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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 296-96-11051. What are the construction requirements for steps?
Latest version.
- (1) Measured from the belt to the edge of the step, the minimum depth of a step is 12 inches and the maximum depth is 14 inches.(2) Step width cannot be less than the width of the belt to which it is attached.(3) Measured from the upper surface of one step to the upper surface of the next step above, the distance between steps must be at least 16 feet and the steps must be equally spaced along the belt.(4) A step must be attached to the belt so its surface approximates a right angle with the face of the belt enabling the step to travel in basically a horizontal position with the "up" and "down" path of the belt.(5) The working (upper) surface of a step must be made of either a material having nonslip characteristics (possessing a coefficient of friction of not less than 0.5) or be completely covered with a securely attached nonslip tread.(6) Step supports (frames) and guides must be sufficiently strong to prevent:(a) The disengagement of any step roller;(b) Any appreciable misalignment; or(c) Any visible deformation of the step or its support.(7) Steps must have corresponding handholds.(8) If a step is removed for any reason, the handholds immediately above and below it must be removed before the lift resumes operation.