Sec. 8-1.28. Machinery

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In factory buildings erected before or after October 1, 1913; in mercantile establishments in buildings erected before or after November 1, 1920.
(a) The elevator machinery and sheaves shall have an ample factor of safety for the rated elevator capacity and shall be installed in a substantial manner.
(b) Belted, chain driven elevators and spur gear machines.
(1) In future installations single belted or chain driven elevators shall not be permitted.
(2) In future installations double belted driven elevators shall be permitted only when the drive is from a line shafting, which also supplies power for other purposes and where the car speed does not exceed 60 feet per minute.
(3) In future installations spur gear machines shall not be permitted.
Exceptions:
(1) Machines that have an intervening worm and gear between the spur gear and brake. (2) Spur gears may be installed on worm gearing machines between the motor and brakes. (For sheaves and drum diameters see subdivision [i] of section 8-1.45.)

                    
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