R 408.10575h Suspension wire ropes and rope connections.

Rule 575h. (1) Each specific installation shall use suspension wire ropes or combination cable and connections that are in compliance with the specifications recommended by the manufacturer of the hoisting machine that is used. Connections shall be capable of developing not less than 80% of the rated breaking strength of the wire rope. (2) Each suspension rope shall have a design factor of not less than 10. The design factor is the ratio of the rated strength of the suspension wire rope to the rated working load and shall be calculated using the following formula: F = S(N) W Where: F Design factor S Manufacturer’s rated strength of 1 suspension rope. N Number of suspension ropes under 1 load W Rated working load on all ropes at any point of travel. (3) Suspension wire rope grade shall be at least improved plow steel or equivalent. (4) Suspension wire ropes shall be sized to be in compliance with the required design factor, but shall not be less than 5/16 of an inch (7.94 mm) in diameter. (5) A reverse bend in wire rope shall not be permitted. (6) A bend radius in wire rope shall not be less than 20 times the wire rope diameter. (7) Wire rope shall be inspected and maintained as specified in the provisions of R 408.10582.