Falltech 7009 Manuel De L'utilisateur page 18

Figure 4 - Minimum Clear Fall Requirement: ANSI Class B Self Retracting Lanyard
Activation/Deceleration Distance
4 1/2 ft
A Maximum allowable length of cable or web that may payout from the SRD once
(1.4 m)
deceleration of the user has begun and after a fall event occurs
Harness Stretch and Dorsal D-Ring Shift
1 1/2 ft
B Combined amount of harness webbing elongation and dorsal D-ring up-shift during entire
(0.5 m)
fall event
Height of Dorsal D-Ring
5 ft
C Typical average height of the dorsal D-ring on a user's full body harness measured from
(1.5 m)
the walking/working surface up
Safety Factor
1 1/2 ft
D Added length to account for other factors such as an improperly adjusted harness, actual
(0.5 m)
worker height or worker weight
12 1/2 ft
E Total Minimum Clear Fall Distance Required
(3.9 m)
1. Overhead Anchorage 2. Walking/Working Surface 3. Nearest Lower Level or Obstruction
MFBH04 Rev A
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