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What is a Coupling?
A Coupling is one of the three parts of a personal fall protection system and is the part that connects the harness to the anchorage device.
The Coupling is connected to the harness and the anchorage device using connectors – such as carabiners, hooks and quick links – in accordance with EN 362.
If the user connects the Coupling with an EN 362 connector directly to a static load-bearing structure, such as a scaffold tube, ladder rung or brace in a lattice tower, it is essential to consider the minimum required strength of the structure.
The minimum required strength of the structure is specified in the Coupling’s instructions for use and is normally between 12 kN (1,200 kg) and 18 kN (1,800 kg).
Note: Many Couplings comply with several EN standards and may therefore be compatible with several different personal fall protection systems.
Couplings in a Fall Arrest System
- EN 355 Energy Absorber Lanyard
- EN 360 Retractable Type Fall Arrester (Self-Retracting Lifeline)
- EN 353-2 Guided Type Fall Arrester on a Flexible Line (kernmantle rope)
- EN 1891 Type A Static Kernmantle Rope
- EN 353-1 Guided Type Fall Arrester on a Rigid Vertical Lifeline (wire rope or rail)
Important: To ensure that the user does not strike the ground or another obstacle below, the minimum clear space required beneath the user must be taken into account. This is called clearance distance.
The clearance distance is the distance required by the Coupling in a fall-arrest system to slow and stop a free fall. Information about the required clearance distance is specified in the Coupling’s instructions for use.
If the anchorage device can deflect, stretch, bend or otherwise increase the overall length of the system, this additional distance must be added to the required clearance distance.
Couplings in a Work Positioning System
Couplings in a Restraint System
Couplings in a Rope Access System
- EN 12841 Type A Rope Adjustment Device: Backup Device on a Safety Line
- EN 12841 Type B Rope Adjustment Device: Ascender on a Working Line
- EN 12841 Type C Rope Adjustment Device: Descender on a Working Line
- EN 353-2 Guided Type Fall Arrester on a Flexible Line (kernmantle rope)
- EN 1891 Type A Static Kernmantle Rope