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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.
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: