Horizontal Lifelines
Horizontal Lifelines (HLL) are cables or ropes stretched horizontally between two or more anchor points, letting the worker move along one path while staying connected to the protection system. Types: temporary HLL for defined projects, permanent HLL with engineering design, and multi-span HLL with intermediate anchor points.
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About this category
Horizontal lifelines solve the challenge of long travel along a single path without hopping between multiple anchors. The basic design: a steel cable or webbing stretched between two end anchors at a pretension set by the manufacturer's instructions. The worker clips a carabiner that glides on the cable and moves freely along the path. Types: temporary HLLs install for short projects and permanent HLLs serve recurring maintenance; both need an approved design or selection that verifies anchor loads, clearance and number of users, and the design defines anchor spacing, cable tension, sag distance under fall, and the allowed worker count. An important technical note: flexible HLLs differ from rigid rail systems; the cable sags under a fall, which increases total fall distance, so total fall clearance must be calculated carefully. Allowed worker count is specified exactly (typically 1-4 by design). Applications: long construction sites, refinery maintenance platforms, wide plant roofs, and installation work at assembly stations. A substantive difference from single anchors: HLLs allow continuous movement without unclipping, while single anchors need separate connections at each location. Specifications follow ANSI Z359.6 and EN 795 Type C.
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Horizontal lifelines solve the challenge of long travel along a single path without hopping between multiple anchors. The basic design: a steel cable or webbing stretched between two end anchors at a pretension set by the manufacturer's instructions. The worker clips a carabiner that glides on the cable and moves freely along the path. Types: temporary HLLs install for short projects and permanent HLLs serve recurring maintenance; both need an approved design or selection that verifies anchor loads, clearance and number of users, and the design defines anchor spacing, cable tension, sag distance under fall, and the allowed worker count. An important technical note: flexible HLLs differ from rigid rail systems; the cable sags under a fall, which increases total fall distance, so total fall clearance must be calculated carefully. Allowed worker count is specified exactly (typically 1-4 by design). Applications: long construction sites, refinery maintenance platforms, wide plant roofs, and installation work at assembly stations. A substantive difference from single anchors: HLLs allow continuous movement without unclipping, while single anchors need separate connections at each location. Specifications follow ANSI Z359.6 and EN 795 Type C.
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