NCCCO Rigger Level II case studies
NCCCO Rigger Level II · Put your knowledge to work in context.
Rigger Level II is a certification offered within the Rigger program of the National Commission for the Certification of Crane Operators (CCO), a nonprofit organization that describes itself as "Committed to Quality, Integrity, and Fairness in Testing since 1995." CCO lists Rigger alongside Signalperson, Lift Director, and its crane operator and inspector credentials, and administers written exams through several delivery routes: online proctored testing, test center testing, and event online testing. The credential is intended for rigging personnel who work with cranes and other load-handling equipment and who need to demonstrate job-related knowledge rather than only time on the tools. The NCCCO Rigger Level II case studies are 5 cases and about 1,980 words.
1Outrigger Mat and Chart Margin at an Excavation Edge
A 12,000 lb equipment skid must be set 18 ft beyond the edge of a 12 ft deep excavation. The crane is positioned with outriggers on compacted fill; the calculated maximum outrigger reaction is 18,000 lb.
452 words, about 2 min2Four-Leg Bridle with an Offset Center of Gravity
An 8,000 lb asymmetric machine base is to be lifted with a four-leg bridle. Each synthetic sling has a vertical working load limit of 5,000 lb, and the master link is rated 20,000 lb.
364 words, about 2 min3Wire Rope Sling and Hook Deficiencies at the Point of Use
6x37 IWRC wire rope sling returns from a job. The tag is faded and the sling has a tight kink near one eye, two broken wires in one strand within one lay, and light surface rust.
378 words, about 2 min4Tandem Lift with Unequal Load Share
A 36,000 lb vessel is to be tandem-lifted by two crawler cranes. Pick point A is 8 ft from the load CG; pick point B is 12 ft from the CG; the points are 20 ft apart.
386 words, about 2 min5Blind Set with Intermittent Radio and Load Rotation
A 6,000 lb precast panel is being set into a pocket in a wall. The crane operator cannot see the pocket; a signal person is at the wall edge with a clear view.
400 words, about 2 min