Fall Protection第 54 / 100 题
How should a straight or extension ladder be positioned against a wall (the 4-to-1 rule)?
a.4 feet out for every 1 foot of height
b.Straight up vertically
c.1 foot out at the base for every 4 feet of working height
d.At a 90-degree angle
解析
The 4-to-1 rule means the base of the ladder should be placed 1 foot away from the wall for every 4 feet of vertical working height. This angle provides stability and reduces the chance of the ladder sliding out. Setting the ladder too steep or too shallow increases fall risk.
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