6/7 Ladders and Evolutions Flashcards
Base, true : Indicated only by the ____ on straight ladders which will be under the rungs of a raised ladder when the true base is down.
tie-rods
Moving Pivot : base member spans pivot beam at approximately ____ level and opposite beam at approximately ____ level.
3rd rung / 5th rung
Extension ladders =
12 / 14/ 20 / 35
Straight ladders =
16 / 20 / 24
Roof ladders =
10 / 12 / 14 / 16 / 20
Collapsible ladder =
10
Members on ladders
10/ 12/ 14/ 16
One member
Members on ladders
20 and 24
Two members
Members on ladders
35
Three members
Roof ladder : members on ladders
10/ 12/ 14’
Two members
Roof ladder : members on ladders
16 / 20’
Three members
Pigmented paints shall not be used on ladders except on ____ and for ___
metal parts / marking
The proper climbing angle of a ladder is approximately ____.
70 degrees
To obtain this angle, the base of the ladder should be placed at a distance from the building or objective equal to approximately ____ the desired height.
1/4
The 20-foot straight ladder can sometimes he used to reach the ______.
lowest fire escape balcony
Twenty-four foot straight ladders are used for reaching roofs of _____, windows on ____, fire escape balconies, etc.
one-story buildings / second floors
Extension ladders should normally be extended ____ windowsills or fire escape balcony railing, and a MINIMUM of _____ or more above parapet walls, roofs, etc.
one foot above / three feet
Raising 16 and 20 roof ladder :
Top member climbs ground ladder and places arm between_____ rungs of roof ladder. Base member climbs ground ladder until his/her head is even with _____ below feet of top member, places arm between ______ of roof ladder.
second and third / second rung / convenient rungs
