1. (a) For existing elevators, the hoistway pit shall have sufficient depth so the car may stop level with the landing at the lowest terminal when descending empty, and shall not strike the bottom of the pit or fully compress the buffer when descending with a full capacity load in the car. The stopping under each condition shall be made automatically.

   Exception:

   Platform elevators and sidewalk elevators.

2. (b) In installations hereafter the pit depth shall be measured from the level of the lowest landing to the bottom of the pit and this distance shall be not less than 30 inches for car speeds not exceeding 75 feet; 36 inches for car speeds exceeding 75 feet and not more than 150 feet; 42 inches for car speeds exceeding 150 feet and not more than 400 feet; and not less than 60 inches for car speeds exceeding 400.
3. (c) In adjacent hoistways there shall be provided a vertical partition or screen separating the hoistways not less than 72 inches high from bottom of pit.

In factory buildings erected before or after October 1, 1913; in mercantile establishments in buildings erected before or after November 1, 1920.