5
Caution: If an energy absorbing lanyard is used in conjunction with a cross-arm
anchorage connector, other anchorage extension, vertical lifeline, or horizontal lifeline, the
additional length of the anchorage connector, or sag from the lifeline must be taken into
consideration during the clearance calculation process.
Clearance Requirements
The illustration below is an example of how to calculate the fall clearance requirements using
energy absorbing lanyards connected to the dorsal D-ring of a Full Body Harness. Add the
length of the energy absorbing lanyard (6 ft) to the marked maximum elongation of the lanyard
during deceleration (3
½
ft per OSHA 1910 & 1926), to the D-ring height of the worker (average
5 ft). Add 1 ft for the harness stretch and slide of the D-ring, and a safety factor of 2 ft to
allow for the possibility of an improperly fi tted harness, a taller than average worker and/or a
miscalculation of distances. The total 17
½
ft is the suggested safe fall clearance requirement for
this example.
½
½
½
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