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Back to Personal Fall Arrest Systems Printing Instructions Horizontal Lifelines Horizontal lifelines are to be designed, installed, and used under the supervision of a qualified person, and as part of a complete personal fall arrest system which maintains a safety factor of at least two. On suspended scaffolds or similar working platforms with horizontal lifelines that may become vertical lifelines, the devices used to connect to a horizontal lifeline must be capable of locking in both directions on the lifeline. 29 CFR 1926 Subpart L, Scaffolds. OSHA Standard 1926.451, General requirements 1926.451(g)(3)(ii) 1926.451(g)(3)(iii) 29 CFR 1926 Subpart M, Fall protection. OSHA Standard. 1926.502, Fall protection systems criteria and practices 1926.502(d)(7) 1926.502(d)(8)

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