What construction requirements apply to hoistway guide rails?
(1) There must be a minimum of two opposing guide rails extending to a point six inches beyond the full height of travel of the car when the counterweight buffer is fully compressed. (2) All rails must be attached by bolts, lag screws or other approved methods to a vertical supporting member which must not exceed 1/2 inch deflection with the application of a 250 pound horizontal thrust at any point. (3) Wood guide rails must be at least 1 1/2 inch by 1 1/2 inch vertical grain fir or equivalent and must not vary more than 3/16 inch in thickness on the sides which the brakes contact. All joints must be kept smooth and even.
