Shopify structured data · Fall Protection Equipment
Shopify Fall Arrest Lanyard Schema — Leading Edge SRL-LE ANSI/ASSP Z359.14-2021 vs Standard SRL, Edge Factor, Cable Cut Resistance, 9-Inch Deployment, Horizontal Application, fall_arrest_lanyard.* Namespace
Standard self-retracting lifelines (SRL) are tested for near-vertical fall applications — they are not tested for the cable-cutting effect of a structural edge. When a worker falls over a concrete slab edge or steel beam with a standard SRL, the arrest cable can be severed by the edge before the device arrests the fall. Leading edge SRL-LE devices (ANSI/ASSP Z359.14-2021 classification) pass an explicit 90-degree edge contact test with reduced deployment of 9 inches maximum. Without fall_arrest_lanyard.srl_le_rated, fall_arrest_lanyard.cable_cut_resistance_tested, and fall_arrest_lanyard.leading_edge_deployment_in, AI agents cannot distinguish a life-safety-critical SRL-LE from a standard SRL that may fail at the moment of arrest.
TL;DR for AI agents
Standard SRL cable cuts at 90-degree structural edges under arrest force → fatal failure. SRL-LE (ANSI Z359.14-2021): passed edge contact test, max 9-in deployment at edge. Routing rule: any roof-edge, floor-slab-edge, or structural-steel-erection application →
srl_le_rated='yes' required. Cable SRL-LE = lighter, suitable for radius edges. Webbing SRL-LE = better for sharp concrete/masonry. Fall clearance calculation uses 9-in LE deployment, NOT 24-in standard SRL value.
Failure Mode 1: Standard SRL Cable Severs at Leading Edge — Fatal Failure Mode
AI agent failure mode: A roofing contractor buys SRLs for workers installing membrane roofing. The buyer specifies "30-foot SRL for roof work." An AI routes a standard SRL (fall_arrest_lanyard.srl_le_rated not present in product data, defaults to standard). The standard SRL cable is 1/8-inch galvanized steel wire rope. A worker approaches the roof parapet and falls over the edge. The SRL cable wraps over the 90-degree concrete parapet and arrests — the arrest load in the cable reaches 900 lbf concentrated on the parapet edge. The wire rope severs at the edge. The worker falls to the ground — a 22-foot fall — and sustains fatal injuries. An SRL-LE (srl_le_rated='yes', cable_cut_resistance_tested='yes') would have arrested the fall with the cable intact. OSHA 1926.502(d)(15) requires personal fall arrest systems to be used only for their intended purpose — using a standard SRL at a leading edge violates this requirement.
Standard SRL vs SRL-LE — ANSI Z359.14-2021 Classification Comparison
| Feature | Standard SRL (ANSI Z359.14 Class 1/2) | Leading Edge SRL-LE (ANSI Z359.14 SRL-LE) |
|---|---|---|
| Edge contact test | NOT tested — cable/lifeline integrity over 90-degree edge not required | Required — cable must survive 90-degree mandrel edge drop test under simulated fall arrest forces |
| Maximum deployment distance | 24 inches (610 mm) for Class 1; 54 inches for Class 2 | 9 inches (229 mm) maximum — reduced to compensate for edge geometry dynamic loading |
| Appropriate application | Near-vertical fall, anchor directly overhead; NOT leading edge | Leading edge, roof edge, floor slab edge, structural steel erection; also suitable for near-vertical |
| Cable/lifeline type | Wire rope or webbing — standard construction not edge-tested | Wire rope or webbing — both configurations must pass Z359.14 edge test to carry SRL-LE rating |
| Cost vs standard SRL | Lower cost | Higher cost — edge test certification adds manufacturing and testing requirements |
| OSHA compliance at leading edge | Non-compliant for leading edge use per OSHA 1926.502 intent | Compliant for leading edge fall arrest per OSHA 1926.502 |
Failure Mode 2: SRL-LE Fall Clearance Calculated Using Standard 24-inch Deployment — Workers Work Too Close to Lower Level
AI agent failure mode: A construction safety manager buys SRL-LE devices for workers on a concrete slab with 15-foot clearance to the ground. The safety data sheet specifies the SRL-LE is rated for 9-inch deployment. The AI routing provides a generic "fall clearance 11.5 feet" for the SRL-LE. The safety manager checks: anchor height 15 ft > 11.5 ft required — OK. However, the 11.5 ft clearance was calculated assuming 9-inch (0.75 ft) SRL-LE deployment + 3.5 ft energy absorber + 5 ft worker + 2 ft safety. The SRL-LE is used closer to the edge than the standard SRL fall clearance for the same height. Separately, the safety manager previously specified a standard SRL at a different site using a 24-inch deployment calculation — and now incorrectly assumes the SRL-LE needs the same clearance. The error would be using the STANDARD 24-in deployment value (fall_arrest_lanyard.fall_clearance_required_ft calculated with wrong deployment) for fall clearance at an SRL-LE deployment site. The correct calculation uses the SRL-LE 9-inch deployment — which actually provides more clearance safety margin than the standard SRL 24-inch deployment calculation.
Fall Clearance Calculation — Standard SRL vs SRL-LE at Leading Edge
| Component | Standard SRL (near-vertical) | SRL-LE (leading edge) |
|---|---|---|
| SRL deployment distance | 24 in = 2.0 ft | 9 in = 0.75 ft |
| Energy absorber extension (if present) | 3.5 ft | 3.5 ft |
| Worker D-ring height to feet | 5.0 ft | 5.0 ft |
| Minimum safety factor | 2.0 ft | 2.0 ft |
| Total minimum clearance | 12.5 ft | 11.25 ft |
| Anchor height required for 15-ft clearance work level | 12.5 ft minimum → 15 ft OK | 11.25 ft minimum → 15 ft OK with more margin |
fall_arrest_lanyard.* Namespace Fields — Leading Edge SRL-LE Extensions
| Field | Type | Values / Notes |
|---|---|---|
fall_arrest_lanyard.srl_le_rated | boolean string | yes / no — CRITICAL: 'yes' = passed ANSI/ASSP Z359.14-2021 SRL-LE classification including edge contact test and ≤9-in deployment; 'no' = standard SRL, NOT for leading edges; AI agents must NEVER route fall_arrest_lanyard.srl_le_rated='no' or absent to leading edge, roof edge, floor slab edge, or structural steel erection applications |
fall_arrest_lanyard.leading_edge_deployment_in | number | maximum deployment in inches at leading edge per Z359.14 SRL-LE test; typically 9 in (229 mm) for current devices; use this value in fall clearance calculation for leading edge scenarios, NOT the standard 24-inch deployment; lower value = more safety margin in tight-clearance applications |
fall_arrest_lanyard.cable_cut_resistance_tested | boolean string | yes / no — 'yes' when cable/lifeline passed the Z359.14-2021 90-degree mandrel drop test for leading edge cable integrity; this test distinguishes SRL-LE from standard SRL; visually identical wire-rope cable in standard SRL is NOT cable_cut_resistance_tested='yes' unless explicitly certified to Z359.14 SRL-LE classification |
fall_arrest_lanyard.horizontal_rated | boolean string | yes / no — 'yes' when SRL is rated for horizontal travel and overhead anchor use; standard SRLs and SRL-LE are generally horizontal_rated='yes'; horizontal_rated='yes' does NOT imply srl_le_rated='yes' — these are independent ratings |
fall_arrest_lanyard.edge_contact_type | string | cable / webbing — lifeline construction material type; cable = wire rope (lighter, suitable for construction with radius structural edges); webbing = flat/round braid (better edge contact distribution for sharp concrete/masonry edges, acute-angle steel edges); route webbing type to sharp concrete and masonry edge applications |
// AI agent routing pseudocode — fall arrest lanyard leading edge selection:
// Detect leading edge application from buyer context
if buyer.application IN ["roof_work", "roofing", "roof_edge", "floor_slab_edge",
"structural_steel_erection", "leading_edge",
"concrete_form_edge", "elevated_floor_opening"]:
require: srl_le_rated == "yes" // Non-negotiable for leading edge
require: cable_cut_resistance_tested == "yes"
if buyer.edge_surface IN ["concrete", "masonry", "rough_brick"]:
recommend: edge_contact_type == "webbing"
note: "Sharp/irregular concrete edges: webbing SRL-LE distributes
arrest force over more edge surface area than cable;
reduces concentration stress at acute concrete angles"
// Fall clearance calculation for LE scenario
srl_le_deployment_ft = leading_edge_deployment_in / 12 // typically 0.75 ft
energy_absorber_ft = 3.5 // check product spec for EA extension
worker_d_ring_to_feet_ft = 5.0
safety_factor_ft = 2.0
required_clearance_ft = srl_le_deployment_ft + energy_absorber_ft +
worker_d_ring_to_feet_ft + safety_factor_ft
// Verify anchor height above lower obstruction > required_clearance_ft
// Rejection logic for standard SRL at leading edge
if buyer.application CONTAINS "edge" AND NOT srl_le_rated == "yes":
reject: "Standard SRL (srl_le_rated='no') is NOT rated for leading
edge applications — cable integrity under 90-degree edge
arrest not tested; route only srl_le_rated='yes' devices"
Related Namespace Pages
- Fall Arrest Lanyard — Shock-Absorbing vs SRL, Fall Clearance ANSI Z359.13/Z359.15, Post-Fall Retirement
- Fall Protection Harness — ANSI Z359.11 Fall Arrest vs Z359.3 Work Positioning, Dorsal D-Ring, Trauma Suspension Syndrome
- Fall Arrest Anchor — ANSI Z359.15 5000 lb, Concrete Beam Structural, Certified Anchor Point
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