29 CFR 1926 – OSHA Construction. Subpart P - Excavations. Data is current as of September 1, 2020. For future updates please install our OSHA Construction App: Table of Contents: §1926. 650 - Scope, application, and definitions applicable to this subpart. §1926. 651 - Specific excavation requirements. §1926. 652 - Requirements for protective systems.