NCCCO Mobile Crane Core Exam Guide: Format, Cost, Domains and the OSHA 1926 Subpart CC Rules It Tests
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The NCCCO Mobile Crane Core exam is the written test every CCO mobile crane operator must pass, and much of it rests on OSHA's crane rule, 29 CFR 1926 Subpart CC. This guide covers the exam format, fees, retake and recertification rules, the four domains and their weights, the OSHA numbers that show up again and again, state licensing differences, and a four-week study plan.
NCCCO Mobile Crane Core Exam at a Glance
| Item | CCO Mobile Crane Operator |
|---|---|
| Core written exam | 95 multiple-choice questions in 90 minutes |
| Specialty written exams | 26 questions in 60 minutes each: Lattice Boom (LAT), Telescopic Swing Cab (TLL), Telescopic Fixed Cab (TSS) |
| Practical exam | One per crane type you want on your card |
| Fees (from Jan 1, 2024) | Core $140. Specialty $80 each. Practical $70 each. |
| Minimum age | 18 |
| Time limit to finish | 12 months from your first passed exam |
| Retake wait | Four weeks for the same exam, unless an alternate form exists |
| Valid for | Five years |
Sources: the CCO Mobile Crane Operator overview and the CCO exam fee schedule. NCCCO's pages do not publish a single pass percentage, so we do not quote one.
How CCO Mobile Crane Certification Works
To be certified you pass three things: the Core written exam, at least one Specialty written exam, and the practical exam for that same crane type. You can take them in any order. The clock starts when you pass your first one. From then you have 12 months to pass the matching written or practical exams in that designation. NCCCO gives an example: if your Core pass is older than 12 months by the time you pass the Specialty, you have to take the Core again.
You can sit the written exams three ways: Online Proctored Testing (OPT) on your own computer with a webcam and microphone, Test Center Testing (TCT) at a network of nearly 600 centres, or Event Online Testing (EOT). Preliminary scores appear right away on all three. With OPT and TCT you can reschedule or cancel at no cost up to 48 hours before your appointment. You must bring a valid government photo ID. A letter-size whiteboard is allowed in place of scratch paper.
What the NCCCO Core Exam Covers: Four Domains
The official Core Exam Outline splits the test into four domains. On a 95-question exam those weights work out to roughly the counts shown, which is our arithmetic, not an NCCCO number.
| Domain | Weight | About how many questions | Typical topics |
|---|---|---|---|
| 1. Site | About 20% | 19 | Ground stability, mats and cribbing, power lines during assembly, travel without load, the controlling entity's duties |
| 2. Operations | About 26% | 25 | Inspection, levelling, radius, signals, personnel platforms, multi-crane lifts, operator aids, emergencies, dynamic and side loading |
| 3. Technical Knowledge | About 28% | 27 | ASME B30.5 and B30.10, OSHA 1910.180 and 1926 Subpart CC, inspections, wire rope, rigging, fall protection |
| 4. Load Charts | About 26% | 25 | Chart terms, choosing the right chart, stability vs. structural limits, range diagram, work area chart, parts of line |
The load chart domain says you must "demonstrate basic math skills without the use of a calculator." NCCCO's calculator FAQ explains why: a study it commissioned found calculators were not appropriate for the basic math on Core exams, but were supportable for load chart calculations on Specialty exams. So practise percentages, deductions and simple multiplication by hand.
OSHA 1926 Subpart CC Numbers Every Core Candidate Should Know
Technical Knowledge names 29 CFR 1926 Subpart CC directly, and the Site and Operations domains lean on it too. These are the figures our question bank tests most, each quoted from the eCFR text:
| Topic | Rule | Section |
|---|---|---|
| Power line check distance | Plan if any part could get closer than 20 feet | 1926.1407 and 1926.1408 |
| Table A clearances | Up to 50 kV: 10 ft. Over 50 to 200 kV: 15 ft. Over 200 to 350 kV: 20 ft. Over 350 to 500 kV: 25 ft. Over 500 to 750 kV: 35 ft. Over 750 to 1,000 kV: 45 ft. | 1926.1408 |
| Voltage information | Utility must answer within two working days | 1926.1408(c) |
| Monthly inspection record | Keep at least three months | 1926.1412(e) |
| Annual inspection | At least every 12 months, by a qualified person | 1926.1412(f) |
| Wire rope, running rope | Six broken wires in one lay, or three in one strand in one lay | 1926.1413 |
| Diameter loss | More than 5% from nominal | 1926.1413 |
| Drum wraps | Never fewer than two full wraps | 1926.1417(t) |
| Operational aid repair | Category I: 7 days. Category II: 30 days. | 1926.1416 |
| Verify load weight | If the LMI reads over 75% of max capacity at the longest radius | 1926.1417(o) |
| Brake test | Loads of 90% or more of maximum line pull | 1926.1417(s) |
| Personnel lifts | Level within 1%. Total load no more than 50% of rated capacity. Proof test at 125% for 5 minutes. Wind over 20 mph needs a qualified person's call. | 1926.1431 |
Two rules catch people out. Required safety devices under 1926.1415, such as the level indicator and horn, allow no alternative measures. If one fails, the crane is out of service. Operational aids under 1926.1416, such as the anti two-block device, do allow temporary alternatives while they are repaired. And under 1926.1418, the operator always has authority to stop and refuse to handle a load when safety is in doubt.
Is the NCCCO Core Exam Hard?
Most candidates find the load chart domain the hardest, because it is a quarter of the exam and you work without a calculator. The second trap is the gap between field habit and the written rule. A question will ask what OSHA requires, not what your last site did. NCCCO does not publish pass rates on its Mobile Crane pages, though its retake FAQ says most candidates pass at the first attempt. Don't trust any pass rate you see quoted without a source.
Where candidates usually lose marks:
- Power line distances. Know the 20-foot trigger, the Table A bands, and the rule that lines are presumed energized and uninsulated.
- Who does what. Competent person, qualified person, controlling entity, A/D director and lift director each have defined duties.
- Signals. Voice signals follow the order function, direction, then distance and/or speed. Directions are given from the operator's perspective.
- Percentages. 50%, 75%, 90% and 125% each attach to a different rule.
State and City Differences in Crane Operator Licensing
CCO certification is national, but some places add a licence on top. NCCCO's state and city licensing page says 16 states and 7 cities currently license crane operators. The states it lists are California, Connecticut, Hawaii, Maryland, Massachusetts, Minnesota, Montana, Nevada, New Jersey, New Mexico, New York, Pennsylvania, Rhode Island, Utah, Washington and West Virginia. The cities are Chicago, Cincinnati, New Orleans, New York City, Omaha, Philadelphia and Washington, DC. Many of them require or recognise CCO certification. OSHA 1926.1427(c) says that where a state or local government licenses operators, you must hold that licence to work in its jurisdiction. Check the local authority before you book.
NCCCO Mobile Crane Core Study Plan: 4 Weeks
- Week 1: Site and power lines. Read 1926.1402, 1926.1404 and 1926.1407 to 1926.1411. Memorise Table A and the encroachment measures.
- Week 2: Operations and signals. Read 1926.1417 to 1926.1426 and 1926.1431 to 1926.1432. Practise voice signal order and the fall-zone rules.
- Week 3: Technical knowledge. Read 1926.1412 to 1926.1416 and 1926.1427. Learn the wire rope removal criteria by category, and the difference between safety devices and operational aids. Read ASME B30.5 if your course provides it.
- Week 4: Load charts and timed practice. Do hand-math drills on manufacturer charts from your training course. Then take our NCCCO practice test and a timed 95-question mock exam, and review each miss against its quoted source.
Retakes and Recertification
If you fail, the CCO retake policy makes you wait four weeks to retake the same exam. If an alternate form exists, you can retest sooner. The wait does not apply to practical exams. Certification lasts five years, and the recertification page says you must meet all requirements in the 12 months before it expires. You retake the same written exams as first-time candidates. You can skip the practical if you can attest to at least 1,000 hours of crane-related experience. There is no grace period. If your card lapses, you take both the written and practical exams again.
How Our NCCCO Practice Questions Are Built
Our 177 questions quote the official text behind each answer. Most come from the eCFR text of 29 CFR 1926 Subpart CC, and the rest from NCCCO's own program pages. A handful of load-chart-style items use OSHA's percentage rules for hand arithmetic. We do not reproduce NCCCO's private item bank, ASME B30.5 or any manufacturer load chart, so pair this bank with the charts from your training course. For related safety exams, see our OSHA 30 guide.
Frequently Asked Questions
How many questions are on the NCCCO Mobile Crane Core exam?
NCCCO says the Core Examination has 95 multiple-choice questions, and you get 90 minutes. Each Specialty exam (LAT, TLL or TSS) adds 26 questions in 60 minutes.
What score do I need to pass the NCCCO Core exam?
NCCCO does not publish a single fixed percentage on its Mobile Crane Operator pages. Treat 70% on our mock as a practice target, not the official cut score, and check your Candidate Handbook for current scoring details.
How much does the NCCCO Mobile Crane exam cost?
Under the CCO fee schedule effective January 1, 2024, the Core exam is $140. Each Mobile Crane Specialty written exam is $80, and each Mobile Crane practical exam fee is listed at $70. Practical test sites may charge their own crane and site fees.
Is the NCCCO Core exam open book?
No. NCCCO's written exam FAQ says you may not bring books, manuals, notepads, scratch paper, calculators or phones into the exam. Load charts and on-screen tools are provided inside the exam where needed.
Can I use a calculator on the Core exam?
NCCCO's outline asks for basic math without a calculator on the Core load chart domain. Its calculator FAQ explains that calculators are supported for load chart calculations on Specialty exams, and they appear on-screen. You cannot use your own.
What happens if I fail?
You get a strength-and-weakness report. NCCCO's retake policy says you must wait four weeks to retake the same written exam, unless an alternate form of that exam is available.
How long does CCO certification last?
Five years. You must recertify in the 12 months before it expires. If you can attest to at least 1,000 hours of crane-related experience, you do not need to retake the practical exam.
Do I need the Core exam if I only run one type of crane?
Yes. Every candidate takes the Core plus at least one Specialty, and must pass the matching practical within 12 months of passing the first exam.
Does OSHA require crane operator certification?
Yes, for most construction cranes. 29 CFR 1926.1427 requires the employer to make sure each operator is trained, certified or licensed, and evaluated. Certification must come from an accredited testing organization, and the employer pays for it.
Which states license crane operators?
NCCCO lists 16 states and 7 cities with crane operator licensing, including California, New York, Washington, Chicago and New York City. Where a state or city licence applies, OSHA requires that licence.
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