Copyright Safewaze 2022
Page 9
FREE FALL (FF) + DECELERATION DISTANCE (DD) + SAFETY FACTOR (SF) = FALL CLEARANCE (FC)
Fall Clearance Calculation for Northstar Classic LE SRLs:
• Figure 5 Illustrates a typical Leading Edge Hazard with key distances represented by the Letters A, B, and C. The Letter A represents the
Setback Distance of the anchor point to which the Leading Edge SRL is attached. Letter B represents the distance along the Leading Edge
where the user could be performing work operations. Finally, Letter C represents the Fall Clearance distance required based upon
the values of Letters A and B.
• Table 5 provides Fall Clearance distances required when using a Northstar Classic LE SRL. To determine your Fall Clearance
requirements, find the value for your Setback Distance for Letter A on the left side of the chart. Determine your distance
along the edge where work operations will be performed and select the appropriate value (B) at the top of the chart. The point where
these two values intersect within the chart, is the required Leading Edge fall clearance distance.
FIGURE 5 - LEADING EDGE FALL CLEARANCE
TABLE 5 - LEADING EDGE FALL CLEARANCES
(Maximum Free Fall - 5 ft.)
Northstar Classic LE Performance Specifications
ANSI 130 lb.-310 lb. (59 kg-140 kg)
Maximum Arresting Force
1,350 lbf (6.0 kN)
Average Arresting Force
900 lbf (4.0 kN)
Claimed Maximum Arresting Distance
47 in (1.2 m)
Minimum Fall Clearance Required
14.5 ft. (4.41 m)
Maximum Free Fall
5 ft. (1.5 m)
Minimum Setback Distance
3 ft. (0 m)
TABLE 6 - MINIMUM FALL CLEARANCE
(LEADING EDGE MODELS FS9020, FS9030 & FS9050 / LEADING EDGE USE)
WORKER 130 LB TO 310 LB
5 ft
(0.61 m)
16.5 ft
(5.03 m)
16.9 ft
(5.15 m)
18.6 ft
(5.67 m)
**********
**********
**********
10 ft
(1.52 m)
16.5 ft
(5.03 m)
16.7 ft
(5.09 m)
17.7 ft
(5.39 m)
20.6 ft
(6.28 ft)
**********
**********
15 ft
(4.57 m)
16.5 ft
(5.03 m)
16.6 ft
(5.06 m)
17.3 ft
(5.27 m)
19.5 ft
(5.94 m)
22.7 ft
(6.92 m)
**********
20 ft
(6.1 m)
16.5 ft
(5.03 m)
16.6 ft
(5.06 m)
17.1 ft
(5.21 m)
18.9 ft
(5.76 m)
21.5 ft
(6.55 m)
24.8 ft
(7.55 m)
25 ft
(7.62 m)
16.5 ft
(5.03 m)
16.6 ft
(5.06 m)
17 ft
(5.18 m)
18.4 ft
(5.61 m)
20.7 ft
(6.31 m)
23.5
(7.16 m)
30 ft
(9.14 m)
16.5 ft
(5.03 m)
16.6 ft
(5.06 m)
16.9 ft
(5.15 m)
18.1 ft
(5.52 m)
20 ft
(6.10 m)
22.6 ft
(6.89 m)
35 ft
(10.67 m)
16.5 ft
(5.03 m)
16.6 ft
(5.06 m)
16.9 ft
(5.15 m)
17.9 ft
(5.46 m)
19.6 ft
(5.97 m)
21.8 ft
(6.64 m)
40 ft
(12.19 m)
16.5 ft
(5.03 m)
16.5 ft
(5.03 m)
16.8 ft
(5.12 m)
17.7 ft
(5.40 m)
19.2 ft
(5.85 m)
21.2 ft
(6.46 m)
50 ft
(15.24 m)
16.5 ft
(5.03 m)
16.5 ft
(5.03 m)
16.7 ft
(5.10 m)
17.5 ft
(5.33 m)
18.7 ft
(5.70 m)
20.4 ft
(6.22 m)
B
A
C
0 ft
(0.00 m)
2 ft
(0.61 m)
5 ft
(1.52 m)
10 ft
(3.05 m)
15 ft
(4.57 m)
20 ft
(6.1 m)
A=Setback Distance
B=Working Distance Along Edge
C=Clearance Required
********** (Indicates distance
along edge is outside safe work
radius for setback distance)
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