N.Y. Comp. Codes R. & Regs. tit. 12, § 8-1.47 – Hoistways.

(a) The sides of existing or new hoistways, where there are no landings, shall have enclosures extending from the floor, not less than 72 inches high. Such enclosures shall conform to the specifications of section 8-1.14. A gate shall be provided at the lowest landing. Such gate shall conform to the specifications of section 8-1.22.
(b) In future installations where the platform of a sidewalk elevator travels above the walk, the platform shall have a sheet steel or wood guard that will protect the intervening space between the elevator platform and sidewalk.
(c) The cars of power driven sidewalk elevators hereafter installed shall be provided with a substantial metal bow not less than 72 inches high at center to open sidewalk doors, or with other approved means of automatically raising sidewalk doors; such doors shall be automatic self-closing.
(d) A warning bell or gong shall be provided at the street level for sidewalk elevators and arranged to ring when the elevator is ascending.
(e) In existing and future installations it shall not be permissible to use bars or other means to hold sidewalk doors open when the car is not at street level, unless the top and open ends are protected by a guard of wire mesh or slat construction.
(f) Guide rails.
In future installations, guide rails for both car and counterweight of sidewalk elevators shall be of steel. (See § 8-1.39.) (Sidewalk elevators located inside of building line shall be installed in accordance with freight elevator requirements.)
(g) Machinery.
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.
(h) Hoisting chains or ropes may be used for sidewalk elevators, but the sheaves or drums for the cables on power driven elevators of this type shall be not less than 10 inches in diameter, and the factor of safety for hoist chains and cables and their fastenings shall be not less than six.