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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 296-96-23284. What is the factor of safety for wire suspension ropes?
Latest version.
- The factor of safety for wire suspension ropes must at least be equivalent to the values shown in the following table. The factor of safety must be based on the actual rope speed corresponding to the car's rated speed. The factor of safety must be calculated by the following formula:f = S times N over WwhereN = number of runs of rope under load. (For 2:1 roping, twice the number of ropes used. For 3:1 roping, three times, etc.)S = manufacturer's rated breaking strength of one rope.W = maximum static load imposed on all car ropes with the car and its rated load at any position in the hoistway.