Applicable Standards
SRD's - Self Retracting Devices Self Retracting Devices (SRD’s) is a general term used describe 3 different types of devices, which are defined as: “A device that contains a drum-wound line that automatically locks at the onset of a fall to arrest the user, but that pays out from and automatically retracts onto the drum during normal movement of the person to whom the line is attached. After the onset of a fall, the device automatically locks the drum and arrests the fall. Self-Retracting Devices include Self-Retracting Lanyards (SRL’s), Self-Retracting Lanyards with integral rescue capability (SRL-R’s) and Self-Retracting Lanyards with leading edge capability, and hybrid combinations of these.” SRL’s - Self Retracting Lanyards Self-retracting lanyards are intended to be mounted to a fixed anchorage, horizontal lifeline, or rail system or trolley. They’re generally mounted overhead, and can be rigged to limit free-fall to a maximum of two feet. These devices provide a degree of lateral and vertical movement for the user. SRL-R’s - Self-Retracting Lanyards with Integral Rescue Capability This type consists of a self-retracting lanyard with an integral rescue capability. This capability uses an integral retrieval winch, which will allow a fallen or injured worker to be raised or lowered. These devices are most commonly used in confined space applications. They may be used interchangeably with SRL’s, provided that the rescuer has access to the rescue mechanism. SRL-LE - Self-Retracting Lanyards - Leading Edge Self-retracting lanyards for leading edge exposures are required to have a supplemental energy absorber at the point of attachment to the user’s FBH back D-ring. These units are designed to protect steel erectors who may be exposed to leading edge falls. They often feature a larger diameter wire rope constituent line to resist cutting and abrasion. These devices should be used as a last resort, as the application has a high degree of risk. Also, the qualification testing required by the ANSI Z359.14 standard is not comprehensive. It doesn’t anticipate hazards that may be damaging to the SRL line, such as unbeveled concrete, metal decking and joints, or gaps between beams and columns. Self Retracting Device Classes There are also two classes that are specified in the ANSI Z359.14 standard that apply to the SRL , SRL-R and the SRL-P : Class A devices , when subjected to dynamic performance testing, should have an arrest distance not exceeding 24 inches, a maximum arrest force of 1,800 pounds, and an average arrest force of 1,350 pounds. Class B devices , when subjected to dynamic performance testing, should have an arrest distance not exceeding 54 inches, a maximum arrest force of 1,800 pounds, and an average arrest force of 900 pounds. ANSI Z359 Definitions & Classes: Current Until August 2022 The recently updated ANSI/ASSP Z359.14-2021 standard mentioned on the previous page has been released, but will not become effective until August of 2022. The revised definitions and classes de - fined by the standard are included in this guide in the CONNECTING DEVICES section on pages 16 & 17. We have chosen to reference these definitions and classes with regards to the equipment outlined in this guide in anticipation of the standard's effective date.
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