- The Class A Master (AM) exam covers 11 domains that mirror the NEC chapter structure, not random topics.
- The exam is 80 questions, open-book, with a 5-hour-30-minute limit and a 70% passing score.
- Some questions require more than one correct answer and no partial credit unless the question states otherwise.
- Exams on or after September 8, 2026 test against the 2026 NEC, changing code references inside several domains.
Why the 11 Domains Matter
The Minnesota Department of Labor and Industry (DLI) doesn't build the Class A Master electrician exam (identified in DLI's examination guide as AM) around abstract "electrical knowledge." It builds it around 11 specific domains that trace the structure of the National Electrical Code itself, plus a final domain covering applied theory. If you understand what each domain actually tests, you stop guessing at what to study and start preparing directly against the exam blueprint DLI publishes.
This matters more in 2026 than in a typical year. Exams administered on or after September 8, 2026 shift to the 2026 NEC, while a separate installation-code effective date lands on August 17, 2026. Those two dates don't move together, and several of the 11 domains reference code sections that could see numbering or requirement changes between cycles. Knowing which domain covers which chapter lets you track code updates efficiently instead of re-reading the entire NEC cover to cover.
The 11 MN-ME Domains at a Glance
Ten of the eleven domains track directly to NEC chapters and the introductory article; the eleventh domain pulls together applied theory and equipment knowledge that spans multiple chapters. Here's the full list in the order DLI presents it.
| Domain | Content Area |
|---|---|
| Domain 1 | Introduction |
| Domain 2 | Chapter 1 - General |
| Domain 3 | Chapter 2 - Wiring and Protection |
| Domain 4 | Chapter 3 - Wiring Methods and Materials |
| Domain 5 | Chapter 4 - Equipment for General Use |
| Domain 6 | Chapter 5 - Special Occupancies |
| Domain 7 | Chapter 6 - Special Equipment |
| Domain 8 | Chapter 7 - Specific Conditions and Systems |
| Domain 9 | Chapter 8 - Communication Systems (Outside and Entering Buildings) |
| Domain 10 | Chapter 9 - Tables |
| Domain 11 | Applied Electrical Theory, Electrical Systems and Equipment |
If you've already read the MN-ME Requirements 2026 guide, you know DLI requires an approved application before you can even schedule a seat. Once you're approved, this domain list is effectively your syllabus.
Domain-by-Domain Breakdown
Domain 1: Introduction
Covers the scope and purpose sections that open the NEC - the "why does this code exist and where does it apply" material. Candidates are expected to know how the code is organized before diving into chapter-specific requirements.
- Scope and application boundaries of the code
- How the introductory article frames every later chapter
Domain 2: Chapter 1 General
Definitions and general requirements form the backbone of every other domain. Misreading a definition here compounds into wrong answers throughout the rest of the exam.
- Terminology used consistently across later chapters
- General installation requirements that apply code-wide
Domain 3: Chapter 2 Wiring and Protection
Branch circuits, feeders, services, overcurrent protection, and grounding and bonding live here. This is one of the densest domains because so many calculation-style questions draw from it.
- Branch circuit and feeder sizing logic
- Grounding and bonding requirements
- Overcurrent protection rules
Domain 4: Chapter 3 Wiring Methods and Materials
Conductor and raceway types, boxes, and installation methods. Expect scenario-based questions about which wiring method is permitted in a given condition.
- Permitted and prohibited wiring methods by location
- Box and conduit fill considerations
Domain 5: Chapter 4 Equipment for General Use
Covers switches, receptacles, motors, appliances, and general-use equipment requirements - practical, field-relevant content that master electricians apply daily.
- Receptacle and switch installation rules
- General equipment and appliance requirements
Domain 6: Chapter 5 Special Occupancies
Hazardous locations, health care facilities, places of assembly, and other occupancy-specific rules. This domain rewards candidates who can match a location description to the correct article.
- Hazardous location classifications
- Occupancy-specific installation restrictions
Domain 7: Chapter 6 Special Equipment
Equipment such as elevators, signs, machinery, and other specialty installations that don't fit general-use rules. Expect narrower, more specific fact recall here.
- Equipment-specific article requirements
- Special installation clearances and disconnect rules
Domain 8: Chapter 7 Specific Conditions and Systems
Emergency systems, standby power, and other special conditions. These questions often test how a system must respond under abnormal or emergency circumstances.
- Emergency and standby system requirements
- Special condition wiring and control rules
Domain 9: Chapter 8 Communication Systems
Outside and entering-building communication wiring. Smaller in scope than earlier domains but still tested as its own content area.
- Communication circuit installation requirements
- Separation rules between communication and power wiring
Domain 10: Chapter 9 Tables
Conductor properties, conduit fill, and other reference tables. This domain tests your ability to pull the right number from the right table quickly - a skill worth practicing with the actual untabbed NEC you'll use on exam day.
- Reading and applying Chapter 9 tables under time pressure
- Cross-referencing table data with earlier chapter requirements
Domain 11: Applied Electrical Theory, Electrical Systems and Equipment
The catch-all domain covering theory-based and calculation-heavy questions that span multiple chapters - Ohm's Law applications, load calculations, and system design logic that master-level candidates are expected to perform without memorized shortcuts.
- Load calculations and circuit sizing math
- Applied theory questions that combine multiple domains
Key Takeaway
Domains 3, 10, and 11 carry the heaviest calculation load. If your math is rusty, budget extra practice time there before touching lighter-recall domains like 7 or 9.
How DLI Tests These Domains
The Class A Master exam is 80 multiple-choice questions administered in a single 5-hour-30-minute sitting, with a 70% passing requirement. Two format details matter for how you study each domain:
- Calculation questions are embedded throughout, not isolated. Domain 3 (wiring and protection), Domain 10 (tables), and Domain 11 (applied theory) are where most of these appear, but a calculation can technically show up anywhere the code requires a numeric answer.
- Some questions require more than one correct answer. Every question carries equal point value, and partial credit is not awarded unless the question itself states otherwise - so a multi-answer question you get half right still counts as missed unless the question specifies partial scoring.
The exam is open-book, but only with DLI-provided materials: an untabbed softcover NEC, the applicable Minnesota Laws and Rules Booklet, and a basic calculator. Personal reference materials, tabs, sticky notes, and electronic devices are prohibited. That untabbed detail is a bigger deal than it sounds - if you're used to studying with a heavily tabbed code book, you need to rebuild your table-of-contents navigation speed before exam day, especially for Domain 10's tables and Domain 6's occupancy-specific articles. For a deeper breakdown of exactly how difficult this format is in practice, see How Hard Is the MN-ME Exam? Complete Difficulty Guide 2026.
Registration, Fees, and Eligibility Tied to the Domains
Before any domain content matters, you have to get approved to sit for the exam. DLI's eligibility routes for the Class A Master license include:
- An electrical-engineering degree from an accredited college or university
- One year of work as a licensed journeyworker electrician
- Five years of practical experience planning, laying out, supervising, and installing electrical wiring, apparatus, or equipment
You apply to DLI with your education and experience documentation and must receive approval before you can schedule a test date. The application and examination fee is $50. If you don't pass, DLI requires a 30-day wait after your failure notification before you can apply to retest - which makes it worth spending that time reviewing specifically the domains where you lost points rather than restarting a general review. The full eligibility walkthrough lives in MN-ME Requirements 2026: Eligibility, Prerequisites & How to Qualify, and fee specifics are broken down in MN-ME Certification Cost 2026: Complete Pricing Breakdown.
Once licensed, remember that a personal master electrician license is separate from an electrical contractor business license - passing this 11-domain exam qualifies you individually, not your business. Master licenses expire on the last day of February in odd-numbered years, and renewal costs $93 with 16 hours of approved continuing education per two-year period, including at least 12 NEC hours. That continuing education requirement essentially forces ongoing review of the same domains you study for the initial exam.
Scheduling Domain Review Before Exam Day
Because the domains map directly to NEC chapters, the most efficient prep sequence follows the chapter order rather than jumping around. A simple four-week pass looks like this:
Foundations
- Domain 1 (Introduction) and Domain 2 (Chapter 1 General) - definitions and scope
- Begin Domain 3 (Wiring and Protection) since it's calculation-heavy and needs repetition
Core Wiring Content
- Finish Domain 3, then Domain 4 (Wiring Methods and Materials) and Domain 5 (Equipment for General Use)
Specialty Chapters
- Domains 6-9: special occupancies, special equipment, specific conditions, and communication systems
Tables and Applied Theory
- Domain 10 (Tables) practiced against the untabbed NEC layout
- Domain 11 (Applied Theory) as cumulative review, since it draws on every earlier domain
This isn't a generic study framework - it's sequenced specifically so that heavier calculation domains (3, 10, 11) get repeated exposure rather than a single pass. For a full walkthrough of pacing, practice-question strategy, and open-book navigation drills, see MN-ME Study Guide 2026: How to Pass on Your First Attempt. You can also run timed domain-by-domain practice sets on the main practice test site to see where your accuracy actually drops.
The 2026 NEC Transition and Domain Content
Exams taken on or after September 8, 2026 test against the 2026 NEC. This transition is separate from the August 17, 2026 installation-code effective date, so candidates scheduling around that window should confirm which code edition applies to their specific exam date before finalizing their domain review. Because all 11 domains are chapter-based, a code edition change can shift specific section numbers or requirements inside any domain - most commonly in Domain 3 (Wiring and Protection), Domain 5 (Equipment for General Use), and Domain 8 (Specific Conditions and Systems), which tend to see more frequent code revisions cycle to cycle.
The Board of Electricity's April 14, 2026 minutes reported year-to-date master pass rates of 44.7% by total examinations and 47% by test taker - two different denominators, both measured before the September 2026 NEC transition took effect. Those numbers say nothing about post-transition performance, so don't assume difficulty stays flat once the new code edition is in play. A closer look at what these figures mean for your own prep is available in MN-ME Pass Rate 2026: What the Data Shows.
Key Takeaway
Confirm your exact exam date against the September 8, 2026 NEC transition before locking in which code edition to study - the domain names stay the same, but section-level content inside them can shift.
If you're still deciding whether this credential fits your career plans, the domain list above is a useful gut check: five of the eleven domains (4, 5, 6, 7, 9) are field-application heavy, while 3, 10, and 11 lean mathematical. Candidates coming from a strong journeyworker background typically find the field-application domains familiar and the calculation domains the harder lift. For context on how this license translates into job opportunities and pay, see MN-ME Salary Guide 2026: Complete Earnings Analysis and Is the MN-ME Certification Worth It? Complete ROI Analysis 2026. You can also browse practice questions organized by domain to benchmark your readiness before applying.
FAQ
There are 11 domains, matching DLI's examination matrix: an introduction domain, eight domains tied to NEC Chapters 1 through 8, one domain for Chapter 9 tables, and one domain for applied electrical theory and systems.
Domain 3 (Chapter 2, Wiring and Protection), Domain 10 (Chapter 9, Tables), and Domain 11 (Applied Electrical Theory) tend to carry the heaviest calculation load, though numeric questions can appear in any domain where the code specifies a value.
No. DLI provides an untabbed softcover NEC, the applicable Minnesota Laws and Rules Booklet, and a basic calculator. Personal reference materials and electronic devices are prohibited.
The 11 domain names stay the same, but exams taken on or after September 8, 2026 test against the 2026 NEC, which can change section numbers or requirements within domains like Wiring and Protection or Specific Conditions and Systems.
DLI requires a 30-day wait after failure notification before you can apply to retest. Use that window to target the specific domains where you missed the most points rather than repeating a full general review.