- AZ-EC is the site identifier for Arizona's C-11 (CR-11) Electrical (Commercial) trade exam, administered through PSI Services LLC for the Arizona Registrar of...
- The trade exam has 110 scored questions in 240 minutes, plus up to 10 unscored experimental items, with 70% needed to pass.
- Trade exam fee is $66; the separate Statutes and Rules Exam costs $61 through the ROC.
- Service Feeders and Branch Circuits, Grounding and Bonding, and Special Occupancies and Equipment tie as the largest domains at 13 items each.
What AZ-EC Actually Refers To
On this site, AZ-EC is shorthand for the Arizona C-11 (CR-11) Electrical (Commercial) trade examination - the state-specific test that qualifying parties must pass to hold a commercial electrical contractor's license in Arizona. It is not the R-11 residential outline, and it is not the NASCLA commercial electrical alternative examination that some other states accept. AZ-EC on this site always means the Arizona-specific C-11/CR-11 commercial trade exam pathway administered by PSI on behalf of the Arizona Registrar of Contractors (ROC).
If you've landed here searching for background on this credential, this page is the starting point. For a deeper breakdown of every tested topic, see the AZ-EC Exam Domains 2026: Complete Guide to All 15 Content Areas, and if you want a structured prep plan, the AZ-EC Study Guide 2026 walks through a first-attempt strategy.
Who Administers the Exam
The Arizona Registrar of Contractors sets the licensing requirements for contractors, while the actual trade knowledge exam is delivered through PSI Services LLC, a third-party testing vendor. PSI publishes the official candidate bulletin that governs test-day rules, content outline, and permitted references. The general bulletin referenced for this content area is dated February 18, 2026, and the commercial trade outline itself was last revised June 8, 2023 - so the underlying content weighting has been stable while administrative details are refreshed periodically.
Because ROC and PSI split responsibilities, candidates end up dealing with two separate processes: the ROC handles contractor licensing, application, bonding, and insurance requirements, while PSI handles exam scheduling, delivery, and scoring. Understanding this split helps explain why there are two separate exam fees and two separate score reports involved in becoming licensed.
Exam Format and Question Style
The AZ-EC trade exam is a computer-based, multiple-choice test. Candidates can sit for it at a physical PSI test center or through remote proctoring, depending on availability and preference. Key format facts:
- 110 scored questions drawn from the official content outline
- 240 minutes total testing time
- 70% required to pass
- PSI may insert 5 to 10 unscored experimental questions mixed into the exam without adding extra time - these look identical to scored items, so there's no way to identify or skip them
Because experimental items are invisible to the candidate, effective time management assumes all 110-120 questions matter equally. For a detailed discussion of what "hard" means in the context of this specific exam's blueprint and time pressure, see How Hard Is the AZ-EC Exam? Complete Difficulty Guide 2026. For the exact scoring mechanics, the AZ-EC Passing Score 2026 guide breaks down what 70% actually requires in raw question counts.
Key Takeaway
Budget roughly two minutes per question across the full 240-minute window, and don't try to guess which items are unscored experimental questions - treat every question as if it counts.
The 15 Content Domains
PSI's outline for the C-11 (CR-11) commercial trade exam divides the 110 scored questions across fifteen domains. The official item allocation, in domain order, is: 5, 13, 13, 12, 10, 13, 2, 5, 5, 3, 1, 5, 5, 8, 10 - totaling 110 items.
| Domain | Approx. Items |
|---|---|
| 1. General Electrical Knowledge | 5 |
| 2. Service Feeders and Branch Circuits | 13 |
| 3. Grounding and Bonding | 13 |
| 4. Conductors and Cables | 12 |
| 5. Raceways and Boxes | 10 |
| 6. Special Occupancies and Equipment | 13 |
| 7. Devices | 2 |
| 8. Motors | 5 |
| 9. Low Voltage | 5 |
| 10. Lighting | 3 |
| 11. Illuminated Signs | 1 |
| 12. Fire Detection and Alarm Systems | 5 |
| 13. Safety | 5 |
| 14. Overcurrent Protection | 8 |
| 15. Photovoltaics | 10 |
Service Feeders and Branch Circuits, Grounding and Bonding, and Special Occupancies and Equipment tie as the largest domains at 13 items each - together they make up roughly a third of the entire exam. Conductors and Cables and Photovoltaics follow closely at 12 and 10 items respectively.
Service Feeders and Branch Circuits
Candidates must understand sizing, calculations, and layout rules for service equipment and branch circuits in commercial settings.
- Load calculation methodology
- Feeder and branch circuit conductor sizing
- Service equipment requirements
Grounding and Bonding
This domain covers the grounding electrode system, bonding of equipment and enclosures, and separately derived systems common on commercial jobs.
- Grounding electrode conductor sizing
- Equipment bonding jumpers
- Separately derived system grounding
Special Occupancies and Equipment
Special occupancies (hazardous locations, health care facilities, and similar) combined with specific equipment rules make this one of the exam's heaviest domains.
- Hazardous location classifications
- Health care facility wiring requirements
- Equipment-specific installation rules
Because domain weight isn't evenly distributed, it doesn't make sense to study every domain for the same number of hours. The AZ-EC Exam Domains 2026 guide goes topic-by-topic through all fifteen areas with more granular study priorities.
Registration, Fees, and Eligibility
The AZ-EC trade exam carries a $66 fee. Separately, candidates must also pass the ROC's Statutes and Rules Exam, which costs $61 and is processed through the ROC's online system rather than at PSI's trade-testing counter. These are two distinct exams with two distinct fees - don't confuse the combined cost with the trade exam fee alone. A full cost breakdown, including how these fees fit into total licensing expenses, is available in AZ-EC Certification Cost 2026: Complete Pricing Breakdown.
On the eligibility side, the qualifying party for a C-11 (CR-11) license ordinarily needs four years of practical or management trade experience, with at least two of those years falling within the preceding ten years. Qualifying education or manufacturer training can offset up to two years of that experience requirement. Beyond experience, ROC applications also require:
- A completed contractor license application
- Business entity documentation
- Background check clearance
- An active bond
- Proof of insurance
Because these requirements involve more than just passing a test, it's worth reviewing them in full before scheduling anything. The AZ-EC Requirements 2026 page lays out eligibility and prerequisites in more detail.
Open-Book References and Testing Rules
Unlike a closed-book knowledge test, the AZ-EC trade exam is open-book, but only with approved references:
- The 2017 National Electrical Code
- NFPA 72 National Fire Alarm Code, 2016 edition
- The specified 29 CFR 1926 OSHA reference
Candidates are allowed to bring these approved books with pre-existing highlighting, underlining, annotations, and permanent tabs. What's not allowed: adding loose papers, or writing in the books during the actual exam session. A basic non-scientific, non-programmable calculator that meets PSI's device rules is permitted as well.
Remote proctoring adds its own restrictions - no breaks during the session and no scratch paper, which makes calculation-heavy domains like Service Feeders and Branch Circuits or Overcurrent Protection noticeably more demanding when testing remotely versus at a physical test center.
Retakes, Deadlines, and Licensing
If a candidate doesn't pass on the first attempt, the waiting period before retaking is 30 days. After a third failed attempt, that waiting period extends to 90 days for any subsequent attempts. This structure rewards focused reattempt preparation rather than repeated quick retries.
Once a candidate passes, the clock starts on a separate deadline: a qualifying passing score must be applied to an actual license application within two years. Let that window lapse, and the passing score no longer counts toward licensure - meaning the exam would need to be retaken.
After licensure, Arizona contractor licenses operate on a two-year renewal cycle, requiring a renewal filing, the applicable fee, and a maintained bond to stay active. None of this replaces the initial exam, but it's part of the full lifecycle worth understanding before committing time to exam prep. For context on whether the full time and cost investment pays off, see Is the AZ-EC Certification Worth It? Complete ROI Analysis 2026.
Who Takes the AZ-EC Exam
The AZ-EC trade exam is specifically for individuals seeking to qualify as the qualifying party on a C-11 (CR-11) commercial electrical contracting license in Arizona. This typically includes experienced electricians moving into a contractor or supervisory role, business owners who need a licensed qualifying party, and tradespeople transitioning from working under someone else's license to holding their own.
Because the license is tied to commercial work specifically - not residential (R-11) - the tested content leans toward commercial-scale installations: larger service equipment, special occupancy rules, health care and hazardous location wiring, and systems like fire alarms and photovoltaics that show up more often on commercial projects. If you're weighing career direction after certification, AZ-EC Jobs covers the kind of roles this license typically opens up, and AZ-EC Salary Guide 2026 discusses earnings considerations for licensed commercial electrical contractors in Arizona.
Preparing for AZ-EC Efficiently
A generic study calendar won't map well onto an exam with this specific domain weighting. Instead, sequence your prep around item counts: spend the earliest, highest-focus weeks on the three tied-largest domains (Service Feeders and Branch Circuits, Grounding and Bonding, Special Occupancies and Equipment), then move to Conductors and Cables and Photovoltaics, and finish with lighter-weighted domains like Devices, Illuminated Signs, and Lighting, which combined account for only a handful of questions.
High-Weight Domains
- Service Feeders and Branch Circuits calculations
- Grounding and Bonding electrode and bonding rules
- Special Occupancies and Equipment classifications
Mid-Weight Domains
- Conductors and Cables sizing and ampacity
- Photovoltaics system requirements
- Raceways and Boxes fill calculations
Remaining Domains + Practice
- Overcurrent Protection, Fire Detection and Alarm Systems, Safety, Motors, Low Voltage
- Lighter domains: Devices, Lighting, Illuminated Signs, General Electrical Knowledge
- Timed full-length practice runs
Whatever schedule you build, running full-length timed practice questions under exam-like conditions is the closest way to simulate the 240-minute pressure and the open-book reference lookups you'll actually do on test day. You can start practicing directly on the AZ-EC Exam Prep practice test platform to get comfortable with the question style before your scheduled date. If you want the data-driven view on why certain domains deserve more attention, AZ-EC Pass Rate 2026: What the Data Shows and AZ-EC Cheat Sheet 2026 are useful companion resources, and AZ-EC Exam Dates 2026 covers scheduling logistics once you're ready to book a session.
Frequently Asked Questions
No. AZ-EC on this site refers specifically to the C-11 (CR-11) Electrical (Commercial) trade exam, which is distinct from the R-11 residential outline and from the NASCLA commercial electrical alternative examination.
The exam has 110 scored questions with a 240-minute time limit. PSI may also add 5 to 10 unscored experimental questions without extending the time allowed.
You need 70% correct on the scored portion of the exam to pass the AZ-EC trade exam.
You may bring the approved 2017 National Electrical Code, NFPA 72 (2016 edition), and the specified 29 CFR 1926 OSHA reference. These can be pre-highlighted, underlined, annotated, and tabbed, but you cannot add loose papers or write in them during the exam.
You must wait 30 days before retaking it. If you fail a third time, subsequent retakes require a 90-day waiting period. Once you do pass, you have two years to apply that passing score toward a license application.