What is or used as OSHA's definition of an "adequate gripping surface" for a steel fixed ladder side rail? Specifically the cross section shape. I've read OSHA's interpretation letter of August 8, 2005 stating a 2" angle iron isn't considered to meet the requirement. I've also read reference to use ADA as a standard for railing shapes, but no mention of ladder side rails. Would a square HSS 1 3/4 x 1 3/4 be a acceptable shape for side rail? I've seen angles, solid bar and pipe used, but I suspect a square HSS isn't. Thanks for any comments.
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