U s e r I n s t r u c t i o n s - E n g l i s h
10
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.
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.
2 ft.
(.6m)
Maximum Free Fall Distance
2 ft.
(.8m)
Maximum Deceleration Distance
1 ft.
(.3m) Harness Stretch
5 ft.
(1.5m)
To Worker’s Back D-Ring
3 ft.
(.9m)
Safety Factor
6 ft.
(1.8m)
Height of Worker
Bottom of Retractable
13
(4.1m)
4 ft.
(1.4m)
Maximum Arrest Distance
(per ANSI)
Before Fall
After Fall
Illustration: Self-Retracting Lifeline with D-Bolt Anchorage Connector
If there is any question about calculating fall clearance distance, please contact Miller Fall Protection
Technical Services at 1-800-873-5242.
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.
7.0 Inspection and Maintenance
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.
7.1 Operation and Inspection
Flush
D-Ring Pin
Summary of Contents for MILLER TWIN TURBO
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