- What This Exam Actually Is (and Isn't)
- Format, Fee and Testing Rules
- Choosing Your NEC Edition Before You Buy Anything
- The 12 Subject Areas and Their Question Counts
- Where the Points Are: Domain-by-Domain Priorities
- Open-Book Tactics: Tabs, Highlights and Time
- A Study Sequence Built Around the Domains
- What Passing Does and Does Not Give You
- Frequently Asked Questions
- The exam is 50 four-option multiple-choice questions in two hours, open book, with a cut-score of 70.
- Special Installations or Constructions carries the most questions: eight of the 50.
- Two NEC forms exist (2017 and 2020) with identical subject allocations; the specified edition governs your answers.
- The fee is USD 130 per attempt, retakes included, with a 30-day wait after a failed attempt.
What This Exam Actually Is (and Isn't)
Electrical General (2B) is an NCPCCI examination for electrical code inspectors. The scope here is the legacy IAEI-associated NCPCCI version of the exam, now administered by Prov. It tests whether you can find, interpret and apply National Electrical Code provisions across twelve subject areas, quickly, using reference books you bring with you.
Before you plan anything, clear up three common confusions:
- It is an exam, not a course. The twelve subject areas in the official bulletin describe what you can be asked, not how to study. No prequalification is imposed to sit for it.
- Passing is not a license. A passing result does not by itself confer a local license or certification. Your jurisdiction decides what it accepts.
- IAEI's role has changed. The current Prov bulletin retains 2B but omits IAEI from its partner list, so the exam specifications do not establish current IAEI credential issuance or renewal. IAEI's separate ICC joint and CEI programs are different routes.
If you are still orienting yourself on terminology, our explainers on what 2B is and 2B requirements and eligibility cover the background. This guide focuses on passing.
Format, Fee and Testing Rules
| Item | Detail |
|---|---|
| Questions | 50, four-option multiple choice |
| Time | Two hours |
| Cut-score | 70 |
| Book policy | Open book; approved references may be highlighted and permanently tabbed before testing |
| Calculator | On-screen, basic arithmetic and square root |
| Fee | USD 130 per attempt, including retakes |
| Retake wait | 30 days after a failed exam |
| Delivery | Computer-based at Prov centers or via ExamRoom.AI remote proctoring |
Two hours for 50 questions averages about 2.4 minutes per item. That sounds generous until you remember that many questions require you to locate an article, read an exception, and sometimes complete a multi-step calculation. Open book changes the skill being tested from recall to navigation speed.
For fee mechanics and what a failed attempt really costs, see our 2B certification cost breakdown. For scheduling, see 2B exam dates and scheduling. The official cut-score itself is unpacked in 2B passing score: exactly what you need. Note that a cut-score is not a pass rate, and no authoritative current empirical pass rate has been verified for this exam; see what the data shows on 2B pass rates.
Choosing Your NEC Edition Before You Buy Anything
This is the single most expensive mistake candidates make: buying the wrong code book, or tabbing a book that does not match the exam form.
The current candidate bulletin lists two forms: one based on the 2017 NEC and one based on the 2020 NEC. Both carry identical subject allocations. The 2020 form is the newer of the two. The exam is administered against NFPA 70, National Electrical Code, 2020 edition, for the newer listed form.
What about NEC 2023 study guides?
Many study guides on the market are written to the NEC 2023. That is useful preparation material, but it is not evidence of a newer NCPCCI 2B exam form. The bulletin you should trust is the Prov NCPCCI Candidate Information Bulletin, printed version 2024.03.12. Other editions of the same reference title may be brought into the exam, but the specified edition governs the answers. If you study from a 2023 guide and your question key is the 2020 text, a provision that changed between editions can cost you points even if you reasoned correctly.
The NEC Handbook is permitted where applicable, which makes it worth considering as a tabbed companion, since commentary can help you locate provisions faster. Confirm current reference rules in the bulletin's reference-rules appendix before test day.
The 12 Subject Areas and Their Question Counts
The bulletin publishes item counts, not percentage weights. Here are the official allocations in domain order, totaling 50 questions:
| # | Subject Area | Questions |
|---|---|---|
| 1 | Cabinets, Panelboards, Switchboards, Boxes, and Conduit Bodies | 4 |
| 2 | Calculations of Load | 3 |
| 3 | Calculations of Wire Size | 3 |
| 4 | Conductors and Overcurrent Protection on the Load Side of the Service | 4 |
| 5 | Generators other than Dwellings | 1 |
| 6 | Lighting and Utilization Equipment | 4 |
| 7 | Motors other than Dwellings | 5 |
| 8 | Service Equipment and Conductors on the Supply Side of the Service | 5 |
| 9 | Special Installations or Constructions | 8 |
| 10 | Special Occupancies | 5 |
| 11 | Switches, Disconnects and Controllers | 3 |
| 12 | Wiring Methods | 5 |
A deeper walk through each area lives in our complete guide to all 12 content areas. Here we focus on what the numbers mean for your preparation.
Where the Points Are: Domain-by-Domain Priorities
You need a score of 70 to pass. Because the allocations are fixed and published, you can budget your effort against them instead of studying every article evenly.
Domain 9: Special Installations or Constructions (8 questions)
The single largest block, worth more than any two small domains combined. This is the NEC's "special" territory, and questions tend to hinge on exceptions and article-specific rules that differ from the general requirements in Chapters 1 through 4.
- Learn how the special-installation articles modify, supplement or override general rules.
- Tab the article entry points so you can jump straight to the relevant scope and requirements.
- Practice recognizing which article governs a described scenario before you start hunting for the answer.
Domains 7, 8, 10 and 12 (5 questions each)
Together these account for 20 questions, which is 40 percent of the exam by count.
- Motors other than Dwellings: conductor sizing, branch-circuit short-circuit and ground-fault protection, overload protection and disconnecting means. Expect table lookups combined with multipliers.
- Service Equipment and Conductors on the Supply Side of the Service: service disconnects, grounding and bonding at the service, and supply-side conductor rules.
- Special Occupancies: hazardous locations, healthcare, assembly and similar occupancy-driven requirements. Classification logic matters more than memorization.
- Wiring Methods: raceway and cable type permissions, support, securing, fill and use limitations.
Domains 1, 4 and 6 (4 questions each)
Enclosure and box-fill questions, load-side conductor and overcurrent protection, and lighting and utilization equipment. These reward careful reading of tables and notes, and they are good places to bank dependable points.
Domains 2, 3 and 11 (3 questions each) and Domain 5 (1 question)
Load calculations and wire-size calculations are only six questions combined, but they are the ones where arithmetic mistakes and edition-specific table values bite hardest. Switches, disconnects and controllers is a modest block. Generators other than dwellings is a single question, so it deserves a short review, not a long one.
Key Takeaway
Do not assume small allocation means skippable. With a cut-score of 70, every question matters, but a one-question domain like Generators should earn a short targeted review, while Special Installations deserves repeated passes through the book.
How demanding all of this feels depends on your background. Our 2B difficulty guide discusses what makes the exam feel hard and who tends to struggle.
Open-Book Tactics: Tabs, Highlights and Time
An open-book exam is a lookup race. The bulletin allows applicable approved references to be highlighted and permanently tabbed before testing, so build your book into a tool.
Tab for retrieval, not decoration
- Tab the chapter starts, the table pages you will use constantly, and the entry articles for each special-installation topic.
- Tab Annex or informational material only if the bulletin's reference rules allow it for your form; check the appendix first.
- Highlight scope statements and the words that flip a rule: "except," "unless," "not less than," "not more than."
Work each question in a fixed order
- Identify the domain the scenario belongs to.
- Identify the governing article before opening the book.
- Read the exceptions after the general rule, since four-option distractors often come from the general rule when an exception applies.
- For calculations, write the setup, then use the on-screen calculator only for arithmetic.
Budget your two hours
Aim for a first pass that answers the quick lookups and flags the calculation-heavy items, then return to the flagged ones with the remaining time. Leaving 15 to 20 minutes at the end for review is a reasonable target.
A condensed reference of these rules is on our 2B cheat sheet, and you can rehearse the lookup rhythm on timed items at our practice test site.
A Study Sequence Built Around the Domains
Rather than a generic schedule, order your weeks by how domains depend on each other. Foundations first, heavy special-topic work in the middle, and timed simulation at the end. Adjust the length to your experience; this six-week outline assumes a working familiarity with the NEC.
Book setup and wiring fundamentals
- Order and tab the specified NEC edition; confirm reference rules.
- Domain 12 (Wiring Methods) and Domain 1 (Cabinets, Panelboards, Switchboards, Boxes, Conduit Bodies), since they train article navigation.
The calculation domains
- Domain 2 (Calculations of Load) and Domain 3 (Calculations of Wire Size).
- Work problems with only a basic calculator and square root to match exam conditions.
Load-side and equipment
- Domain 4 (load-side conductors and overcurrent protection), Domain 6 (Lighting and Utilization Equipment), Domain 11 (Switches, Disconnects and Controllers).
Service, motors and generators
- Domain 8 (Service Equipment and Supply-Side Conductors), Domain 7 (Motors other than Dwellings), and a short pass on Domain 5 (Generators other than Dwellings).
The largest blocks
- Domain 9 (Special Installations or Constructions) and Domain 10 (Special Occupancies), with extra time on Domain 9 because of its eight questions.
Timed simulation
- Full 50-question, two-hour sets with your tabbed book only.
- Review every miss by finding the exact article and exception you overlooked.
Why this order: the wiring-methods and enclosure domains teach you where things live in the code, which makes every later week faster. Calculations come early because they expose arithmetic and table-reading habits you need time to fix. The two largest content blocks come late so they are fresh, but they still leave a full week for simulation. If you need structured instruction instead of self-study, see our notes on 2B training options.
What Passing Does and Does Not Give You
Set expectations early, because they affect whether the USD 130 attempt makes sense for you.
- Local licensing is separate. Passing alone does not confer a local license or certification. Check what your jurisdiction or employer requires.
- ICC transition. ICC's NCPCCI reciprocity page, updated November 6, 2025, permits an E2 transition application using NCPCCI 2B, a supporting score report and a current license, with a separate fee and approval. It is an application, not an automatic conversion.
- CEI-M is a different program. It has its own examination and practicum and should not be treated as an alias for 2B.
- Career value varies. Salary and hiring depend on employer, location and seniority, and occupation-wide wages do not isolate a credential premium. For analysis, see the 2B salary guide, the overview of 2B jobs, and our ROI analysis.
For broader context on how the credential fits together, see 2B certification. For a refresher on the fundamentals, our guide on what 2B certification is is a quick read. When you are ready to test your lookup speed under time pressure, the 2B practice tests are built for exactly that.
Frequently Asked Questions
The exam has 50 four-option multiple-choice questions, and you have two hours. It is computer-based and open book, with an official cut-score of 70.
The current bulletin lists NEC 2017 and NEC 2020 forms with identical subject allocations, and the 2020 form is the newer one. The specified edition governs the answers, so match your references to the form you book. NEC 2023 study guides are preparation material, not proof of a newer exam form.
Special Installations or Constructions, with eight of the 50 questions. Motors other than Dwellings, Service Equipment and Conductors on the Supply Side of the Service, Special Occupancies, and Wiring Methods each carry five.
You must wait 30 days before retaking, and the USD 130 fee applies to each attempt, retakes included. Use the wait to review the articles behind your missed questions rather than simply re-reading the whole book.
No. Passing alone does not confer a local license or certification. Some candidates use a 2B score report toward an ICC E2 transition application, which requires a current license and a separate fee and approval, so confirm requirements with the relevant authority.