§ 33.316. Excavations, 10 to 20 feet in depth and more than 42 inches in width.
In all kinds of soil, timber shall be used as follows:
(1) Uprights. Two by 6 inch close sheeting.
(2) Stringers. Six by 6 inch spaced vertically 4 feet apart center line to center line.
(3) Cross braces. Six by 6 inch spaced horizontally 6 feet apart center line to center line.
This section cited in 34 Pa. Code § 33.319 (relating to tables).
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