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.
- 1926.652 - Clarification of house foundation/basement excavation;Fall protection requirements. - 02/01/1996
- 1926.652 - Clarification of Standards - 01/09/1991
- 1926.652 - Design of protective systems for employees working in trenches. - 05/21/1992
- 1926.652 - Design of Protective Systems in Trenches. - 05/21/1992
- 1926.652 - Excavation standards relating to aluminum rail. - 05/05/1992
- 1926.652 - Permissibility of installing a trench shield so that the top is flush with the surface. - 11/14/2003
- 1926.652 - Plywood as a substitute for meeting the standard. - 02/19/1993
- 1926.652 - Protective system requirements for excavations that will not be entered by employees. - 10/13/2009
- 1926.652 - Safety Procedures During Gunite and Shotcrete Pool Construction. - 03/28/1994
- 1926.652 - Standards addressing excavations - 12/02/1991
- 1926.652 - Suspension of 29 CFR 1926.652 to House Foundation/Basement Excavations. - 06/30/1995
- 1926.652 - Testing of type C soil is not necessary if employees are adequately protected. - 06/05/1991
- 1926.652 - Use of plywood for shoring and support systems in trenches and excavations. - 04/15/1992
- 1926.652(a) - Minimum length that an excavation must be before a protective system is required. - 07/16/1993
- 1926.652(a)(1) - Excavations may be shored with wooden shoring. - 10/15/1999
- 1926.652(a)(1) - Permissibility of using average excavation depth to determine protective system requirements for the excavation. - 09/30/2004
- 1926.652(a)(1) - Protective system requirements for excavations that will not be entered by employees. - 10/13/2009
- 1926.652(a)(1)(ii) - Permissibility of using average excavation depth to determine protective system requirements for the excavation. - 09/30/2004
- 1926.652(b) - Protective system requirements for excavations that will not be entered by employees. - 10/13/2009
- 1926.652(b) - Requirements to prevent trench collapse during sheet-pile operations. - 10/17/2000
- 1926.652(b) - Trench shield must extend 18" above excavation walls when below grade. - 08/10/2000
- 1926.652(b)(1)(i) - Classification of soils for providing protective systems in excavations. - 03/10/1992
- 1926.652(b)(4) - Regulations governing sloping and benching systems for excavations. - 05/02/2013
- 1926.652(c) - Excavations may be shored with wooden shoring. - 10/15/1999
- 1926.652(c) - Protective system requirements for excavations that will not be entered by employees. - 10/13/2009
- 1926.652(c)(1) - Registered professional engineer approval requirements for manufactured trench protection systems deeper than 20 feet. - 01/16/2003
- 1926.652(c)(2) - Registered professional engineer approval requirements for manufactured trench protection systems deeper than 20 feet. - 01/16/2003
- 1926.652(c)(3) - Registered professional engineer approval requirements for manufactured trench protection systems deeper than 20 feet. - 01/16/2003
- 1926.652(c)(4) - Registered professional engineer approval requirements for manufactured trench protection systems deeper than 20 feet. - 01/16/2003
- 1926.652(g)(1)(ii) - Allowable gap requirement between the trench shield and trench sides. - 03/11/2013
- 1926.652(g)(1)(ii) - Permissibility of installing a trench shield so that the top is flush with the surface. - 11/14/2003
- 1926.652(g)(1)(ii) - Trench shields must be installed to prevent lateral movement in a collapse. - 10/20/1999
- 1926.652(g)(1)(iv) - Design and use of trench boxes - 11/07/1991