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4.0 Calculating Fall Clearance
Distance
It is essential to understand how to
calculate the fall clearance distance
required for each work application to
avoid contact with a lower level.
The basic calculation shown below and the
related figures on page 45 may be used to
determine Required Fall Clearance when
using a SRL in an overhead application.
See Table 2: Minimum Required Fall
Clearances.
4.1 Self-Retracting Lifeline Fall
Clearance Calculation (See Fig. G)
[Calculation taken from work level]
Maximum Arrest Distance (MAD)
+ [Non-Standing Work Position Factor
(NSF)]
+ [Swing Fall Factor (SFF)]
+ 3 ft (0.9 m) Safety Factor (SF) =
Required Fall Clearance (RFC)
CAUTION: Read all notes and refer
to all Self-Retracting Lifeline fall
clearance
diagrams
to determine exact required fall
clearance for your application.
TABLE 2: Minimum Required Fall Clearances
Maximum
Arrest Distance
of SRL
24 in (0.6 m)
39 in (1 m)
42 in (1 m)
*This chart shows general minimum fall clearances required. An exact calculation, based on the SRL/
Fall Limiter to be used and an assessment of the work site and conditions that may affect the worker's fall
clearance, must be performed.
and
labels
Minimum Required Fall Clearance
from Work Level to Lower Level*
When Working Directly
Below Anchor Point
In Kneeling/
In Standing
Crouched
Position
Position
5 ft (1.5 m)
8 ft (2.4 m)
6 ft - 3 in
9 ft - 3 in
(1.9 m)
7 ft - 6 in
10 ft - 6 in
(2.3 m)
IMPORTANT NOTES:
Self-Retracting
anchored
accuracy of the fall clearance calculation
and related information.
It is important to understand that other
factors, such as whether the user is
performing work in a standing, crouched
or lying down position and/or whether
the user is working directly below the
anchor point or at an angle, can affect fall
distance when using a retractable device.
The SRL fall clearance calculation
assumes the user is standing. If the user
will be performing work in a crouched
or kneeling position, an additional 3 ft
(0,9m) of fall clearance is required (see
Fig. H). If the user will be performing work
in a lying down position, an additional 5
ft (1,5m) of fall clearance is required.
The
Self-Retracting
clearance calculation also assumes the
user is working directly below the anchor
point, minimizing any possibility for a
swing fall. In a swing fall situation, the
total fall distance will be greater than if
the user were working directly below the
anchor point (see Fig. I).
In Lying
Down
Position
10 ft (3.1 m)
11 ft - 3 in
(2.8 m)
(3.4 m)
12 ft - 6 in
(3.2 m)
(3.8 m)
12
Lifelines
overhead
to
ensure
Lifelines
When NOT Working
Directly Below
Anchor Point
In Potential
Swing Fall Position
Varies - Additional
Fall Clearance
Required
must
be
the
fall
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