Calculating Free-Fall Distances: HIGHER = BETTER!!!
Self Retracting Devices Personal fall arrest systems used with this equipment must be rigged to limit the free fall to a maximum of 6’ per ANSI Z359.1-2007. OSHA also requires free falls to be limited to 6’ or less & not to contact lower levels. The same factors for fall clearance must be taken into consideration for Self-Retracting Devices as those for Energy Absorbing Lanyards:
Fall Clearance: There must be sufficient clearance below the user to arrest a fall before the user strikes the ground or other obstruction. The clearance required is dependent on the following factors:
• Elevation of anchorage • Connecting subsystem length • Arrest distance • Free fall distance • Worker height • Movement of harness attachment element
Arrest Distance
Safety Factor
Walking/Working Surface
CALCULATE THE MINIMUM REQUIRED FALL CLEARANCE FOR OVERHEAD SRL'S! 1) Determine the Arrest Distance (AD) for the type of device being used: Class A Device = 24" • Class B Device = 54" 2) Add the Safety Factor (SF): Class A Device = 24" • Class B Device = 24" 3) Calculate the Minimum Required Clearance (MRC) AD + SF = MRC: Class A Device = 48" (4 feet) • Class B Device = 78" (6.5 feet) AD + SF = MRC
Lower Level Obstruction
Always Remember: HIGHER = BETTER
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