Standard Interpretations referencing 1926.650


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#	Title
1	2004 - 09/30/2004 - Permissibility of using average excavation depth to determine protective system requirements for the excavation.
2	2003 - 01/16/2003 - Registered professional engineer approval requirements for manufactured trench protection systems deeper than 20 feet.
3	2001 - 09/21/2001 - Clarification of utility "owner" as used in the Safety and Health Standards for Excavations, Underground Installations.
4	2000 - 08/10/2000 - Trench shield must extend 18" above excavation walls when below grade.
5	1992 - 05/11/1992 - Hazards associated with drilled foundation activities.
6	1991 - 10/29/1991 - Stacking trench boxes in trenches.
7	1991 - 10/01/1991 - Classification and subsequent designs may be used if they have been approved by a registered professional engineer.
8	1991 - 10/01/1991 - Manufacturer's Tabulated Data in the design and application of trench safety systems.
9	1991 - 06/05/1991 - Testing of type C soil is not necessary if employees are adequately protected.
10	1986 - 02/21/1986 - Clarification of Competent and Qualified Person, as it Relates to Subpart P.