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To help understand how to calculate the fall space clearance required, here is an example using a six-foot tall worker with a six-foot shock absorbing lanyard, anchored to a rope-grabbing device, which is attached to a D-ring that is five feet above the working surface. If the worker falls six feet, he will be one foot below the platform, and the rope grabbing device will activate and fully lock after about two feet of sliding. If the lanyard releases its maximum amount of length plus an additional 1.5 feet of stretch in the lifeline, the fall distance will equal about 13 feet or 8 feet from the platform.