Fall Protection第 55 / 100 题
How far above a landing must an extension ladder extend for safe access?
a.It should stop below the landing
b.At least 3 feet above the landing surface
c.Exactly at the landing edge
d.10 feet above
解析
A ladder used to access an upper landing must extend at least 3 feet above the landing surface. This gives the worker something to hold while stepping on and off. If it cannot extend, a grab rail must be provided.
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