§ 33.22. Ladders.
(a) The use of wooden main ladders as a second means of ingress or egress in deep pit or slate quarries is permitted. The ladders shall be constructed in accordance with the following specifications:
(1) Sides, 2 inches by 6 inches oak.
(2) Rungs or steps, 1 1/2 inches by 2 inches oak, notched or mortised full depth into the sides and secured by a 1-inch by 2-inch strip or batten nailed with not less than ten penny nails.
(b) The ladders shall be permanently and substantially secured. Unless the ladder is built in staggered sections of less than 30 feet each, and provided with platforms between each section, all ladders shall be provided with ladder backs or cages of adequate dimensions in accordance with the requirements of Chapter 21 (relating to ladders). Nothing in this subchapter shall be construed to prohibit the erection of stairways provided with landings not more than 30 feet apart.
(c) All ladders, other than the wooden main ladders specified in subsection (a), shall conform in all respects to the requirements of Chapter 21.
(d) All derrick heads and tail sheaves shall be provided with permanent ladders wherever necessary for oiling and making repairs.
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