4
ANCHORAGE STRENGTH - GUIDE CABLE:
The table in Figure 2 provides approximate recommended anchorage
strengths for various system configurations using 200 ft. (61 m) long, 5/8 inch (1.5875 m), 7x19 steel aircraft cable.
Figure 2 - Installation Options and Guide Cable Anchorage Strengths
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A
A
Guide Cable Suspension Bar
B
Guide Cable Sleeve
C1
Guide Cable - Theoretical straight line
C2
Guide Cable - Line with Sag
D
Angle of Guide Cable from Vertical
E
Initial Guide Cable Sag
F
Center of Span
A
B
F
D
E
C1
C2
Angle of Guide Cable
from vertical
Length of System
Initial Guide Cable Sag
Recommended Anchorage Strength
(Including 2:1 Safety Factor)
45 Degrees
115 ft (35m)
8.3 ft (2.5 m)
2800 lbs (12.46 kN)
45 Degrees
200 ft (61m)
14.4 ft (4.4 m)
3050 lbs (13.57 kN)
60 Degrees
115 ft (35m)
5.5 ft (1.7 m)
3750 lbs (16.68 kN)
60 Degrees
200 ft (61m)
10.0 ft (3.1 m)
4100 lbs (18.24 kN)
75 Degrees
115 ft (35m)
2.9 ft (0.9 m)
6900 lbs (30.69 kN)
75 Degrees
200 ft (61m)
5.1 ft (1.6 m)
7500 lbs (33.36 kN)
3.0 INSTALLATION AND USE
3.1 BEFORE EACH USE:
Carefully inspect the Emergency Descent Device in accordance with Section 5 of this instruction.
3.2 PLANNING:
Plan your emergency escape system and how it will be used before starting your work. Consider all factors
that will affect your safety before, during, and after an escape. Consider the following when planning your system:
A. ANCHORAGE:
Select a rigid anchorage point that is capable of supporting the load as specified by Section 2.3 in this
instruction.
B. DESCENT PATH AND LANDING AREA CLEARANCE:
The planned descent path must be unobstructed. The
landing area must be clear of obstructions to permit safe landing of the user. Failure to provide an unobstructed
descent path and landing area may result in serious injury.
C. TEST THE SYSTEM:
3M Fall Protection recommends performing a test descent using a 120 lb (55 kg) test weight.
The descent speed should be uniform and allow the user to reach the landing area safely. The descent speed should
be approximately as stated in Section 1.2B.
NOTE:
The Emergency Descent Device does not need to be returned to a service center after a test descent.
D. SHARP EDGES:
Avoid using this equipment where system components will be in contact with, or abrade against,
unprotected sharp edges. If working with this equipment near sharp edges is unavoidable, cover the sharp edge with
a heavy pad.
