Fall Distance Clearance Calculator
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Required fall distance clearance for overhead mount systems
Fall distance clearance is the measurement which is calculated by totaling the distance that a person falls from the working surface to the position they end up in when their fall has been arrested. It also factors in a clearance distance to account for any stretch in the harness and lanyard.
Correct calculation ensures that the operator's fall arrest system will activate so they are not injured by coming into contact with any obstructions below.
RD: Required fall clearance
FF: Free fall
DD: Deceleration distance
C: Mandatory clearance
Use the calculator to determine the fall distance clearance and lanyard length that you must allow in your overhead mount installations.
The fall distance clearance required is dependent on the following factors:
Elevation of anchorage
Lanyard length
Lanyard elongation on deceleration pull out (personal energy absorber)
Operator height
Fall distance residual clearance (allowance for stretch in the lanyard and harness)
Enter your values
Calculation results
- Unobstructed free fall distance (FF)
- 1900 mm
- Deceleration distance (lanyard tear-out value) (DD)
- 600 mm
- Mandatory clearance* (C)
- 1000 mm
- Required fall distance clearance (RD)
- 3500 mm
*Australian Standards specify a minimum clearance distance of 1000mm between the nearest obstruction.
Important Note: Maximum lanyard length is considered in all calculations.
Lanyards
Exceeding this length could result in serious injury, death or may require a rescue to ensure operator safety
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A lanyard less than this measurement will not provide enough length to enable you to reach the work surface
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Important note
Failure to provide the sufficient fall clearance distance for operators could result in serious injury or death should a fall at height occur.
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