11
3.4
FALL CLEARANCE FOR LEADING EDGE:
The SRD models covered by this instruction include models made for use with
leading edges. Self-Retracting Devices with Leading Edge capabilities (SRD-LEs) must be used in applications where the
SRD or its lifeline may come into contact with the leading edge. Do not use any other SRD type in these applications.
A. PRECAUTIONS:
SRD-LEs have a number of unique precautions that must be observed during use. When planning use
of an SRD-LE, consider all requirements for SRD-LEs specified in these instructions.
•
Users must observe the capacity requirements specified for SRD-LE models in Table 1.
• The SRD-LE must be installed so that, in the event of a fall, the lifeline does not pass over the leading edge at an
angle less than 90 degrees. See Figure 6 for reference.
• Install the anchorage point at the same height of or above the edge where a fall might occur. Anchorage points
below the edge are dangerous because they cause the lifeline to redirect at an angle less than 90 degrees. See
Figure 6 for reference.
• Do not work on the far side of an opening opposite the anchorage point.
• Use of SRD-LEs may require special rescue procedures.
• Never use a D-ring extension with SRD-LEs in leading edge applications.
B. SHARP EDGE TESTS:
The SRD-LE models covered in this instruction have been successfully tested for horizontal use
and for falls over a steel edge without burrs. As a result, these SRD-LE models may be used in similar situations. All
requirements for use of these models must be observed, including required setback distances. Although SRD-LEs are
more resistant than SRDs, the user should still, when possible, avoid working where the lifeline will continuously or
repeatedly scrape against sharp edges and abrasive surfaces.
C. FALL CLEARANCE REQUIREMENTS:
SRD-LE models have their own fall clearance requirements that must be
observed. The SRD-LE fall clearance charts must be used for leading edge applications instead of the standard fall
clearance charts. Use of the SRD-LE fall clearance charts is not a replacement for use of an SRD-LE.
Figure 6 - Angle of Redirection
≥90°
þ
OK
ý
NO
<90°
