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Underground Construction
National Summary

OSHA's Underground Construction Standard applies to the construction of underground tunnels, shafts, chambers, and passageways. It also applies to cut-and cover excavations connected to ongoing underground construction as well as those that create conditions characteristic of underground construction. These hazards include reduced natural ventilation and light, difficult and limited access and egress, exposure to air contaminants, fire, flooding, and explosion. The regulation does not apply to excavation and trenching operations for aboveground structures that are not physically connected to an underground construction operation or to underground electrical transmission and distribution lines.

Applies to News & White Papers
Interpretations Fire prevention and protection requirements applicable to underground construction. 03/15/1996National
Directives 08/03/1992 - CPL 2.34 CH-8 - Change to the Construction Standard Alleged Violation Elements (SAVEs) Manual 07/22/2003National
Directives 08/03/1992 - CPL 2.34 CH-8 - Change to the Construction Standard Alleged Violation Elements (SAVEs) Manual 07/22/2003National
Interpretations 1926.800 - Wedge Sockets Wire Rope Clips (Piggy-Back Clip). 08/08/1994National
Interpretations 1926.800 - Wire rope clips in conjunction with wedge sockets. 07/26/1994National
Regulations 29 CFR § 1926.800 Underground construction  National
Regulations 29 CFR § 1926.801 Caissons  National
Regulations 29 CFR § 1926.802 Cofferdams  National
Regulations 29 CFR § 1926.803 Compressed air  National
Regulations 29 CFR § 1926.804 Definitions applicable to this subpart  National
Final Rules 29 CFR 1926 - Cranes and Derricks in Construction: Underground Construction and Demolition 04/23/2013National
Interpretations Application of 1926.800 to lone employees working underground in a tunnel or shaft connected to a tunnel.[1926.800; 1926.800(c); 1926.800(f)(5); 1926.800(a); 1926.800(g)(2); 1910.134; 1926.103; 1926.800(e); 1926.800(f)(1)] 05/03/2001National
Interpretations Numerous clarifications regarding underground construction; variances; joint ventures. 05/28/1998National
Interpretations Tunnel/Underground construction requirements: use of flexible bag lines for ventilation; location of main ventilation fan; and reversible ventilation.[1926] 02/25/2003National
Guidance Documents Underground Construction (Tunneling)  National
Interpretations Use of gasoline in underground construction. 01/10/1997National
Interpretations Use of liquefied petroleum gas (LPG) underground.(1926.800) 05/20/1992National
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