27/2013