Falltech 7009 Manuel De L'utilisateur page 16

Figure 2 - Minimum Clear Fall Requirement: 12 ft Energy Absorbing Lanyard
6 ft Length of Energy Absorbing Lanyard
A
(1.8 m) Original working length before a fall event occurs/before activation of energy absorber
Elongation/Deceleration Distance
5 ft
B
Maximum allowable amount of elongation that may payout from the energy absorber
(1.5 m)
upon activation during a fall event
Harness Stretch and Dorsal D-Ring Shift
1 1/2 ft
C Combined amount of harness webbing elongation and dorsal back D-ring up-shift during
(0.5 m)
entire fall event
Height of Dorsal D-ring
5 ft
D Typical average height of the dorsal D-Ring on a user's
(1.5 m)
full body harness measured from the walking/working surface up
Safety Factor
1 1/2 ft
E Added length to account for other factors such as an improperly adjusted harness, actual
(0.5 m)
worker height or worker weight
19 ft
F Total Minimum Clear Fall Distance Required
(5.8 m)
1. Walking/Working Surface
MFBH04 Rev A
Measured from Foot Level Anchorage Connector
2. Nearest Lower Level or Obstruction
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