Fall Arrest Lanyards

Energy Absorption: Why 6kN Matters

Energy-absorbing lanyards deploy shock absorbers during a fall—either through controlled tearing of webbing or extension of a shock pack. The goal? Limit braking force to below 6kN, the safety threshold set by BS EN 355:2002. Above that, you risk catastrophic internal injuries even when properly harnessed. Without energy absorption, arrest forces can exceed 15kN.

Shock absorbers are tested with a 100kg torso dummy. Total arrest distance must be less than twice the energy absorber length plus 1.75m. Anchorage points need minimum 12kN resistance. Fixed lengths typically range from 1m to 2m; adjustable designs give you positioning flexibility without swapping lanyards mid-shift.

Fall Arrest vs. Work Restraint: The Critical Distinction

Here's what many buyers get wrong: fall arrest lanyards (EN 355) stop falls that occur; work restraint lanyards (EN 358) prevent falls by limiting your working radius. Restraint systems have no energy absorber and must be short enough to physically block access to unprotected edges when correctly anchored. The calculation is critical—measure your working radius, factor in anchor position, and ensure the lanyard length prevents edge access entirely.

You cannot interchange them. Using an energy-absorbing lanyard as restraint adds unnecessary bulk and may allow edge access due to longer length. Using a restraint lanyard for fall arrest? Catastrophic—no shock absorption means full impact force hits your body and the anchor.

Single Leg, Double Leg, and Connector Selection

Single leg lanyards suit static work with secure overhead anchorage. Double leg lanyards enable continuous protection during movement between anchor points—one leg remains connected while you reposition the second, eliminating unprotected moments. Essential for scaffolding, steelwork, and any task requiring lateral movement at height.

Connector types: • Large scaff hooks fit tube scaffolding quickly and suit frequent repositioning • Karabiners work for eyebolts, structural steel, and varied anchorage • Twist-lock or triple-action connectors prevent accidental opening under load

Match connector size and gate opening to your anchorage. Oversized hooks on small anchor points create leverage risks; undersized connectors won't fit structural beams.