Falltech Arc Flash Mini Pro Class 1 SRL-P Manuel De L'utilisateur page 11

5.5 Calculating Minimum Required Fall Clearance
5.5.1 Arc Flash Mini Pro in Overhead, Non-Leading Edge Anchorage Application
[130 to 310 lbs. (59 to 141 kg) user]
The Arc Flash Mini Pro may be used may be used as a standard SRD in an overhead condition, in which
the SRD is installed anywhere in the allowable attachment area, which ranges from directly above the
user to level with the FBH D-ring, as shown in Figure 5.
The overhead condition minimum required fall clearance (MRFC) is calculated using four metrics,
measured from the walking-working surface: SRD Deceleration Distance, D-Ring Shift and Harness
Stretch [1 ft (0.3m)], Safety Factor [1.5 ft (0.5m)], and Swing Fall. The diagram in Figure 6 is calculated
using the performance data of the SRD and includes all four metrics listed previously to determine the
MRFC.
5.5.2 Arc Flash Mini Pro with a Non-Overhead, Non-Leading Edge Anchorage Application [130 to
310 lbs. (59 to 141 kg) user]
The non-leading edge below D-ring condition minimum required fall clearance (MRFC) is calculated
using five metrics, measured from the walking-working surface: SRD Deceleration Distance, D-Ring
Shift and Harness Stretch [1 ft (0.3m)], Safety Factor [1.5 ft (0.5m)], Dorsal D-ring Height [5 ft (1.5m)],
and Swing Fall. Dorsal D-ring height is added to account for the below D-ring tie-off compared to the
overhead condition. The diagram in Figure 6 is calculated using the performance data of the SRD and
includes all five metrics listed previously to determine the MRFC. Below D-ring tie-off is outside the
scope of ANSI Z359 and is only allowed when no edge hazards are present. At no point during a fall
shall the lifeline be loaded over any edge.
Figure 6 - Arc Flash Mini Pro Minimum Required Fall Clearance for 130 to 310 lbs. (59 to 141 kg) Users
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Figure 5 - MRFC Overhead Anchorage
.5
Y- Lateral
28.0
1
Z- Minimum Required
Fall Clearance From
Working Surface
X-SRD Anchorage Height
Above Dorsal D-ring
Z- Minimum Required
Fall Clearance From
Working Surface
1 foot (0.3 m)
increments along the
X-Axis represents the
Horizontal Distance
to Anchorage the
user is working away
from the SRD
Example 1:
If the user is working 3 feet (0.9 m) away from
the SRD, and the SRD is anchored between the
user's Dorsal D-Ring or up to 3 ft (0.9 m) above
the D-Ring. Minimum required fall clearance is
10 feet (3.0 m) including swing fall.
Example 2:
If the user needs to work 4 feet (1.2 m) away from
the SRD and the SRD is anchored at foot level
with no edge exposure, the minimum required
fall clearance is 20 feet (6.1 m) including swing
fall.
Figure 4 - MRFC Non-Overhead A
1 foot (0.3 m) incre-
ments up the Y-Axis
represent the Elevation
of the Anchorage from
the user's Dorsal D-Ring
Z- Minimum Required
Fall Clearance From
Working Surface