9
Do not insert extra connectors between the SRD lifeline connector and the FBH dorsal D-ring,
except an approved D-ring extender.
Use caution. Take action to avoid sharp and/or abrasive surfaces and edges when possible.
5.0 Installation and Use
5.1 Install the SRD
Examine the work area for possible hazards. Take caution to avoid overhead hazards such as cranes,
poles, overhead power cables, and walking/working surface hazards such as power cables, welding
leads, air and fluid hoses, including obstruction hazards such as vertical columns and stacks of
materials on the lower level. Eliminate hazards where possible.
Ensure the anchorage provides the Minimum Required Fall Clearance (MRFC) in the fall path below the
walking/working surface to prevent striking the lower level or an obstruction during a fall event. Take
action to avoid swing falls, which occur when the anchorage is not directly above the point where the
fall occurs.
Fall clearance and swing falls are subject to variable conditions. Anchor height, lateral movement, and
setback distance all affect anchor location with regard to fall clearance and swing fall.
The SRD may be attached to an overhead anchor, i.e. above the user’s FBH dorsal D-ring, or a non-
overhead anchor, i.e., below the user’s FBH dorsal D-ring. A non-overhead anchor may be as low as
foot level, but no more than a maximum of 5’ (1.5m) below the user’s FBH dorsal D-ring. Non-overhead
anchor locations result in greater contact between the lifeline and the edge and present greater
abrasion risk hazards.
Use of a foot level anchorage should be as a last resort, when no other anchor option exists.
Performance testing has shown that a fall event over a leading edge will alter SRD performance
characteristics and fall clearance requirements. When anchored below the FBH back D-ring fall
events will result in greater fall clearances. Reduced setback distances will also increase clearance
requirements. Non-overhead anchorage when the SRD is set back less than 5’ (1.5 m) will result in the
greatest MRFC and the least amount of worker mobility due to swing fall. Greater set back distances
of 5’ (1.5 m) or more will reduce the overall MRFC and allow for more lateral movement of the worker
when attached to a non-overhead anchorage.
If job site geometry allows it, a setback distance of 5’ (1.5 m) is recommended to take full advantage of
the SRD performance. In addition, the Angle of Redirection of the lifeline, i.e., the angle of the lifeline as
it passes over the edge, must be at 90 degrees or more, never less, see Section 5.3.
Do not attach the SRD in a manner that places the edge higher than the SRD.
5.1.1 CSA Z259.2.2-17:
Deployment is equal to depoyment factor times free-fall distance, h, see table below for deployment
factor.
FT-R Device Length
20’
30’
60’
Deployment Factor for a 140 kg mass
0.5
0.6
0.6
Maximum Deployment Distance (Overhead Anchorage)
1.5 ft (0.5 m)
2.1 ft (0.6 m)
1.8 ft (0.5 m)
Maximum Deployment Distance (1.8 m (6 ft) Free Fall)
4.0 ft (1.2 m)
4.5 ft (1.4 m)
4.4 ft (1.3 m)
Average Deployment Force
930 lbs (4.1 kN)
837 lbs (3.7 kN)
859 lbs (3.8 kN)
Maximum Arrest Force
1,660 lbs (7.4 kN)
1,564 lbs (7.0 kN)
1,587 (7.1 kN)
