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Subchapter 6. Elevator Safety Orders
Article 15. Special Access Lifts
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§3093.25. Material for Sheaves and Drums and Minimum Diameter.

(a) Winding drums, traction sheaves, and overhead and deflecting sheaves shall be of cast iron or steel and of a diameter of not less than 30 times the diameter of the wire suspension means. The rope grooves shall be machined and designed to conform with the requirements of subsection 3038(b).

Exception to subsection 3093.25(a): Where 8 x 19 steel ropes or 7 x 19 aircraft cable are used, the required minimum diameter of drums and sheaves may be reduced to 21 times the diameter of the rope.

(b) The factor of safety, based on the static load (the rated load plus the weight of the car, ropes, counterweights, etc.) to be used in the design of the driving machine and sheaves shall be not less than 8 for wrought iron and steel, and 10 for cast iron, cast steel and other metals.

(Title 24, Part 7, Section 7-3093.25)


Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.


1. New section filed 7-22-86; effective thirtieth day thereafter (Register 86, No. 36).

2. Amendment of section heading filed 8-29-2001; operative 9-28-2001 (Register 2001, No. 35).

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