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2.8 SELF-RETRACTING DEVICES WITH LEADING EDGE (SRL-LE):
The SRDs covered by this instruction manual
include Self-Retracting Devices with Leading Edge capabilities (SRL-LEs). See Figure 1 for specific SRL-LE models. SRL-LEs
were tested for horizontal use and falls over a steel edge without burrs. SRL-LEs may be used in situations where a fall
may occur over steel edges, such as found on steel shapes or metal sheeting.
Leading Edge Precautions:
Observe the following precautions when using SRL-LEs:
•
Users over 310 lb. (140 kg) must not use this device in Leading Edge applications.
•
The allowable angle of redirection of the lifeline portion of the SRL-LE at the edge over which a fall might occur
(measured between the two sides formed by the redirected lifeline) shall be at least 90 degrees (see Figure 7).
•
The anchor point shall be situated at the same height as the edge at which a fall might occur or above the edge.
Anchor points below the edge are dangerous because they cause the lifeline to redirect at an angle sharper than 90
degrees (see Figure 7).
• Consult Section 1
for limitations to the allowable work area relative to the anchorage point, including factors such
as swing fall and abrasion on the line at the edge and the use of a single anchor point versus anchors that allow
horizontal movement (e.g., Horizontal Lifeline or Horizontal Rail).
• SRD-LEs may be used with a Horizontal Lifeline or Horizontal Rail only as instructed in the product instructions for the
Horizontal Lifeline or Horizontal Rail.
• Do not work on the far side of an opening opposite the SRL-LE anchorage point.
• In the event of a fall over the edge, special rescue measures may be required.
• When planning your Leading Edge application, be sure work area parameters are within the Minimum Setback
Distance, Maximum Free Fall Distance, and Minimum Fall Clearance Required when Falling Over an Edge as indicated
on the SRL-LE labeling.
• For straight line connections, the Wrap Back SRD should only be attached to a rigid anchor point if used in a Leading
Edge application.
Leading Edge Fall Clearance Calculation:
The Minimum Fall Clearance Required when Falling Over an Edge can be
calculated based on the Setback Distance and Distance Along the Edge of your Leading Edge application (see Figure 8). To
calculate Fall Clearance from the table in Figure 8:
1. Select the value closest to your Setback Distance (A) in the left-side row headings.
2. Select the value closest to your working Distance Along the Edge (B) from the top column headings. Shaded areas
with no values indicate the Distance Along the Edge is outside of the safe Work Radius for your selected Setback
Distance.
3. The Clearance Required when Falling Over an Edge (C) will be the value listed at the intersection of the row selected
in Step 1 and the column selected in Step 2.
4. Repeat the previous steps for every edge over which the worker could potentially fall to determine safe placement of
anchorage and allowable Work Radius.
CSA Z259.2.2-17 Deployment Calculation:
;
Deployment:
Deployment is equal to the Deployment Factor (D
m
) times Free Fall Distance (h) for a Maximum
Worker Mass (kg) or deployment based on the results of Dynamic Testing specified in CSA Z259.17, Clause 7.2,
whichever is greater.
•
Deployment Factor for a 141 kg mass (D
141
) = 1.1
•
When SRD is anchored overhead Maximum Deployment Distance = 1.07 m (3.5 ft.)
•
When SRD is anchored so free fall is possible, Maximum Deployment Distance = 2.75 m (9 ft.)
CE SharpVG 11.60 revision 6 VG 11.54 revision 6
