An SRL consists of a retractable line, which may be made of cable, webbing, or rope, that extends and retracts from a housing unit automatically. This mechanism allows the line to adjust to the movement of the user, keeping the line taut but with enough slack to allow free movement. In the event of a fall, the device quickly locks to arrest the fall within a short distance.
ANSI Classifications
The transition from classifying Self-Retracting Lifelines (SRLs) as Class A and Class B to Class 1 and Class 2 was a part of the updates made in the ANSI/ASSP Z359.14-2021 standard. This change reflects a shift in focus towards clearer and more specific usage and performance criteria for SRLs. Here’s an overview of the transition and what it entails:
Original Classification (Class A and Class B)
- Class A SRLs: A max arrest force of 1,800 lbs and an average arrest force of 1,350 lbs. The max arrest distance was 24".
- Class B SRLs: A max arrest force of 1,800 lbs and an average arrest force of 900 lbs. The max arrest distance was 54".
New Classification (Class 1 and Class 2)
- Class 1 SRLs: A max arrest force of 1,800 lbs and an average arrest force of 1,350 lbs. The max arrest distance is 42". Anchors at or above dorsal D-Ring.
- Class 2 SRLs: A max arrest force of 1,800 lbs and an average arrest force of 1,350 lbs. The max arrest distance is 42". Anchors up to 5 feet below dorsal D-Ring AND must be rated to withstand falls on a leading edge.
Types of SRLs
- Standard SRLs (Class 1): Used in situations where the anchor point is overhead, minimizing the fall distance.
- Leading Edge SRLs (Class 2): Designed to handle situations where the lifeline may come into contact with an edge during a fall. These SRLs have additional features like reinforced cables and specialized edge-tested mechanisms.
- Compact and Mini SRLs: Smaller in size and lighter, making them ideal for tasks requiring greater mobility and less weight.
