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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 296-96-07070. What are the requirements for machinery beams and supports?
Latest version.
- (1) All machinery and sheaves must be sufficiently secured and supported to prevent any part from becoming loose or displaced. Beams directly supporting machinery must be made of steel, sound timber or reinforced concrete.(2) Beams and support loads must be computed as follows:(a) The total load on the beams must be equal to the weight of all apparatus resting on the beams plus twice the maximum load suspended from the beams.(b) The load resting on the beams must include the complete weights of the driving machine, sheaves, controller, etc.(c) The load suspended from the beams must include the sum of the tensions in all ropes suspended from the beams.(3) The elevator driving machine or sheaves must not be fastened to the underside of the supporting beams at the top of the hoistway. EXCEPTION: Cast iron in tension must not be used for supporting members for idler and deflecting sheaves where hung beneath beams.(4) The factor of safety for beams and supports must be no less than:(a) Five for steel; and(b) Six for timber and reinforced concrete.