U s e r I n s t r u c t i o n s - E n g l i s h
7
4.0 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 shock-absorbing lanyard.
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 length of the lanyard, and the
anchorage connector used, and then make necessary adjustments to the calculations.
The O-Ring Extension Option is available on any Miller shock-absorbing
lanyard and provides either a choke-through loop or snap hook on the O-ring
extension end, which connects to the back D-ring of the harness. Once at-
tached, the user may use the lanyard or a retractable, which is connected to
the O-ring of the lanyard.
1. When using a 6 ft. (1.8m) shock-absorbing lanyard and a full-body harness, first add the length of the shock-absorbing
lanyard, 6 ft. (1.8m), to the maximum elongation of the shock absorber during deceleration, 3-1/2 ft. (1.1m).
2. Next, add the height to the worker’s back D-ring, 5 ft. (1.8m) average, plus a harness stretch factor of 1 ft. (.3m).
3. Then, add 3 ft. (.9m) as a safety factor.
4. The Total, 18-1/2 ft. (5.6m) is the estimated safe fall clearance distance, the height at which you must attach to an
anchorage to minimize the risk of contact with a lower level.
NOTE: A fall clearance calculation made from the anchor point must take into
consideration the length of the anchorage connector being used.
3.4 Connecting a Lanyard
with Integral O-Ring Extension Option
3.5 Connecting a D-Ring or O-Ring Extension
The O-Ring or D-Ring Extension is simply a separate webbing extension with
a snap hook or loop on one end and a D-ring or O-ring on the other and is
connected between the harness back D-ring and the lanyard being used as
shown.
If there is any question about calculating fall clearance distance, please contact Miller Fall Protection
Technical Services Department at 1-800-873-5242.
Summary of Contents for 198RLS
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