Rigging equipment is inspected before use on each shift and as needed during use, and defective rigging is removed from service. Employers must ensure rigging has permanently affixed, legible manufacturer identification showing the recommended safe working load, is never loaded beyond it and is not used without that marking; rigging not in use is removed from the immediate work area; and custom grabs, hooks, clamps and lifting accessories for units such as modular panels are marked with safe working loads and proof-tested to 125 percent of rated load before use. Slings (wire rope, alloy steel chain, metal mesh, synthetic web, and natural or synthetic fiber rope) and all fastenings are inspected each day before use by a competent person the employer designates, with further inspections during use where conditions warrant, and damaged slings are removed at once. Alloy steel chain slings carry durable identification (size, grade, rated capacity, manufacturer), use attachments rated at least equal to the chain, never use makeshift hooks or links, are not loaded beyond their marked working load limit, are removed when link wear exceeds Table H-1, and receive a thorough periodic inspection at intervals set by use and service conditions but never more than 12 months apart, with a record of the month of the latest thorough inspection. Wire rope: no loads beyond marked capacity; splice strand ends covered or blunted; no knots except on scraper haul-back lines; eye splices with at least three full tucks; hoisting rope in one continuous piece except eye splices and endless slings; no eyes formed with clips or knots in bridles, slings or bull wires; removal where visible broken wires in eight diameters exceed 10 percent or other excessive wear, corrosion or defects appear; U-bolt clip number and spacing per Table H-2 with the U on the dead end; no shortening with knots or bolts, no kinking, balanced basket hitches, padding at sharp edges, hands kept out while tightening, no shock loading, no pulling a sling from under a resting load; minimum clear lengths (10 rope diameters for cable-laid and 6x19 and 6x37 slings, 40 for braided, 96 body diameters circumference for grommets and endless slings); fiber core slings permanently removed after exposure above 200 F and manufacturer guidance above 400 F or below minus 60 F for other cores; welded end attachments welded before assembly and proof-tested at twice rated capacity, with the certificate retained; and marked size, rated capacity per hitch and angle, and number of legs. Natural and synthetic fiber rope slings: not loaded beyond marked capacity; spliced to the manufacturer's recommendations (manila eye splices three full tucks and short splices six, synthetic four and eight, tails not trimmed flush, eyes giving an included angle no more than 60 degrees, no knots or non-fiber clamps instead of splices, clear length at least 10 rope diameters); used from minus 20 F to 180 F without derating; no sharp end attachments; removed for abnormal wear, powdered fiber, broken or cut fibers, strand variations, discoloration or rot, or distorted hardware; and marked with rated capacity per hitch and angle, fiber type and legs. Synthetic web slings are marked with manufacturer, rated capacities per hitch and material; used within rated capacity; of uniform webbing with fittings at least as strong as the sling and free of sharp edges; with end fittings and eyes attached only by stitching; kept away from acids or phenolics (nylon) and caustics (polyester, polypropylene, aluminum fittings); not used above 180 F (polyester, nylon) or 200 F (polypropylene); and removed for burns, melting or charring, snags, punctures, tears, cuts, broken or worn stitches or distorted fittings. Shackles are not loaded beyond marked capacity; hook safe working loads follow the manufacturer's recommendations, and hooks without them are tested at double their intended safe working load before first use, with a record of dates and results.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.