R 408.14443 Cupolas.

Rule 4443. (1) A skip hoist oR charging machine, unless completely enclosed, shall be equipped with: (a) A warning device to announce movement. (b) An interlocking gate across the bucket loading opening. (2) An employee working in a cupola shall be protected from falling objects by an overhead guard. (3) A cupola bottom shall be: (a) Supported by 2 or more metal props of structural strength with overall safety factor of not less than 10 to support a full capacity load and adjusted to proper height by wedges or screw jacks. (b) Dropped only after a general warning has been sounded and all persons are removed to a safe distance oR protected by a permanent or movable enclosure or screen. (c) Dropped into an area free of water. (4) A slag hole shall be shielded to protect an employee from spattering slag. (5) Where oxygen is used to blow or cut tapping holes, a screen or guard shall be used to protect nearby employees from hot blown material. (6) An employee not wearing light attenuating goggles oR shields shall be protected by a screen or wall from the arc of an electric furnace.