Systems required by Part 1926 meet these criteria; the employer installs them, and meets the rest of the subpart, before the work needing them begins. Guardrails: top edge 42 inches plus or minus 3 inches above the working level (plus stilt height). Where no wall or parapet reaches 21 inches, add midrails (halfway), screens, mesh, balusters at most 19 inches apart or members leaving no gap over 19 inches. The top edge resists 200 pounds outward or downward within 2 inches of the edge without deflecting below 39 inches; midrails and similar members resist 150 pounds. Rails are smooth and snag-free, at least 1/4 inch thick, never steel or plastic banding, flagged every 6 feet or less if wire rope, with no end overhang forming a projection hazard. Idle hoist openings get a chain, gate or removable section; holes are railed on every open side (gates or offsets at ladderways; material holes with at most two removable sides, covered or railed when idle); ramps are railed on open sides; fibre rope rails inspected often enough to stay strong. Safety nets: no more than 30 feet below the work surface, extending outward 8, 10 or 13 feet for a net up to 5, over 5 up to 10, or more than 10 feet below. Drop-test a 400-pound, 30 plus or minus 2 inch sandbag from the highest exposed surface (at least 42 inches above it) after installation, relocation or major repair and every 6 months in place; if testing is shown unreasonable, a signed certification record by the employer or competent person before use, kept at the jobsite. Inspected weekly and after any damaging event; debris out before the next shift; mesh no more than 36 square inches and 6 inches a side, crossings secured; 5,000-pound border rope; panel joints as strong as the net and no more than 6 inches apart. PFAS: no body belts from January 1, 1998; forged, pressed or formed steel connectors or equal, corrosion-resistant and smooth; dee-rings and snaphooks 5,000 pounds and proof-tested to 3,600 pounds; locking snaphooks only, with listed banned connections; horizontal lifelines under a qualified person with a safety factor of two; lanyards and vertical lifelines 5,000 pounds; one worker per vertical lifeline (two on a 10,000-pound line atop a guarded false car in elevator shaft work); self-retracting devices 3,000 pounds if free fall is limited to 2 feet, otherwise 5,000; anchorages independent of platform supports, 5,000 pounds per person or a qualified person's design with a safety factor of two. When arresting a fall: force at most 1,800 pounds with a harness, free fall 6 feet or less with no contact below, deceleration within 3.5 feet (Appendix C systems accepted under 310 pounds combined weight). Equipment is inspected before each use, pulled after impact until a competent person clears it, never used to hoist material or tied to guardrails or hoists. The employer arranges prompt rescue or ensures self-rescue. Positioning devices: 2 feet of free fall at most; anchorage for twice the impact load or 3,000 pounds, whichever is greater; connector and inspection rules as for PFAS. Warning lines: encircling the roofing work area at least 6 feet from the edge (10 feet from edges perpendicular to mechanical equipment travel), flagged, 34 to 39 inches high, 500-pound line, stanchions withstanding 16 pounds toward the edge at 30 inches without tipping; only roofers between line and edge. Controlled access zones: control lines 6 to 25 feet back (precast: 6 feet up to 60 feet or half the member length, whichever is less), full length, tied to guardrails or walls; for overhand bricklaying 10 to 15 feet back with end lines and only masons inside; flagged, 39 to 45 inches high (50 for bricklaying), 200-pound strength; only the guardrail needed for that day removed. Safety monitors: a designated competent person on the same surface, in sight and voice range, with no distracting duties; no mechanical equipment in the monitored roof area. Covers: twice the largest axle load in roadways, twice the imposed load elsewhere, secured, and colour coded or marked HOLE or COVER. Falling objects: toeboards 3 1/2 inches high, 50-pound strength, 1/4-inch clearance, openings of 1 inch or less, screening where piles are higher; only masonry and mortar within 4 feet of a bricklaying edge; roofing materials 6 feet from unguarded edges; canopies strong enough. Fall protection plans (leading edge, precast and residential only): site-specific, prepared and kept current by a qualified person, who also approves changes, a copy at the jobsite, run under a competent person, stating why conventional systems are infeasible or more hazardous, discussing other measures to reduce the hazard, classing each such location as a CAZ, using a safety monitor where nothing else is in place, naming the employees allowed in CAZs, and investigating any fall or near miss and making the plan changes it shows are needed.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.