1. (b) The cars of all hand power freight elevators shall be enclosed on other than landing sides, to a height not less than 42 inches.

   Exceptions:

2. (1) Platform or sidewalk elevators. (2) The sides of car where hoistway enclosure extends from floor to ceiling and is flush with hoistway line.
3. (c) The enclosure shall be of wood or metal, solid or open work; if open work is used, the spacing between parallel members shall be not more than one inch.
4. (d) Where wood is used for car enclosure it shall be not less than seven-eighths inch in thickness.

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

(a) Enclosure.

The car and car frames may be of wood, metal, or both wood and metal, and shall be strongly braced and bolted.