#	Federal Register
1	10/21/2020 - 1926.652(b), 1926.652(b)(3), 1926.652(b)(4) - 85:67013-67015 - Excavations (Design of Cave-in Protection Systems); Extension of the Office of Management and Budget's (OMB) Approval of Information Collection (Paperwork) Requirements - PDF
2	11/05/2014 - 1926.652(b) - 79:65704-65705 - Agency Information Collection Activities; Submission for OMB Review; Comment Request; Excavation Cave-in Protection System Design Standard - PDF
3	07/30/2014 - 1926.652(b) - 79:44199-44201 - Excavations (Design of Cave-In Protection Systems); Extension of the Office of Management and Budget's (OMB) Approval of Information Collection (Paperwork) Requirements - PDF

#	Standard Interpretations
1	07/01/2010 - 1926.652(b), 1926.652(b)(2), 1926.652(b)(4) - Can a person who qualifies as a "competent" person under one section of support P also qualify as a competent designer of structural ramps under 1926.651(c)(1)(i)?.
2	10/13/2009 - 1926.652(b) - Protective system requirements for excavations that will not be entered by employees.
3	09/30/2004 - 1926.652(b) - Permissibility of using average excavation depth to determine protective system requirements for the excavation.
4	12/22/2003 - 1926.652(b), 1926.652(b)(3), 1926.652(b)(4) - Registered professional engineer approval requirements for combination trench shield and sloping system trenches with a depth greater than 20 feet.
5	01/16/2003 - 1926.652(b) - Registered professional engineer approval requirements for manufactured trench protection systems deeper than 20 feet.
6	10/17/2000 - 1926.652(b) - Requirements to prevent trench collapse during sheet-pile operations.
7	08/10/2000 - 1926.652(b) - Trench shield must extend 18" above excavation walls when below grade.

#	Regulations
1	05/07/2004 - - Requirements for protective systems.