13

Fc < 6 kN Fc < 6 kNFc > 6 kN Fc > 6 kNFc < 6 kN Fc < 6 kNFc > 6 kN Fc > 6 kN

Clearance disregarded

Clearance

Lanyard with ABSORBICA-I or Y energy absorber

JANE or PROGRESS lanyard without energy absorber

Example for 100 kg

To learn more about calculating clearance, see the technical information available at www.petzl.com

Impact force A fall-arrest system allows the impact force experienced by the user to be limited.

It is typically made up of an energy absorber that tears in order to limit the forces over a specific stopping distance.

A dynamic rope lanyard has a low capacity for energy absorption. Its use requires taking great precautions: reducing the potential fall distance and staying in a work position below the anchor.

A webbing lanyard or a cable, with no capacity for energy absorption, can not be used to arrest a fall.

Clearance Clearance is the minimum amount of clear space below the user that prevents the user from hitting an obstacle in the event of a fall.

Clearance takes into account: - the user s weight - the length of the fall - the tearing length of the energy absorber - the average height of the user - a safety margin of 1 meter

Clearance value

The tearing length of the energy absorber, depending on the fall, can only be known based on the manufacturer s information; this is why a clearance estimate is suggested in the Instructions for Use for each fall-arrest device.

Anticipating the means of rapid evacuation Limiting the effects of inert suspension:

In the event of a fall where the worker loses consciousness or is incapacitated, inert suspension in the harness presents a mortal danger requiring an urgent response. Work teams must be equipped and trained to quickly evacuate an injured team member.

Evacuating a victim without assistance:

Procedures for evacuating workers should be determined whenever a new worksite is established.

Releasable systems can be created during installation of working ropes to allow evacuation from below.

Working alone must be prohibited: a worker may find him/herself alone at height, but at least one person trained in evacuations should be present and equipped on site.

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