29 CFR 1926 – OSHA Construction. Subpart K – Electrical. Data is current as of September 1, 2020. For future updates please install our OSHA Construction App: Table of Contents: General. §1926. 400 - duction. Installation Safety Requirements. §1926. 402 - Applicability. §1926. 403 - General requirements. §1926. 404 - Wiring design and protection.