349.1. Anchorage system: An anchorage system
(1) cannot be used by more than 1 person at a time, except in the case of a continuous anchorage system, such as a horizontal lifeline, or a rigid anchorage system, such as a rail;
(2) must be designed so that the D-ring of the suspension point of a worker’s safety harness cannot be moved horizontally by more than 3 m or an angle of 22°; and
(3) must be designed so that properly attached personal protective equipment cannot be detached involuntarily.
The structure on which the anchorage system is installed must be able to withstand the effort exerted by the anchorage system in addition to the other efforts that it must ordinarily withstand.