Accidents due to falls from height are one of the main causes of death in workplaces. Fall arrest systems (FAS) are designed to arrest the fall safely without injuring the accident victim. Their main mission is to restrain the body so as to prevent it from hitting the ground, generating forces and accelerations in the arrest process that are not harmful. A lack of empirical evidence and scant technical information provided by manufacturers regarding minimum clearance distance (MCD) below anchorage makes it necessary to study the safety distances required in the use of Energy Absorber Lanyards (EAL). This paper aims to determine the MCD below anchorage to arrest a fall using an EAL without hitting the ground. The real deformation of EAL when stopping a fall is studied. Ten EAL models distributed internationally by six manufacturers were chosen. Dynamic behavior tests were performed on the samples. Using image processing the total elongation of the equipment (elastic plus plastic) is obtained. The main conclusions are that maximum plastic elongation could be reduced by 29%. The method described in EN 355: 2002 underestimates elongation by up to 70% for some equipment 20% of EAL’s exceed the maximum arrest force (Fm) allowed in EN 355. The MCD data provided by manufacturers is not reliable. The data provided by manufacturers are incomplete. It is recommended that quality control for EAL’s be strengthened to ensure that products launched onto the market meet the requirement of EN355. The findings of this study recommended increasing MCD distance longer than that calculated according to EN355, at less than 1 m.
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机译：由于高度跌落的事故是工作场所死亡的主要原因之一。秋季逮捕系统（FAS）旨在安全地逮捕跌倒而不会损害事故受害者。他们的主要任务是抑制身体，以防止它在逮捕过程中击中地面，产生力量和加速度。制造商提供的缺乏关于锚地的最小间隙距离（MCD）提供的经验证据和微量技术信息使得有必要研究使用能量吸收器挂绳（EAL）所需的安全距离。本文旨在确定锚地下方的MCD，在不击中地面的情况下使用EAL捕获跌倒。研究了在停止跌倒时的真实变形。选择了六家制造商分布的十大模型。对样品进行动态行为测试。使用图像处理设备的总伸长率（弹性加塑料）。主要结论是最大塑料伸长率可降低29％。 EN 355：2002中描述的方法低至70％的伸长率为70％的EAL超过EN 355中允许的最大逮捕力（FM）。制造商提供的MCD数据不可靠。制造商提供的数据不完整。建议加强对EAL的质量控制，以确保在市场上推出的产品符合EN355的要求。本研究的结果建议增加MCD距离，而不是根据EN355计算的，小于1米。
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