# Federal Register
1 - 1926.652(c) - 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
2 - 1926.652(c), 1926.652(c)(2)(iii), 1926.652(c)(3), 1926.652(c)(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
3 - 1926.652(c) - 79:65704-65705 - Agency Information Collection Activities; Submission for OMB Review; Comment Request; Excavation Cave-in Protection System Design Standard - PDF
4 - 1926.652(c) - 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
# Letters of Interpretation
1 - 1926.652(c) - Protective system requirements for excavations that will not be entered by employees.
2 - 1926.652(c) - Permissibility of using average excavation depth to determine protective system requirements for the excavation.
3 - 1926.652(c)(4) - Registered professional engineer approval requirements for manufactured trench protection systems deeper than 20 feet.
4 - 1926.652(c)(3) - Registered professional engineer approval requirements for manufactured trench protection systems deeper than 20 feet.
5 - 1926.652(c)(2) - Registered professional engineer approval requirements for manufactured trench protection systems deeper than 20 feet.
6 - 1926.652(c)(1) - Registered professional engineer approval requirements for manufactured trench protection systems deeper than 20 feet.
7 - 1926.652(c), 1926.652(c)(1), 1926.652(c)(2), 1926.652(c)(3), 1926.652(c)(4) - Registered professional engineer approval requirements for manufactured trench protection systems deeper than 20 feet.
8 - 1926.652(c) - Excavations may be shored with wooden shoring.
# Regulations
1 - - Requirements for protective systems.