Falls from Ladders
Ladders may be fixed or portable. They may be straight- extension- or step-ladders and may be manufactured from wood, metal, plastic, or fiberglass. They can be light-, medium-, heavy-, or extra-heavy-duty.
They can be two feet high (step-stools), 18 feet for extra-heavy-duty step-ladders, and 40 feet or longer for extension-type ladders.
The materials from which ladders are constructed have advantages and disadvantages in weight, durability, flexibility, conductivity, and strength. The intended use of the ladder should determine the type purchased, and only American National Standards Institute (ANSI) approved ladders should be used. One major caution is that metal ladders should never be used in locations in which the ladder or its user could come into contact with electricity.
A ladder should be long enough so that when it rests against the upper support the user can work with waist no higher than the top rung of the ladder or above the rung at which the siderails are resting against the upper support. This means that the top three rungs of a straight ladder, or the top two steps of a step-ladder, should never be used for the feet.
The lower ends of the siderails should be equipped with slip-resistant pads, particularly if the ladder is to be used on hard surfaces. The same is true for the upper ends of the siderails if they are to rest against a surface.
Ladders should be set at, or as near, a 4:1 angle as possible. That is, for each three or four feet of rise from the base to the upper resting edge of the ladder, the base should be one foot out from a vertical line from the upper resting edge of the ladder to the working surface. As an example, if a ladder is leaning against a ledge that 20 feet off the ground, the base of the ladder should be five feet back from the Preventing Injuries from Slips, Trips, and Falls 4 wall. The base of the ladder must be firmly set so that there is no possibility of slippage or settling into soft ground. The resting edge of the ladder should have both siderails in contact with the object (building or tree) it is against. When setting a ladder against a tree, set the ladder in the crotch of two limbs so that it cannot slide in either direction. Whenever there is any question as to the stability of the ladder, additional effort should be made to stabilize the ladder as it is being climbed. Tying the top of the ladder to
the supporting structure can also keep the ladder from slipping or sliding.
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