You must fully enclose hoistways or make sure they are enclosed on all landings to a height of six feet above the landing floor or six feet above highest working level or stair level adjacent to the hoistway. Perforated hoistway enclosures can be used where fire resistance is not required, provided:

(1) Steel wire grill or expanded metal grill must be at least thirteen U.S. gauge steel wire.

(2) Openings in the enclosure must reject a one inch steel ball.

(3) All hoistway landings must be properly and adequately lighted.