Iowa Administrative Code › Agency 875 - Labor Services Division › Elevators, Escalators, and Related Equipment › Chapter 73 - Conveyances Installed Prior to January 1, 1975 › Rule 875-73.22 - Escalators

Current through Register Vol. 47, No. 3, July 24, 2024
(1) Each escalator
				shall be provided with an electrically released mechanically applied brake
				capable of stopping the up and down traveling escalator with any load up to and
				including the rated load. The brake shall be located either on the driving
				machine or on the main drive shaft.
(2) Starting switches shall be of the
				key-operated type. Starting switches shall be located on or near the
				escalator.
(3) Emergency stop
				buttons or other type manually operated switches having red buttons or handles
				shall be accessibly located at or near the bottom and top landings. The buttons
				or levers shall be protected to prevent accidental operation.
(4) A broken step-chain device shall be
				provided on each escalator that will cause interruption of power to the driving
				machine if a step chain breaks or if excessive sag occurs in either step
				chain.
(5) Each escalator shall
				have comb plates at top and bottom landings of the escalator Comb-plate teeth
				shall be meshed with and set into slots in the tread surface of the steps so
				that the points of the teeth are always below the upper surface of the
				treads.
(6) Each escalator
				balustrade or moulding on the balustrade shall have a smooth surface.
				Screwheads shall set flush with the surface or be of the oval head type without
				any burrs or rough places on their surface.
(7) The clearance on either side of the steps
				between the step tread and the adjacent skirt panel shall be not more than 3/16
				inch.
(8) Step treads shall be
				illuminated throughout their run. The light intensity shall be not less than 2
				foot-candles.
(9) An enclosed fused
				disconnect switch or circuit breaker arranged to disconnect the power supply to
				the escalator shall be in each machine room or wherever the controller is
				located.
(10) A stop switch shall
				be provided in each machinery space where means of access to the space is
				provided. The switch when opened shall cause electric power to be removed from
				the escalator driving-machine motor and brake. The switch shall be of the
				manually opened and closed type and shall be marked "STOP".
(11) Hand or finger guards shall be provided
				at the point where the handrail enters the balustrade.
(12) Where the clearance of the upper outside
				edge of the balustrade and a ceiling or scaffold is less than 12 inches or
				where the intersection of the outside balustrade and a ceiling or soffit is
				less than 24 inches from the centerline of the handrail, a solid guard shall be
				provided in the intersection of the angle of the outside balustrade and the
				ceiling or soffit. The vertical front edge of the guard shall project a minimum
				of 14 inches horizontally from the apex of the angle. The escalator side of the
				vertical face of the guard shall be flush with the face of the wellway. The
				exposed edge of the guard shall be rounded.
This rule is intended to implement Iowa Code chapter
				  89A.