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The safest angle for a ladder is 75.5°; if it is too shallow, the bottom of the ladder is at risk of sliding, and if it is too steep, the ladder may fall backwards. This angle is achieved by following the 4 to 1 rule for a ladder placed on a vertical wall: for every four feet of vertical height, the ladder foot should move one foot from the wall.
English: Safe setup of a leaning ladder: “The safest angle for a ladder is 75.5°”. Date: 17 February 2017: Source: La-main.gif ...
Cages: Cages are optional for fixed ladders with a floor to floor elevation of less than 20' (6100 mm). They are often available for ladders with elevation changes down to 11' (3350 mm). Cages are mandated to begin between 7' and 8'(2250 mm) from the ground and extend the entire length of the ladder.
Grab bars in industry and construction are found on equipment or above fixed ladders where footholds exist but other handholds are lacking. They may be positioned horizontally, vertically, or at an angle. When using grab bars as safety devices in order to prevent falls, your best choice would be a horizontal bar.
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If the V-angle is greater than 120 degrees, the load on each individual anchor will be greater than the load on the rope. Angles in excess of 120 degrees can create a hazardous situation that compromises the safety of the anchor, and should generally be avoided.
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