All gratings or coverings to the openings of any coal or other vault in any sidewalk in the City shall be of iron, and so fastened and secured, by chain and crossbar, that they cannot be opened or misplaced except from the inside. No person, being the tenant or owner of any premises where any such vault is situated shall fail to provide such cover for such opening, or leave such vault open or the cover thereto unfastened, except during the time of actually receiving fuel or other wares therein. (1947 Code §25.13)