NCCCO Load Charts and Capacity Calculations 2

Question 1

A crane load chart shows a rated capacity of 42,000 lbs at a 30-foot radius with a 60-foot boom.
The rigging hardware (hook block, slings, and shackles) weighs 800 lbs.
What is the maximum net load that can be safely lifted?

Accepted Answer

41,200 lbs

Answer

42,800 lbs

Answer

42,000 lbs

Answer

40,400 lbs

Question 2

What does a dagger symbol (†) or asterisk (*) next to a rated capacity in a load chart typically indicate?

Accepted Answer

A footnote that imposes an additional condition or restriction on that capacity value

Answer

The capacity applies only during nighttime operations

Answer

The capacity is applicable only for rooster sheave configurations

Answer

That value is not valid and should be disregarded

Question 3

When planning a lift with a telescoping boom crane, why is it important to know the boom's actual extended length?

Accepted Answer

Boom length determines which column in the load chart provides the applicable rated capacities

Answer

Longer booms require more warm-up time before lifting begins

Answer

Longer booms always have higher capacity than shorter booms at the same radius

Answer

Boom length affects only the maximum hook height, not the rated capacity

Question 4

A crane is set up with outriggers partially extended. Which load chart table should the operator use?

Accepted Answer

The table specifically showing the actual partial extension percentage used

Answer

The fully extended outrigger table, since it gives the most conservative (lowest) capacities

Answer

The on-rubber table, since partial extension is not fully supported

Answer

The operator may choose whichever table gives the most convenient capacity for the planned lift

Question 5

What is 'chart capacity' versus 'structural capacity' in crane load chart terminology?

Accepted Answer

Chart capacity is the lower of structural limit and stability limit; structural capacity is the limit based on crane structure strength alone

Answer

Chart capacity is for concrete structures; structural capacity is for steel structures

Answer

Structural capacity is always higher than chart capacity due to safety factors applied

Answer

These terms are interchangeable and mean the same thing in modern load charts

Question 6

If a load chart shows 'N/A' or a blank cell for a specific radius and boom length combination, what does this mean for the operator?

Accepted Answer

That combination is not permitted; the crane must not be operated at that radius with that boom length

Answer

The crane can lift any load at that combination since no restriction is shown

Answer

N/A means the capacity is the same as the nearest listed value in the chart

Answer

The operator should use the average of adjacent cells to estimate the capacity