![]() ![]() Horizontal lifelines are not tight in their initial design and can stretch in the event of a fall. However, when the anchor is part of a horizontal lifeline, the calculation is more complex. A fixed anchor is easy to calculate as the only distance to add is the ring. Still, the length of the harness and the anchorage connectors must be added. Length of the lanyard, the harness and the anchorage connectorįor an untrained worker, a lanyard of six feet may seem enough when working at a height of 10 or 12 feet. Also, the angle created by the offset must not be over 22 degrees.įour Factors to Be Taken into Consideration When Calculating the Fall Arrest Distance 1. For that reason, anchors (on the roof) must not be spaced more than 3 meters (10 feet) in between on a right angle from the building’s facade, and applied along the traction axis corresponding to the worker’s potential fall. The risk of swing fall increases in direct relation with the horizontal distance between the user’s harness and his anchorage connection point. Specific anchorage points should be located directly above the user – “above” in order to reduce the fall distance and “directly” to minimize the pendular movements. In case of a fall, this will reduce the impact force, the risks of contact with an obstacle and the injury severity while facilitating emergency and rescue operations. ![]() In order to achieve this, the user must, whenever possible, attach his lanyard to an anchorage connection point just above his shoulders. It is important to minimize the free fall distance (maximum of 1.8 meter according to the CSTC). The free fall is the distance travelled during a fall before the fall arrest system is triggered. The greater the free fall distance, the more energy the fall will produce and the more violent will be the shock. A fall arrest system (personal protective equipment for working at heights) is essentially composed of three integral elements: a body harness, a fall-arrest device (lifeline, shock absorber, carabiner, connector, cable, etc.) and an anchorage system. ![]()
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