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Washington Administrative Code (Last Updated: November 23, 2016) |
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Title 296. Labor and Industries, Department of |
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Chapter 296-96. Safety regulations and fees for all elevators, dumbwaiters, escalators and other conveyances. |
Section 296-96-08210. What are the requirements for suspension methods?
Latest version.
- (1) When a chassis is suspended from a driving machine by a wire rope, a single method of suspension may be used. The suspension means may be any one of the following:(a) Steel elevator wire rope;(b) Steel aircraft cable; or(c) Roller chain conforming to ANSI transmission roller chains and sprocket teeth.(2) Steel tapes must not be used as a suspension method.(3) The minimum diameter of hoist ropes or cables must be 1/4 inch galvanized elevator wire rope and 3/16 inch aircraft cable.(4) Factor of safety:(a) The minimum factor of safety for a suspension method is 5 based upon the rope tension while elevating the elevator carrying its rated load.(b) In no case, must the rated breaking strength of the rope be less than 4,000 pounds.(5) The contact arc of a wire rope on a traction sheave must be sufficient to produce adequate traction under all load conditions.(6) All wire ropes anchored to a winding drum must have at least one full turn of rope on the drum when the car or counterweight reaches its over-travel limit.(7) The winding-drum ends of car and counterweight wire ropes must be secured by:(a) Clamps on the inside of the drum;(b) Return loop;(c) Properly made individual tapered babbitted sockets; or(d) Properly attached fittings recommended by wire rope manufacturers. U-bolt type clamps must not be used.(8) The ends of wire ropes must be fastened to cars or counterweights by:(a) Return loop;(b) Properly made individual tapered babbitted sockets that conform to ASME A17.1 requirements (The diameter of the hole in the small end of the socket must not exceed the nominal diameter of the rope by more than 3/32 inch.); or(c) Properly attached fittings recommended by wire rope manufacturers. U-bolt type clamps must not be used.(9) Rope repair:(a) Car and counterweight wire ropes cannot be lengthened or repaired by splicing.(b) If a single wire rope in a set is worn or damaged and needs to be replaced, the entire set must be replaced.(10) A metal or plastic data tag must be securely attached to one of the wire rope fastenings each time the ropes are replaced or reshackled. The data tag must include:(a) The diameter of the ropes in inches; and(b) The manufacturer's rated breaking strength.