All ledges, floor beams, sills, saddles and timbers on landing sides that project more than one inch from the inside of the hoistway enclosure shall be fitted with smooth, beveled guards set directly under the projections. The slope of the guard shall be at least 60 degrees from the horizontal, and shall extend to a point where the bevel meets the vertical wall.

Windows, recesses, or offsets in enclosure walls of hoistway on open sides of the car except door lintels shall be protected by curtain walls, grating or vertical bars, set flush with the hoistway line, the distance between members not to exceed two inches. Such grating or bars shall be of metal. No point of such curtain walls, grating or bars shall be more than three inches from the car platform on any open side of the car.

In installations hereafter made the clearance between the edge of the car platform and edge of any landing sill or the edge of any door when used as a landing sill shall be not greater than one and one-quarter inches and the minimum clearance shall be not less than three-quarters of an inch. In cases where an entrance is provided in exterior wall of building and such wall has offsets at various levels, this clearance shall be maintained between edge of car platform and the protection prescribed in subdivision (b) of this section.