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Figure 9 - MRFC Overhead Anchorage
1
.5
Y- Lateral
9ft Edge Core 310lb
Figure 11 - FT-X Minimum Required Fall Clearance for 130 to 310 lbs. (59 to 141 kg) Users
Horizontal Distance to Anchorage
9
8
7
6
9
8
7
6
5
4
12ft
3
2
1
0
Z- Minimum Required
1
Fall Clearance From
19ft
2
Working Surface
3
4
24ft
5
2.4
1.8
2.7
2.1
Minimum Required Fall Clearance
Indicated in gure above
MINIMUM REQUIRED FALL CLEARANCE FOR
130-310 lb (59-141kg) USER
5.4.3 FT-X in Overhead, Non-Leading Edge Anchorage Application
[310 to 420 lbs. (141 to 11 kg) user]
The FT-X 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 Figures 9.
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 14 is calculated
using the performance data of the SRD and includes all four metrics listed previously to determine the
MRFC.
PANTONE 152C
13
2
X-SRD Anchorage Height
Above Dorsal D-ring
Front
50mm
Z- Minimum Required
Fall Clearance From
Working Surface
PATENT PENDING
from Dorsal D-Ring
Feet
5
4
3
2
1
0
1
2
3
7ft / 2.1m
9ft
1
15ft
4.6m
2
1.2
0.6
0
0.6
1.2
1.5
0.9
0.3
0.3
0.9
Meters
412-06513 rev A
Figure 10 - MRFC Non-Overhead Anchorage
4
5
6 7 8
9
2.7
2.4
2.1
2.7m
1.8
1.5
1.2
3.7m
0.9
0.6
0.3
0
0.3
5.8m
0.6
0.9
1.2
7.3m
1.5
1.8
2.4
1.5
2.1
2.7
3
Z- Minimum Required
Fall Clearance From
Working Surface
Figure 4 - MRFC Non-Overhead Anchorage
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 2.0 ft (0.6 m) above the
D-Ring. Minimum required fall clearance is 9 feet
(2.7m) including swing fall.
Example 2:
If the user needs to work 4 feet (1.2 m) away from
the SRD along the edge, and the SRD is anchored
at foot level, the minimum required fall clearance
is 24 feet (7.3 m) including swing fall.
PANTONE 0821C
Back
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
4
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