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6.0 Calculating Fall Clearance Distance
It is important to understand how to calculate potential fall clearance to avoid contact with a lower
level. The following diagram demonstrates a sample calculation using a self-retracting lifeline.
When actually calculating fall clearance distance, the authorized person/user must consider all
variables, including but not limited to, the height of the worker, the maximum arrest distance of the
self-retracting lifeline, and the position of the person (standing or crouched), and then make neces-
sary adjustments to the calculations.
Before Fall
6 ft.
(1.8m)
Height of Worker
NOTES: The arrest distance (free fall + deceleration) of 4-1/2 ft. is the maximum allowed
per ANSI standards. Maximum arrest distance varies from retractable to
retractable; however all Miller self-retracting lifelines and fall limiters meet the
ANSI requirement.
A fall clearance calculation made from the anchor point must take into
consideration the length of the anchorage connector being used and the length of
the retractable housing.
The above diagram assumes the user is working directly under the anchor point,
minimizing any possibility for a swing fall.
If there is any question about calculating fall clearance distance, please contact Miller Fall Protection
Technical Services at 1-800-873-5242.
7.0 Inspection and Maintenance
7.1 Operation and Inspection
WARNING: UNITS THAT DO NOT PASS INSPECTION OR HAVE BEEN SUBJECTED
TO FALL ARRESTING FORCES MUST BE REMOVED FROM SERVICE.
7.1.0 The following operation checkpoints and
inspections must be done prior to each use.
1. D-Ring Pin:
a. Inspect for cracks, splits. Remove from service if
present.
b. D-Ring Pin must be approximately flush (within
.030" or .76mm) with the back of the Inner Frame.
Us er Ins tru ct ion s - Engl is h
Illustration: Self-Retracting Lifeline with D-Bolt Anchorage Connector
After Fall
Bottom of Retractable
2 ft.
Maximum Free Fall Distance
2
Maximum Deceleration Distance
1 ft.
5 ft.
To Worker's Back D-Ring
3 ft.
Safety Factor
(.6m)
4
Maximum Arrest Distance
ft.
(.8m)
(per ANSI)
(.3m) Harness Stretch
(1.5m)
(.9m)
10
ft.
(1.4m)
13
(4.1m)
Flush
D-Ring Pin
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