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5.5.3 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 Figure 13.
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 15 is calculated
using the performance data of the SRD and includes all four metrics listed previously to determine the
MRFC.
5.5.4 FT-X with a Non-Overhead Anchorage Leading Edge Anchorage Application
[310 to 420 lbs. (141 to 191 kg) user]
The 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.
1
Figure 13 - MRFC Overhead Anchorage
8ft Edge Core 420lb
.5
Y- Lateral
28.0
Figure 15 - FT-X Minimum Required Fall Clearance for 310 to 420 lbs. (141 to 191 kg) Users
PATENT PENDING
Horizontal Distance to Anchorage
8
7
6
5
4
8
7
6
5
11ft
4
3
2
14ft
1
1
0
-
1
18ft
-
2
-
3
21ft
-
24ft
4
Z- Minimum Required
-
Fall Clearance From
26ft
2
5
Working Surface
2.4
1.8
1.2
2.1
1.5
0.9
Minimum Required Fall Clearance
Indicated in gure above
MINIMUM REQUIRED FALL CLEARANCE FOR
310-420 lb (141-191kg) USER
14
2
Front
X-SRD Anchorage Height
Above Dorsal D-ring
50mm
Z- Minimum Required
Fall Clearance From
Working Surface
from Dorsal D-Ring
Feet
3
2
1
0
1
2
3
4
5
6 7 8
8ft/ 2.4m
3.4m
4.3m
5.5m
6.4m
7.3m
7.9m
0.6
0
0.6
1.2
1.8
0.3
0.3
0.9
1.5
Meters
.5
28.0
3
Figure 14 - MRFC Non-Overhead Anchorage
2.4
increments along the
2.1
X-Axis represents the
1.8
Horizontal Distance
1.5
1.2
user is working away
0.9
0.6
0.3
0
Example 1:
-
0.3
If the user is working 3 feet (0.9 m) away from
-
0.6
the SRD, and the SRD is anchored between the
-
0.9
user's Dorsal D-Ring or up to 1.0 ft (0.3 m) above
1.2
-
the D-Ring. Minimum required fall clearance is 14
-
1.5
feet (4.3 m) including swing fall.
2.4
2.1
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.
X-SRD Anchorage Height
Y- Lateral
Z- Minimum Required
Fall Clearance From
Working Surface
Figure 4 - MRFC Non-Overhead Anchorage
1 foot (0.3 m)
increments up the Y-Axis
represent the Elevation
to Anchorage the
of the Anchorage from
the user's Dorsal D-Ring
from the SRD
Z- Minimum Required
Fall Clearance From
Working Surface
Above Dorsal D-ring
Z- Minimum Required
Fall Clearance From
Working Surface
4
Back
1 foot (0.3 m)
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