2-6-3 Practical Applications -- Rigging-- Vectors Flashcards
The woriking load limit (wll) of any individual rigging component shall not be exceeded in any situation.
True
The three sags associated with a line conductor are stringing, maximum, and __?__.
Final
Moving a conductor into a conrner causes __?__.
Sag and tension to increase
The formula used to calculate the vertical weight on a structure is __?__.
TxH/L
When pulling in a conductor, line tension __?__ when one-half of the sag is removed.
Doubles
Line tension is normally less than __?__ for an aluminum conductor smallet than 3/0.
500 lbs
Slings used on a 1000-pound transformer at a 60° angle will see __?__ each.
577 lbs
When lifting a conductor, its weight doubles when the lowest point of sag reaches an adjacent structure.
True
The WLL (working load limit) is based on the actual breaking strength of the equipment and does not include a safety factor.
False
Chains that are safe to use as slings when doing line work will have each link marked with the letter __?__.
A
A knot may reduce the WLL of a rope by as much as __?__.
45-55%
A hand line may be used to hang a transformer that weighs 200 pounds or less.
False
Two things that must be known prior to rigging for a lift are the load weight and the __?__.
angle involved
When using a fiber rope, the shell of a block should be __?__ times the diameter of the rope.
8
When using blocks, the load on a pole gin is equal to the weight of the load plus the __?__.
pull on the fall line
An angle of 135° exerts less of a load on a block hook than an angle of 45°
True
A block that can be placed at any point in a line without having to feed the end of the line through it is called a __?__ block.
snatch
Eye splices should have a(n) __?__ to maintain rope strength and reduce wear.
thimble
A __?__ is often called the king of knots for line work.
bowline
When using a capstan hoist to lift a load, the number of turns should be so that about 20 to __?__ of pull are on the fall line.
40 lbs
A rope used for a hand line should have a safety factor of at least __?__.
10 to 1
A web hoist, often called a hot hoist, is considered to be an insulated hoist.
False
When installing U-bolt wire rope clips, the saddle goes on the __?__.
live side
Polypropylene rope is rated poor in its resistance to __?__.
sunlight
