- What a 2B Actually Is
- Who Runs the Exam and Where the IAEI Name Fits
- Exam Format and Rules at a Glance
- The 12 Official Subject Areas
- Open-Book Rules and Choosing Your NEC Edition
- Registration, Fees, and Retakes
- What Passing Does and Does Not Give You
- Who Sits for the 2B
- Sequencing Your Preparation Around the Allocations
- Frequently Asked Questions
- The 2B is the Electrical General exam: 50 open-book, four-option multiple-choice questions in two hours, with an official cut-score of 70.
- Special Installations or Constructions carries the most questions of the 12 subject areas: eight of 50.
- The exam costs USD 130 per attempt, retakes included, and failed attempts require a 30-day wait.
- Passing alone does not confer a local license or certification; it is an exam result, not a permit to inspect.
What a 2B Actually Is
When someone asks "what is a 2B," the answer on this site is specific: it is the Electrical General (2B) examination, the legacy IAEI-associated exam administered under the NCPCCI National Certification Program for Construction Code Inspectors. It tests whether a candidate can apply the National Electrical Code (NFPA 70) to general electrical installations the way a code official or inspector must: finding the right article, reading it precisely, and doing the arithmetic that the code requires.
The acronym is crowded. Plenty of unrelated credentials, products, and standards are shorthand "2B." Everything below concerns only the Electrical General exam. If you are weighing it against other credential families, our overview pages on what a 2B is and what 2B stands for cover the naming in more depth, and the 2B certification overview frames the credential at a higher level.
Who Runs the Exam and Where the IAEI Name Fits
Three names appear around this exam, and keeping them straight prevents expensive confusion.
- NCPCCI is the program the exam belongs to. It imposes no prequalifications to sit for it.
- Prov is the current examination administrator. Testing is available at its centers or through ExamRoom.AI remote proctoring.
- IAEI (the International Association of Electrical Inspectors, now doing business as the Independent Alliance of the Electrical Industry) is the association historically tied to this exam.
In practice, treat the 2B as an exam administered by Prov within NCPCCI, and verify with any employer or jurisdiction exactly what they expect it to demonstrate. For the broader picture of what the credential does and doesn't represent, see what 2B certification means.
Exam Format and Rules at a Glance
| Feature | Electrical General (2B) |
|---|---|
| Delivery | Computer-based; Prov testing centers or ExamRoom.AI remote proctoring |
| Questions | 50, four-option multiple choice |
| Time allowed | Two hours |
| Open book | Yes, with approved references |
| Official cut-score | 70 |
| Fee | USD 130 per attempt, including retakes |
| Retake wait after a failed attempt | 30 days |
| Prequalifications | None imposed by NCPCCI |
| Calculator | On-screen; basic arithmetic and square root |
Two hours for 50 questions averages roughly two and a half minutes per item. That sounds generous until you meet the calculation questions, where locating the right table, applying a demand factor, and performing the arithmetic can consume several minutes each. The open-book format changes what you are being tested on: not memory, but navigation speed and interpretation accuracy. Our passing score breakdown explains how to read the cut-score of 70 and what it does and doesn't tell you.
The 12 Official Subject Areas
The Prov candidate bulletin (printed version 2024.03.12) publishes the exam outline as 12 subject areas with question counts, not percentage weights. The counts below are listed in official domain order and total 50. These are the official exam subject areas, not a preparation curriculum.
| # | 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 |
Where the questions concentrate
Special Installations or Constructions is the heaviest single area at eight questions, which is 16 percent of the question count if you do the division yourself, though the bulletin itself assigns no percentages. Motors other than Dwellings, Service Equipment and Conductors on the Supply Side of the Service, Special Occupancies, and Wiring Methods each carry five. Generators other than Dwellings is the lightest at just one question.
Special Installations or Constructions (8 questions)
The largest single block on the exam, and one that rewards candidates who know the NEC's Chapter 6 territory rather than only the general-purpose chapters.
- Expect questions that send you to a specific special-purpose article, so practice recognizing which article governs a described scenario.
- Read scope statements and definitions first; special installations often modify or supplement the general rules.
Calculations of Load and Calculations of Wire Size (3 + 3 questions)
Together these account for six questions, and each is typically multi-step.
- Load calculations require selecting the correct method and applying demand factors before arriving at a service or feeder size.
- Wire size calculations require working through ampacity, adjustment, correction, and termination considerations in the right order.
- The on-screen calculator handles only basic arithmetic and square root, so practice with that limitation.
Motors other than Dwellings (5 questions)
Motor circuits are a classic code-official topic because they involve several coordinated requirements.
- Be ready to move among conductor sizing, overload protection, short-circuit and ground-fault protection, and disconnecting means.
- Pay attention to the "other than dwellings" qualifier in the title; it frames the setting of the questions.
Service Equipment and Conductors on the Supply Side of the Service (5 questions)
This area covers the equipment and conductors ahead of the load-side distribution.
- Distinguish clearly between supply-side and load-side rules, since the same-looking component can fall under different requirements.
- Pair this with Domain 4, which covers conductors and overcurrent protection on the load side.
For a deeper tour of each area, including how the domains relate to one another, read our complete guide to all 12 content areas. If you want a sense of what makes the exam demanding, how hard the 2B exam is addresses difficulty candidly.
Open-Book Rules and Choosing Your NEC Edition
The 2B is an open-book exam, but "open book" has rules. According to the bulletin's reference-rules appendix, applicable approved references may be highlighted and permanently tabbed before testing, and the NEC Handbook is permitted where applicable. Always confirm the current rules with Prov before exam day, since administration rules are published in the bulletin and can be updated.
NEC 2017 versus NEC 2020 forms
The bulletin lists two forms: one based on NEC 2017 and one on NEC 2020. Both use identical subject allocations. The newer listed form is 2B Electrical General (2020 Code), using NFPA 70, National Electrical Code, 2020 edition.
A related point: many candidates search for NEC 2023 study material. A NEC 2023 study guide is useful preparation material, but it is not evidence of a newer NCPCCI 2B exam form. Use it to build understanding, and then confirm any edition-specific differences against the edition your exam form specifies. Our 2B study guide walks through how to build a reference-and-tabbing strategy around this.
Registration, Fees, and Retakes
Registration runs through the exam administrator, Prov. The fee is USD 130 per attempt, and that fee applies to retakes as well, so every attempt carries the same price. If you fail, you must wait 30 days before retesting.
That structure has a practical consequence: each attempt is a real cost in both money and time, so the economics favor arriving prepared rather than treating the first sitting as a trial run. For a full look at what else may add to your spend, such as reference books, tabs, or study materials, see the 2B certification cost breakdown. For scheduling mechanics, including testing-center versus remote-proctoring options, see 2B exam dates and scheduling, and for eligibility questions see 2B requirements.
What Passing Does and Does Not Give You
This is where many first-time searchers get tripped up. Passing the 2B does not by itself confer a local license or certification. The exam result is one input; whether it satisfies a particular employer, jurisdiction, or licensing board is determined by that body.
| Item | What it is |
|---|---|
| NCPCCI 2B exam | The 50-question Electrical General examination administered by Prov |
| IAEI-associated history | Legacy connection; current bulletin does not list IAEI as a partner |
| Local license or certification | Issued by the relevant jurisdiction or body; passing alone does not confer it |
| ICC E2 transition | A separate application with its own fee and approval |
| IAEI CEI program | A distinct program with its own examination and practicum |
The ICC E2 transition route
ICC's NCPCCI Reciprocity page, updated November 6, 2025, permits an E2 transition application using the NCPCCI 2B result, a supporting score report, and a current license. That application carries a separate fee and requires approval from ICC. In other words, the 2B can be a stepping stone toward an ICC credential, but it is not automatic. Check the ICC page directly for current terms before relying on this route.
Why the pass rate question has no clean answer
Candidates often ask for a pass rate. No authoritative current empirical pass rate has been verified for this exact examination, and the cut-score of 70 is a scoring threshold, not a statistic about how many candidates pass. Treat any provider's guaranteed-pass claim with caution. Our pass rate analysis explains the distinction in more detail.
Who Sits for the 2B
Because NCPCCI imposes no prequalifications, the exam is open to anyone willing to pay the fee and prepare. In practice, the people who benefit most are those whose work touches code enforcement and plan review: electrical inspectors, plans examiners, and building department staff, along with electricians and contractors who want to demonstrate fluency with the NEC from the inspector's side of the table.
Whether it is worth the investment depends on what your jurisdiction or employer asks for. Some job postings reference exam results as a requirement or a preference; others rely on a different credential entirely. Rather than assume, check recent postings in your region for the credentials they name. For career-side perspective, see our 2B jobs overview, our salary guide, and the worth-it ROI analysis. Salary figures for electrical inspection occupations reflect the occupation broadly; do not read them as a guaranteed premium for holding any single exam result.
Key Takeaway
Before you register, find out exactly what your target employer or jurisdiction wants. The exam is open to anyone, but its career value depends on whether the people who hire or license you recognize it.
Sequencing Your Preparation Around the Allocations
Generic study advice matters less here than matching your time to the actual question allocations and the way the open-book format rewards navigation. A sensible approach is to front-load the heavy and calculation-driven areas, then fold in the lighter ones. Here is one illustrative way to allocate a six-week window. Adjust it to your own strengths and the time you have.
Reference setup and Wiring Methods
- Confirm your exam form (2017 or 2020 NEC), purchase the matching edition, and tab it.
- Work through Domain 12, Wiring Methods (five questions), since it builds general code-navigation habits.
Calculations
- Domain 2 (Calculations of Load) and Domain 3 (Calculations of Wire Size): six questions combined.
- Practice with only basic arithmetic and square root, matching the on-screen calculator.
Service, load-side conductors, and equipment
- Domain 8 (supply side) and Domain 4 (load side), noting where the rules diverge.
- Domain 1 and Domain 11 for cabinets, panelboards, boxes, switches, and disconnects.
Motors and utilization
- Domain 7 (Motors other than Dwellings, five questions).
- Domain 6 (Lighting and Utilization Equipment) and the single-question Domain 5 (Generators other than Dwellings).
The biggest block
- Domain 9 (Special Installations or Constructions, eight questions) and Domain 10 (Special Occupancies, five questions).
- Drill identifying which special-purpose article governs a described scenario.
Timed practice
- Take full 50-question, two-hour sessions using your tabbed reference.
- Review misses by domain and revisit the weakest areas.
Timed practice on realistic questions is where preparation turns into exam readiness. You can build that habit with the full-length simulations on the 2B practice test site, and you can pair it with our one-page cheat sheet for quick reference. For program-level options beyond self-study, see our overview of 2B training. When you are ready to measure yourself against exam-style questions, start a session on the main practice test page.
Frequently Asked Questions
It covers Electrical General under NCPCCI: 12 official subject areas spanning enclosures and panelboards, load and wire-size calculations, load-side and supply-side conductors, generators, lighting, motors, service equipment, special installations, special occupancies, switches and disconnects, and wiring methods. Together they total 50 questions.
The exam has 50 four-option multiple-choice questions and allows two hours. It is computer-based and open book, and the official cut-score is 70.
The fee is USD 130 per attempt, retakes included. After a failed attempt, you must wait 30 days before testing again.
No. Passing alone does not confer a local license or certification. Whether the result satisfies a jurisdiction or employer is decided by that body. The result can also support an ICC E2 transition application, which has its own fee and approval.
Use the edition that matches your exam form. The bulletin lists NEC 2017 and NEC 2020 forms with identical subject allocations, and the 2020 form is the newer one. You may bring other editions of the same title, but the specified edition governs the answers. A NEC 2023 study guide is preparation material, not a newer exam form.