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What is Free Fall Clearance?
Free fall clearance is the safety distance below the user that a fall arrest system requires to brake and stop a fall before the user strikes the ground or any obstacles below. Information about the required clearance is provided in the product’s user manual and is specified either from the anchorage point or from the user’s foot level. Note that if the anchorage point deflects (elongation) or bends downward under load, increasing the total braking distance, this must be added to the free fall clearance.
Example: If a person weighing 100 kg falls freely for 1 meter, approximately 1000 kg of energy is generated. The maximum energy that the human body can be subjected to in a free fall is 600 kg. The fall arrest system will therefore absorb everything above 600 kg through a deceleration distance. If the person were to fall freely for 2 meters, approximately 2000 kg of energy would be generated, and absorbing 1400 kg would require an even longer deceleration distance.