(energy absorbing) lanyard. Once all of the components of the particular lifeline system meet the requirements of the standard, the anchor connection is then referred to as an anchorage, and the system as well as the rope is then called a "lifeline". Anchors used for lifeline anchorages are designed for force per connecting user, and the standard permits an anchor to deform in order to absorb energy (adhesive anchors have higher design requirements because of aging loss). The rope can be lifeline rope, which stretches to lengthen the fall distance as it absorbs energy; or static rope, which does not stretch and thus limits the fall distance, but requires the fall energy be absorbed in other devices. It is essential that the PPE be rated for Fall Arrest and PPE used with static line include an energy absorber. While the energy absorbing lanyards hold in excess of when fully absorbed, most limit the load during the fall to under . Another common system is an HLL (Horizontal Life Line). These are linear anchoring devices, which allow workers to move along the whole length of the anchor, usually without needing to disconnect and fixing points of the anchorage. It is normally essential to include energy (or shock) absorbers within HLL in addition to those within the workers' PPE. Without such absorbers, the horizontal life line cannot deform significantly when arresting the fall. Because of the geometry of pulling across the horizontal line, this in turn results in large resolved forces being generated within the anchor system, sufficient to cause failure of the anchorage. This can occur even with energy absorbers being included in the PPE of the worker. The load and horizontal line geometry in horizontal lifelines usually creates falls in excess of the limit of the standard, limiting HLL design to standard-defined "qualified persons". (The recognition of these basic weaknesses have resulted in most temporary "wrapped structure" HLL anchors, which were anchors made from a wire rope wrapped around a structure and its ends fastened together by wire rope clips, being replaced by fixed-point anchors or HLL systems designed by defined "qualified" persons.) Fall clearance In arresting a fall in a controlled manner, the distance required to arrest the fall must be considered. Federal OSHA limits the fall distance to unless the specific system is designed by a "qualified person" meeting the requirements of OSHA 29CFR1910.66 appendix c. The user