Falltech 727630LE User Instruction Manual page 24

Figure 3A: Calculating Minimum Required Fall Clearance SRL-LE
Anchorage: 5' Minimum Setback from Leading Edge and 5' below Dorsal D-ring
A 6½ ft
SRD Deceleration Distance (Worst Case Value, See Table 1B for Exact Model)
Dorsal D-Ring Shift and FBH Stretch
B
1 ft Combined amount of Dorsal D-ring up-shift and harness webbing elongation
during a fall event
Dorsal D-Ring Height
5 ft
C
Height of the Dorsal D-Ring from the walking surface
Safety Factor - Added length to account for other factors such as an improperly
1½ ft
D
adjusted harness, actual worker height or worker weight
Sub Total- Minimum Required Fall Clearance for Below D-ring Anchorage
E
14 ft
of SRD with No Swing Fall (sum of A thru D only)
*Additional Fall Clearance Calculation
F
due to Swing Fall (using Chart 1)
Total Required Fall Clearance
G
Including sub-total E and Swing Fall F (from Chart 1)
* If a potential Swing Fall Hazard condition is also present, additional Fall Clearance is needed in the above
calculation; see Chart 1 for calculating this additional required distance
APPENDIX A
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