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4.3.18 Guide Rails and Fastenings
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4.3.18.1 Material and Finish
Car and counterweights shall be provided with guide rails of steel or straight-grained seasoned wood free of knots, shakes, dry rot, and other imperfections.
Guide rails for sidewalk elevators shall be steel. The guiding surfaces of the guide rails for elevators equipped with car safeties shall be finished smooth.
4.3.18.2 Strength of Rails and Fastenings
Guide rails shall be securely fastened with through bolts or clips of such strength, design, and spacing that
(a) the guide rails and their fastenings shall not deflect more than 6 mm (0.25 in.) under normal operation
(b) the guide rails and their fastenings shall withstand the application of the safety, where provided, when stopping the car with rated load or when stopping the counterweight
4.3.18.3 Extension of Guide Rails at Top and Bottom of Hoistway
Car and counterweight guide rails shall rest on suitable supports and extend at the top of the hoistway sufficiently to prevent the guide shoes from running off the guide rails in case the car or counterweight travels beyond the terminal landings.
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