When using a shock absorbing lanyard, it is important to understand how to calculate the potential fall distance to avoid contact with lower level. The calculation below gives the minium fall distance betwwen the anchorage point of the lanyard and the lower level.
This is calculated by allowing for:
Twice the length of the lanyard (to allow for the length of the lanyard and the height of the worker.
+1.75m deceleration distance to allow for elongation of the shock absorber and any give in the lanyard.
+1m safety margin.
TOTAL = 6.75m clearance required using a 2m lanyard.