§ 7.56. Cables.
(a) At least three hoisting cables shall be used on all traction-type passenger elevators not already in use.
(b) Hoisting and counterweight cables shall be composed of iron or steel of high quality. The minimum diameter for any cable shall be 1/2 inch. When different diameters of cables from those given in subsection (c) are necessary, the strength of such cables shall be computed in the same ratio as shown in that subsection. When the material of existing hoisting and counterweight cables is unknown such cables shall be assumed to be of iron and the lifting capacity of the installation rated accordingly.
(c) No hoist or counterweight cable shall be stressed beyond a factor of safety as follows:
Cable Speed
(in feet per minute)Factor of Safety 50 7.60 100 7.95 150 8.25 200 8.60 250 8.90 300 9.20 350 9.50 400 9.75 450 10.00 500 10.25 600 10.70 700 11.00 800 11.25 900 11.45 1000 11.55 1200 11.80 1400 11.90 1500 11.90 (d) Only approved types of cable fastenings shall be used.
(e) Where cables pass through the floors on the outside of shaftway enclosures, solid enclosures or standard metal guards shall be provided to a height of at least six feet.
(f) In new installations, the diameters of drums and sheaves shall be at least 40 times the diameter of the cables used. In existing installations, the drums and sheave diameters may be accepted if changes are not considered necessary by the Department.
(g) There shall be at least two wraps of the hoisting and counterweight cables on the drums of passenger elevators of the winding drum type when ei ther the car or counterweights are at the limits of travel. The ends of the cables shall be clamped on the inside of the drum.
(h) Cables shall be provided with a means for equalizing. Drum-type elevators shall be provided with eveners. On existing installations the requirement for cable equalizers need not be complied with until the next cable renewal. Such equalizers shall be fastened in position with a nut, locknut, and cotter pin. Coil or helical springs, when used, shall be of a design which does not permit full compression under normal load. The ropes of the car and drum counterweights of power-driven elevators having drum type driving machines shall be reshackled every 2 years, except when auxiliary rope fastening devices are installed. Reshackling is required when the auxiliary rope fastener indicates failure of any rope fastening. Crosby clips and heart shackles shall be included, two to one roped under slung drum elevators are exempted. A metal tag shall be placed on the rope to show the reshackling date and the person who performed the work.
(i) A metal data tag shall be securely attached to one of the wire rope fastenings. A new tag shall be installed at each rope renewal. A data tag shall bear the following data:
(1) The diameter in inches.
(2) The breaking strength, as rated by the manufacturer.
(3) The grade of material used.
(4) The month and year the ropes were installed.
(5) Whether nonperformed or performed.
(6) The construction classification.
(7) The name of the person or firm who installed ropes.
(8) The name of the manufacturer of the rope.
Source The provisions of this § 7.56 amended through June 28, 1967.
Cross References This section cited in 34 Pa. Code § 7.36 (relating to data plates and numbering); and 34 Pa. Code § 7.71 (relating to conflicts).
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