User Instructions - English
14
Fall Clearance
from Working Surface
to Next Lower Level
Self-Retracting Lifeline/Fall Limiter Fall Clearance:
Fall clearance requirements when using a self-retracting
lifeline (SRL) or fall limiter are taken from the working surface
to the next lower level.
Fall clearance calculations are based on the length and
deflection of the lifeline, a 3-1/2 ft. (1.07m) maximum Miller
SRL/fall limiter fall arrest distance, and the number of workers
connected to the system. The SRL/fall limiter calculations as-
sume the worker is standing upright and is located directly ad-
jacent to the horizontal lifeline with the SRL/fall limiter directly
overhead and above the level of the harness attachment
point. Working away from the point of attachment or crouch-
ing to perform work increases the amount of fall clearance
required. All of these factors must be carefully considered to
ensure that there is adequate fall clearance.
~IMPORTANT~
Miller Fall Protection
always recommends that
a 3 ft. (.9m) safety factor
be added to all
fall clearance calculations
provided in these tables.
If, in your particular application, there is not adequate
fall clearance to ensure maximum worker safety, contact
Miller Technical Services to discuss your options. Any
variations to the horizontal lifeline system must be ap-
proved by Miller Fall Protection.
**For lifeline spans between the span lengths listed in the fall
clearance charts, use the next higher lifeline span calcula-
tions. Example: For a 70 ft. lifeline, use the 90 ft. fall clearance
calculations.
Total Fall Clearance Required*
for One to Two Workers
and Three to Four Workers
when using a
Self-Retracting Lifeline/Fall Limiter
with a Xenon HLL System
Single-Span Systems
System/
Span
Length**
[ft (m)]
Single
Shock Absorber System
for 1-2 Workers
Double
Shock Absorber System
for 3-4 Workers
10
(3m)
9’-7”
(2.92m)
10’-5”
(3.18m)
15
(4.5m)
10’-1”
(3.07m)
11’-1”
(3.38m)
20
(6.1m)
10’-6”
(3.2m)
11’-7½”
(3.55m)
25
(7.6m)
10’-11”
(3.33m)
12’-2”
(3.71m)
30
(9.1m)
11’-3½”
(3.44m)
12’-8”
(3.86m)
Multiple-Span Systems (with 30 ft. spans)
System
Length
[ft (m)]
Single
Shock Absorber System
for 1-2 Workers
Double
Shock Absorber System
for 3-4 Workers
30
(9.1m)
11’-3½”
(3.44m)
12’-8”
(3.86m)
60
(18.2m)
11’-6½”
(3.52m)
12’-10½”
(3.93m)
90
(27.4m)
11’-9”
(3.58m)
13’-1”
(3.99m)
120
(36.5m)
11’-11½”
(3.65m)
13’-3”
(4.04m)
150
(45.7m)
12’-1½”
(3.7m)
13’-5”
(4.09m)
180
(54.8m)
12’-3½”
(3.75m)
13’-7”
(4.14m)
210
(64m)
12’-5”
(3.79m)
13’-9”
(4.19m)
240
(73.1m)
12’-7”
(3.83m)
13’-11”
(4.24m)
270
(82.2m)
12’-8½”
(3.87m)
14’-½”
(4.28m)
300
(91.4m)
12’-10”
(3.91m)
14’-2”
(4.32m)
330
(100.5m)
12’-11½”
(3.95m)
14’-3½”
(4.36m)
360
(109.7m)
13’-1”
(3.99m)
14’-5”
(4.4m)
390
(118.8m)
13’-2”
(4.01m)
14’-6½”
(4.43m)
420
(128m)
13’-3½”
(4.05m)
14’-8”
(4.47m)
450
(137.1m)
13’-4½”
(4.08m)
14’-9”
(4.5m)
480
(146.3m)
13’-6”
(4.12m)
14’-10½”
(4.54m)
510
(155.4m)
13’-7”
(4.14m)
15’
(4.57m)
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