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Clearance below the user
The required clearance below the user is worked out as follows:
BFD
Maximum length
Type
of the lanyard
FlexBelt Twin
Twin SK 12
Twin
3.2. Usage when used horizontally:
This BFD twin lanyard with integrated belt / fall-energy absorber has been also been
successfully tested for horizontal use and hence, a simulated fall over an edge. In this case,
a steel edge with a radius of r = 0.5 mm (without a burr) was used. Based on this test, the
equipment is suitable for use over similar edges, e.g. those on rolled-steel profile sections,
timber beams or encased, rounded roof parapets.
Regardless of this test, in the case of horizontal or angular use, where there is a risk of a fall
over an edge, the following points must be taken into consideration:
1. If the hazard assessment implemented before work commencement indicates that, in
case of the fall edge, it involves a particularly "cutting" and/or "non-burr-free" edge
(e.g. unlined roof parapet, trapezoidal corrugated sheet or sharp concrete edge), then
appropriate arrangements should be made before the start of work so that
•
falling over the edge is ruled out,
an edge protector should be installed before work starts or
contact should be made with the manufacturer.
•
2. The lanyard is tested over an edge with an angle of 90°. The user should be clear
about the increased hazards that exist when it is possible to fall over an edge with an
angle of less than 90° (measured between the two side pieces of the lanyard e.g. if
the attachment point is located below the feet of the user or, in the case of a roof
running upwards, at an angle) and that additional preventative measures or additional
tests may be necessary.
3. The required clearance below the edge is
➢ at least 5.25 m for all types: with a total weight of 136 kg
4. The subsystem should always be used so that the slack rope formation is kept as
limited as possible in the proximity of areas with a potential fall hazard. An adjustable
lanyard should not be set if, at the same time, the user moves in the direction of an
area where there is a fall hazard.
5. In order to limit a pendular fall, the working area and/or lateral movements from the
central axis to both sides should, in each case, be restricted to 1.50 m.
6. If this twin lanyard with an integrated belt / fall-energy absorber is used with a class C
anchoring device in accordance with EN 795, then the deflection of the horizontal,
mobile retainer should also be considered when determining the required height
below the user.
7. Note: In the event of falling over an edge, there is a risk of injury during the
harnessing action as a result of the falling person crashing into structural members
and/or structural parts.
8. Special rescue measures should be defined and exercised in the event of falling over
the edge.
10
Clearance below the user for an attachment
at the height of the
ridge harness eyelet
2 m
2 m
2 m
point
at the height of the base
(feet)
4.75 m
4.75 m
4.75 m
6.75 m
6.75 m
6.75 m
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