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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 11 is calculated
using the performance data of the SRD and includes all four metrics listed previously to determine the
MRFC.
5.5.2 FT-X with a Non-Overhead Anchorage Leading Edge Anchorage Application
[130 to 310 lbs. (59 to 141 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
1
condition.
Figure 10 - MRFC Overhead Anchorage
8ft Edge Core 310lb
.5
Y- Lateral
Figure 12 - FT-X Minimum Required Fall Clearance for 130 to 310 lbs. (59 to 141 kg) Users
Horizontal Distance to Anchorage
8
7
6
5
8
7
6
9ft
5
4
3
12ft
2
1
15ft
0
17ft
-
1
-
2
-
3
-
4
20ft
Z- Minimum Required
-
22ft
5
Fall Clearance From
Working Surface
2.4
1.8
2.1
1.5
Minimum Required Fall Clearance
Indicated in gure above
MINIMUM REQUIRED FALL CLEARANCE FOR
130-310 lb (59-141kg) USER
13
2
Front
X-SRD Anchorage Height
Above Dorsal D-ring
50mm
Z- Minimum Required
Fall Clearance From
Working Surface
PATENT PENDING
from Dorsal D-Ring
Feet
4
3
2
1
0
1
2
3
4
7ft / 2.1m
2.7m
1
4.6m
6.1m
2
1.2
0.6
0
0.6
1.2
0.9
0.3
0.3
0.9
Meters
412-06393 rev B
.5
Y- Lateral
28.0
Figure 11 - MRFC Non-Overhead Anchorage
5
6 7 8
2.4
2.1
increments along the
1.8
X-Axis represents the
1.5
Horizontal Distance
1.2
to Anchorage the
3.7m
0.9
user is working away
0.6
0.3
0
Example 1:
5.2m
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 2.0 ft (0.6 m) above
1.2
-
the D-Ring. Minimum required fall clearance is 12
6.7m
-
1.5
feet (3.7m) including swing fall.
1.8
2.4
1.5
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 20 feet (6.1m) including swing fall.
X-SRD Anchorage Height
Above Dorsal D-ring
3
Z- Minimum Required
Fall Clearance From
Working Surface
Figure 4 - MRFC Non-Overhead Anchorage
1 foot (0.3 m)
1 foot (0.3 m) incre-
ments up the Y-Axis
represent the Elevation
of the Anchorage from
the user's Dorsal D-Ring
from the SRD
Z- Minimum Required
Fall Clearance From
Working Surface
Z- Minimum Required
Fall Clearance From
Working Surface
4
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