Federal Registers
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 1  1989 - 10/31/1989 - Excavations; Construction; Trenching; Shoring; Sloping; Benching;Final Rule - 54:45894-45991
 2  1988 - 02/23/1988 - Excavation - 53:5280-82
 3  1987 - 04/15/1987 - Excavation - 52:12288-339

Standard Interpretations
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 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.

Regulations (Standards - 29 CFR)
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 1  1926.650 - Scope, application, and definitions applicable to this subpart.