High Risk Work Licence - Slewing Mobile Crane C0 (over 100t)
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The C0 Slewing Mobile Crane licence is an Australian high risk work (HRW) competency for operating slewing mobile cranes with a rated capacity over 100 tonnes. It suits experienced crane operators moving up from smaller capacity classes, and people working on major construction, infrastructure, mining, energy and heavy industrial projects where large all-terrain, truck-mounted or crawler-based slewing cranes are used. Assessment combines knowledge questions, a written or calculation component and a practical operational assessment, so you must be able to do the maths and run the machine, not just recall facts.
The knowledge assessment samples across ten domains: legislation and duty of care, hazard identification and risk control, crane types and load charts, rigging and load estimation, site preparation and ground conditions, lift planning including multi-crane and critical lifts, communication and coordination, inspection and defect reporting, emergency response, and safe shutdown. Load charts, ground bearing and lift planning carry the most weight, and these are where most marks are won or lost.
Prepare by working through the load chart for the crane you operate until reading capacities, radii, boom configurations and deductions becomes automatic, then practise planning real lifts end to end: mass estimation, sling angles, outrigger loading, exclusion zones, rigging selection and a written lift plan. Build familiarity with the WHS Act and Regulations and the relevant HRW and crane safety guidance, and rehearse practical routines with a competent assessor or trainer. The regulator publishes current assessment and licensing requirements, so confirm details with your jurisdiction's WHS authority before booking.
What you'll study
About High Risk Work Licence - Slewing Mobile Crane C0 (over 100t) preparation
What does the C0 licence actually let me operate?
It covers slewing mobile cranes with a rated capacity over 100 tonnes. Because capacity classes are separate, confirm with your regulator which specific crane types and configurations fall inside C0 and whether any endorsements or additional classes are needed for the plant on your site.
How is the assessment structured?
Typically a knowledge test, a written or calculation component covering load charts and lift planning, and a practical assessment where you plan and perform lifts. The regulator sets the current structure, so check its published assessment requirements rather than relying on secondhand descriptions.
How long is the exam and how many questions are there?
Those figures are set by the regulator and change over time, so they are not fixed here. Your jurisdiction's WHS authority publishes the current assessment instruments, question counts and time allowances on its website, and your training provider can confirm what applies to your booking.
What score do I need to pass?
Passing requirements are set by the regulator and the assessing body, and they differ between the knowledge and practical components. Check the current published requirements with your WHS authority or registered training provider before you sit the assessment.
How hard is it compared with smaller crane classes?
The practical operation is similar, but the planning burden is much higher. Large cranes have complex chart configurations, significant deductions for jibs and attachments, heavy outrigger loads and longer set-up times, so weak load chart skills and poor lift planning are the usual reasons candidates struggle.
What if I fail a component?
Retake and reassessment arrangements are set by the regulator and your provider, including any waiting periods and fees. Ask your provider about the process before assessment day, and treat a failed calculation section as a signal to rebuild chart-reading skills rather than to rebook immediately.
What should I study first?
Start with load charts and load estimation, because they underpin lift planning, rigging selection and set-up decisions. Then layer in ground conditions and outrigger loading, followed by legislation, hazard control, communication and emergency procedures, which are easier to absorb once the technical fundamentals are solid.
What are the most common failure points?
Misreading chart configurations, forgetting deductions for jibs, hook blocks and rigging, underestimating load mass, and ignoring ground bearing or outrigger load limits. In the practical, candidates lose marks for poor exclusion zones, unclear communication and skipping pre-operational inspections or shutdown checks.
Can I use my own crane for the practical?
That depends on the assessing body and the plant available at the assessment site. Some providers supply suitable cranes; others require access to one. Confirm the arrangement, the crane's capacity class and any site access requirements with your provider when you book.
How long is the licence valid and what does it cost?
Validity periods and fees are set by each jurisdiction and are updated periodically, so they are not stated here. Your WHS authority's licensing page lists the current fee schedule, application process and renewal requirements, including any photo and identity evidence needed.