- What Does AZ-EC Stand For?
- The Exam Behind the Acronym
- Who Administers It and Why That Matters
- What's Actually Tested: The 15 Domains
- Format, Fees, and Scoring Mechanics
- Open-Book References You're Allowed to Use
- Qualifying to Sit for the Exam
- Retakes and Licensing After You Pass
- Preparing Strategically for This Specific Exam
- Frequently Asked Questions
- AZ-EC refers to the Arizona C-11 (CR-11) Electrical (Commercial) trade examination, not a residential or NASCLA outline.
- The trade exam has 110 scored questions in 240 minutes, plus possibly 5-10 unscored pilot items, with 70% needed to pass.
- The trade exam costs $66; the separate Statutes and Rules Exam costs $61 through the ROC.
- Three domains tie for the largest share of the test: Service Feeders and Branch Circuits, Grounding and Bonding, and Special Occupancies and Equipment, at 13...
What Does AZ-EC Stand For?
On this site, AZ-EC is shorthand for the Arizona C-11 (CR-11) Electrical (Commercial) Trade Exam - the state-specific trade competency test administered through the Arizona Registrar of Contractors (ROC) and delivered by PSI Services LLC. It is not a generic industry credential and it is not interchangeable with any other certification that happens to share the same three-letter abbreviation. If you searched for "AZ-EC" expecting something else, this page - and every other page on azecexam.com - is specifically about the C-11 commercial electrical trade outline used to qualify contractors in Arizona.
The distinction matters because Arizona's licensing structure includes multiple related-but-different electrical exam paths: the R-11 residential outline, a NASCLA-accredited alternative accepted in some circumstances, and the C-11/CR-11 commercial trade exam covered here. AZ-EC as used on this site refers exclusively to the commercial version. If you're studying for a different Arizona electrical license classification, make sure the materials you're using actually reference the C-11 commercial outline and not a residential blueprint with a similar name.
The Exam Behind the Acronym
The C-11 (CR-11) Electrical (Commercial) exam is the trade competency test a qualifying party must pass to hold a commercial electrical contractor's license in Arizona. It sits alongside - but is separate from - the Statutes and Rules Exam, which covers Arizona contracting law rather than electrical trade knowledge. Both exams are typically required as part of the licensing process managed by the ROC.
The commercial outline was last revised June 8, 2023, and the general PSI bulletin governing test-day procedures is dated February 18, 2026. Candidates should always confirm they are studying the current commercial version rather than an outdated bulletin or the residential R-11 outline, since content weighting and references can shift between revisions. If you want a deeper breakdown of how the outline is organized topic by topic, the AZ-EC Exam Domains 2026: Complete Guide to All 15 Content Areas covers each content area in detail.
Who Administers It and Why That Matters
Two organizations sit behind the AZ-EC name. The Arizona Registrar of Contractors sets licensing policy, eligibility requirements, fees, and the overall application process. PSI Services LLC is the testing vendor that builds, delivers, and scores the actual exam - both at physical test centers and through remote proctoring.
Understanding this split matters practically:
- Application status, bonding, insurance, and business requirements route through the ROC.
- Scheduling, exam-day rules, calculator policy, and reference-book handling route through PSI.
- Fee payment for the trade exam and the Statutes and Rules Exam happens through the ROC's online process, not directly with PSI.
Because two systems are involved, a common early mistake is assuming a single "AZ-EC portal" handles everything. It doesn't. Candidates typically manage eligibility and licensing paperwork with the ROC while managing test scheduling and test-day logistics with PSI.
Key Takeaway
Treat the ROC and PSI as two separate systems: one governs whether you're eligible and licensed, the other governs how and when you actually sit for the test.
What's Actually Tested: The 15 Domains
The commercial trade blueprint spans 15 content domains, and PSI publishes the exact item allocation for each. Across the 110 scored questions, the distribution is: 5, 13, 13, 12, 10, 13, 2, 5, 5, 3, 1, 5, 5, 8, and 10 items, following the domain order below.
Domain 1: General Electrical Knowledge
Foundational concepts and terminology that support every other domain - smaller in item count but assumed knowledge throughout the exam.
Domain 2: Service Feeders and Branch Circuits
One of the three largest domains at 13 items. Expect detailed calculation and code-application questions on sizing, loading, and circuit design for commercial installations.
- High-value area for sizing and load calculation practice
Domain 3: Grounding and Bonding
Also tied for the largest domain at 13 items. Grounding electrode systems, bonding jumpers, and equipment grounding conductor requirements are core commercial-code topics here.
Domain 6: Special Occupancies and Equipment
The third domain tied at 13 items. This area covers equipment and occupancy classifications that commonly appear in commercial buildings - a heavily weighted section worth disproportionate study time.
The remaining domains - Conductors and Cables (12), Raceways and Boxes (10), Devices (2), Motors (5), Low Voltage (5), Lighting (3), Illuminated Signs (1), Fire Detection and Alarm Systems (5), Safety (5), Overcurrent Protection (8), and Photovoltaics (10) - round out the blueprint. Notice how unevenly weighted this test is: Illuminated Signs carries a single question while three other domains carry 13 each. Spending equal time on every domain is a common and costly planning mistake. For a full walkthrough of what each domain actually asks and how to sequence your review, see the AZ-EC Exam Domains 2026: Complete Guide to All 15 Content Areas.
| Domain | Item Count |
|---|---|
| General Electrical Knowledge | 5 |
| Service Feeders and Branch Circuits | 13 |
| Grounding and Bonding | 13 |
| Conductors and Cables | 12 |
| Raceways and Boxes | 10 |
| Special Occupancies and Equipment | 13 |
| Devices | 2 |
| Motors | 5 |
| Low Voltage | 5 |
| Lighting | 3 |
| Illuminated Signs | 1 |
| Fire Detection and Alarm Systems | 5 |
| Safety | 5 |
| Overcurrent Protection | 8 |
| Photovoltaics | 10 |
Format, Fees, and Scoring Mechanics
The AZ-EC trade exam is a computer-based, multiple-choice test consisting of 110 scored questions administered in a 240-minute window. PSI may embed 5-10 additional unscored experimental questions within that same time allotment - meaning you won't necessarily know which items count toward your score, so every question deserves full attention. A passing result requires 70%.
The trade exam fee is $66. The separate Statutes and Rules Exam, required as part of the broader licensing process, costs $61 and is paid through the ROC's online system rather than bundled with the trade exam fee. For a complete breakdown of every cost associated with getting licensed, see AZ-EC Certification Cost 2026: Complete Pricing Breakdown.
Testing is available at physical test centers or via remote online proctoring. If you choose remote testing, know the tradeoffs going in: remote sessions prohibit breaks and prohibit scratch paper, which changes how you should pace long calculation-heavy sections like Service Feeders and Branch Circuits.
Open-Book References You're Allowed to Use
Unlike closed-book professional exams, the AZ-EC trade exam permits candidates to bring approved reference materials into the test session. The specified references are:
- The 2017 National Electrical Code
- NFPA 72 National Fire Alarm Code, 2016 edition
- The specified 29 CFR 1926 OSHA reference
These approved books may be pre-highlighted, underlined, annotated, and permanently tabbed before you arrive. That preparation work should happen well in advance of test day, not the night before. What's not allowed: loose papers added into the books, and any writing done inside the books during the exam itself. Treat your NEC and NFPA 72 copies as finished reference tools by the time you walk in - tabbed to article and chapter, with your own permanent annotations already in place.
You'll also need a basic non-scientific, non-programmable calculator that meets PSI's device rules. Bring a calculator you've actually practiced with; test-day is the wrong time to learn a new device's button layout, especially under a 240-minute clock covering 110 questions.
Key Takeaway
Your NEC, NFPA 72, and OSHA reference should be tabbed and annotated weeks before your test date - not assembled the morning of your appointment.
Qualifying to Sit for the Exam
Before you can register for the AZ-EC trade exam, the qualifying party generally needs four years of practical or management-level trade experience, with at least two of those years falling within the preceding ten years. Qualifying education or documented manufacturer training can offset up to two years of that experience requirement.
Beyond experience, the ROC's licensing process layers in additional requirements:
- A formal license application
- Business entity documentation
- A background check
- A contractor's bond
- Proof of required insurance
None of these are exam-content items, but they gate whether you can schedule the exam in the first place, so it's worth mapping out early. The AZ-EC Requirements 2026: Eligibility, Prerequisites & How to Qualify guide walks through each of these pieces in sequence.
Retakes and Licensing After You Pass
If you don't pass on your first attempt, there's a mandatory 30-day waiting period before you can retake the trade exam. After a third failed attempt, and any attempt beyond that, the waiting period extends to 90 days. This makes early domain-by-domain preparation far more valuable than cramming and hoping - a second failed attempt costs both money and months.
Once you do pass, the clock keeps running: a qualifying exam pass must be used toward a license application within two years, or it expires. After licensure, contractor licenses in Arizona renew on a two-year cycle, requiring a renewal filing, fee, and continuously maintained bond. None of that renewal work involves retesting, but it does mean passing AZ-EC is the start of an ongoing compliance relationship with the ROC, not a one-time event.
Preparing Strategically for This Specific Exam
Generic study advice - flashcards, spaced repetition, timed practice - only helps if it's pointed at the right targets. For AZ-EC specifically, that means allocating your limited study hours in proportion to the blueprint, not evenly across all 15 domains.
Heaviest Domains First
- Service Feeders and Branch Circuits (13 items)
- Grounding and Bonding (13 items)
- Special Occupancies and Equipment (13 items)
Mid-Weight Domains
- Conductors and Cables (12 items)
- Raceways and Boxes (10 items)
- Photovoltaics (10 items)
- Overcurrent Protection (8 items)
Lower-Weight Domains and Book Navigation
- General Electrical Knowledge, Motors, Low Voltage, Fire Detection and Alarm Systems, Safety (5 items each)
- Lighting (3), Devices (2), Illuminated Signs (1)
- Practice locating references quickly in your tabbed NEC and NFPA 72
Because this is an open-book exam, part of your preparation should be procedural rather than purely factual: practicing how fast you can find the right article in your tabbed 2017 NEC under time pressure matters as much as memorizing the rule itself. A full study plan built around this sequencing is laid out in the AZ-EC Study Guide 2026: How to Pass on Your First Attempt, and if you're unsure how much difficulty to expect given your background, How Hard Is the AZ-EC Exam? Complete Difficulty Guide 2026 breaks that down further.
Practicing under realistic timed conditions on our practice test platform before test day helps surface which of the heavily weighted domains still need work, rather than discovering gaps during the actual 240-minute session.
Frequently Asked Questions
On this site, AZ-EC refers to the Arizona C-11 (CR-11) Electrical (Commercial) Trade Exam, the state-specific commercial electrical trade test administered through the Arizona Registrar of Contractors with PSI Services LLC as the testing vendor.
No. AZ-EC on this site refers specifically to the commercial C-11/CR-11 outline, which is distinct from the residential R-11 outline and from the NASCLA alternative pathway.
The scored portion consists of 110 questions with a 240-minute time limit. PSI may also include 5-10 additional unscored experimental questions within that same window.
The trade exam fee is $66. A separate Statutes and Rules Exam, required as part of the broader licensing process, costs $61 through the ROC's online system.
Yes. Approved references are the 2017 National Electrical Code, NFPA 72 National Fire Alarm Code (2016), and the specified 29 CFR 1926 OSHA reference. These may be pre-tabbed, highlighted, and annotated, but loose papers and in-exam writing in the books are not permitted.
For more on what this credential covers before you commit study time, see What Is AZ-EC? and AZ-EC Meaning, or start practicing directly on the AZ-EC practice test platform to see where your current knowledge lines up with the blueprint above.