also may not fall so as to strike protrusions or adjoining walls during the fall. The safe fall distance is a function of the fall factor and the deployment of the "energy absorbers". As a rule of thumb for a factor 2 fall, a fall distance of approx will be required. This is equivalent to 2 stories of a building. If the fall clearance is less than this the worker may strike the ground before his fall is arrested. Design of HLL systems The design of an HLL system is a complex process. The designer should always perform a design calculation and the results of this calculation should be presented in any proposal and verified as acceptable. The loads applied to the structure and the fall clearance required should be checked. See also Personal protective equipment Safety harness References External links Fall Arrest Info Sample Fall Arrest Program Safety