Wash. Admin. Code § 296-876-91010 - Design requirements for mobile ladder stands
You must ensure:
(1)
Steps are uniformly spaced and arranged, with a rise of not more than ten
inches (25 cm) and a depth of not less than seven inches (18 cm). The slope of
the step stringer to which the steps are attached must not be more than sixty
degrees, measured from the horizontal.
(2) Mobile ladder stands with a top step
height above ten feet (3 m) have the top step protected on three sides by a
handrail with a vertical height of at least thirty-six inches (91 cm); and top
steps that are twenty inches (51 cm) or more, front to back, have a midrail and
toeboard. Removable gates or nonrigid members, such as chains, may be used
instead of handrails in special-use applications.
(3) The standing area of mobile ladder stands
is within the base frame.
Notes
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