29.—(1) Subject to the provisions of paragraph (2) of this Regulation, parts of staging, tools and other articles and materials shall not be thrown down from a height where they are liable to cause injury to persons employed, but shall be properly lowered.
(2) When the work to be done necessarily involves the throwing down from a height of articles or materials, conspicuous notices shall be posted to warn persons from working or passing underneath the place from which articles or materials may fall, or the work shall be done under the direct supervision of a competent person in authority.
(3) No person employed shall throw down any articles or materials from a height except in accordance with the requirements of this Regulation.