Will I Hit That? Clearance Calculations
- These methods are conservative estimates (the term “estimating clearance” is preferred rather than “calculating clearance”). If calculations are to be accurate within inches, more in depth calculations are required to determine specific energy absorber deployment distances.
- Estimate clearances in three steps:
- Determine the starting point (anchor or platform height);
- Determine how far the equipment will let you travel from the starting point;
- Subtract the two to determine how close to the ground you are.
Knowing how the equipment performs is necessary to estimate clearances because the free fall (C) and energy absorber deployment(D) changes with self-retracting devices, lifelines, and different types of lanyards. Once you understand the different methods (shown in the poster), you can apply the same principles to whichever equipment is being used and have an idea whether the system will prevent you from contacting a lower level or obstruction.
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