Covers every scaffold except aerial lifts (see 1926.453). Capacity (a): each scaffold and component holds its own weight plus four times its maximum intended load without failure; roof and floor connections and counterweights on adjustable suspension scaffolds resist the larger of 4 times the tipping moment at the hoist's rated load or 1.5 times that at stall load; suspension ropes and hardware carry 6 times the maximum intended load (adjustable scaffolds: at the larger of rated load or 2 times stall load); hoist stall load is capped at 3 times rated load. A qualified person designs each scaffold, and it is built and loaded to match. Platforms (b): working levels fully planked or decked, gaps no wider than 1 inch (up to 9 1/2 inches beside uprights where the employer shows the need), except platforms used only as walkways or only by erectors and dismantlers. Width at least 18 inches, or 12 inches for ladder jack, top plate bracket, roof bracket (stayed) and pump jack scaffolds, none for boatswains' chairs; narrower only where the employer shows space forbids it, with guardrails or fall arrest. Front edge within 14 inches of the work face (3 inches outrigger, 18 inches plastering and lathing) unless guarded or fall arrest is used. Ends extend at least 6 inches past the support centerline unless cleated or restrained, and overhang at most 12 inches (platforms 10 feet or shorter) or 18 inches (longer) unless built not to tip or guarded against access. Abutted ends need separate supports; overlaps sit over supports and are 12 inches or more unless fastened; no opaque finish on wood platforms; parts from different makers mixed only if they fit without force and stay structurally sound (modified to mix only with competent person approval), and dissimilar metals combined only where a competent person finds galvanic action will not weaken them. Supported scaffolds (c): above a 4:1 height to base ratio, guys, ties or braces follow the manufacturer's recommendations or start at the horizontal member nearest the 4:1 height and repeat vertically every 20 feet (3 feet wide or less) or 26 feet (wider), the top one within the 4:1 height of the top, at each end and every 30 feet horizontally; eccentric loads also need restraint. Legs sit on base plates with mud sills or other firm foundation, plumb and braced; no unstable objects or undesigned front-end loaders; forklifts only with the whole platform attached and no travel while occupied. Suspension scaffolds (d): support devices bear on surfaces good for 4 times the rated-load force (or 1.5 times at stall, whichever is greater); outrigger beams of structural metal, stabilized by direct connections a competent person evaluates before use (masons' multi-point: engineer designed, never counterweighted) or by purpose-made, non-flowable counterweights fixed mechanically and left on until disassembly; beams without direct connections also need tiebacks, as strong as the suspension ropes, to sound anchorages (never standpipes, vents, piping or conduit). Drums keep four or more wraps at lowest travel; no repaired wire rope; a competent person checks ropes before every workshift and after any event that might affect them, replacing them for listed defects (such as six random broken wires in one lay or three in one strand). At least 3 rope clips, 6 rope diameters apart, retightened after first loading and at each workshift start. Hoists tested by a qualified testing laboratory, with enclosed gears and brakes on powered hoists and an automatic secondary brake or pawl; no gasoline equipment; sway controlled where a competent person finds it necessary. Access (e): required where a platform is over 2 feet above or below the access point, never by crossbraces; ladder, stair tower, ramp and frame dimensions apply, with rest platforms every 35 feet (12 feet for stairway ladders); for erectors and dismantlers a competent person decides whether safe access is feasible. Use (f): no overloading; shore and lean-to scaffolds banned; a competent person inspects for visible defects ahead of every shift and after any event affecting integrity, with damaged parts repaired, replaced or removed from service; no horizontal moves with workers aboard unless engineered or done under 1926.452(w); power line clearances from 3 feet up to 10 feet plus 0.4 inches per kV above 50 kV unless closer work is necessary and the utility or system operator, once notified, deenergizes, relocates or covers the lines; erection, moving, dismantling or alteration only under competent person supervision by trained workers that person selects; no work on platforms slick with snow, ice or similar material other than to remove it; tag lines or equivalent on swinging loads that could strike the scaffold; nor in storms or high winds without competent person approval plus fall arrest or wind screens; no debris, makeshift boxes or barrels, and ladders only on large area scaffolds under stated conditions; deflection capped at 1/60 of span; welding precautions. Fall protection (g) above 10 feet, by scaffold type, and for erectors and dismantlers wherever a competent person finds it feasible and not a greater hazard; guardrails 38 to 45 inches high (36 to 45 for supported scaffolds put into service prior to January 1, 2000, and suspended scaffolds needing both systems); toprails good for 200 pounds (100 on single-point and two-point adjustable suspension scaffolds). Falling objects (h): hardhats plus toeboards, screens, barricades, canopies or nets; toeboards at least 3 1/2 inches high and good for 50 pounds.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.