Fall-arrest system anchors must be capable of supporting a static load of 5,000 lbs. for each worker connected to an anchorage point, unless engineering certification exists. Anchorage points that have engineering certification must still maintain a safety factor of at least 2:1 when the system is designed, installed and used under the supervision of a qualified person. Fall-arrest systems must limit a fall to 6 ft., according to ANSI A10.14-1991, OSHA 1926.502.