- What the 2B Credential Actually Is
- Who Is Behind It: IAEI, NCPCCI, and Prov
- Exam Format, Fee, and Rules at a Glance
- The 12 Subject Areas and Their Question Counts
- Where the Points Concentrate
- Open-Book Rules and Edition Selection
- Sequencing Your Preparation by Domain
- What Passing Does and Does Not Give You
- Frequently Asked Questions
- The 2B exam is 50 open-book, four-option multiple-choice questions in two hours, with an official cut-score of 70.
- The fee is USD 130 per attempt, retakes included, and failed exams require a 30-day wait before retesting.
- Special Installations or Constructions carries the largest allocation: eight of the 50 questions.
- Passing alone does not confer a local license or certification; NCPCCI sets no prequalifications to sit.
What the 2B Credential Actually Is
On this site, "2B" means one thing: the Electrical General (2B) examination within the National Certification Program for Construction Code Inspectors (NCPCCI). It is an electrical code knowledge exam aimed at people who inspect, review, or enforce electrical installations under the National Electrical Code. If you are looking for a broader definition of the term, see our explainers What Is 2B? and What Does 2B Stand For?. This article is the deep dive into the certification itself: how the exam is built, who runs it, and what a passing score does and does not buy you.
The exam sits at the practical center of code-official work. Candidates are not asked to design a system from scratch; they are asked to look at a code situation, find the governing NEC requirement, apply any needed calculation, and pick the correct answer from four options. That makes it an exam about navigation and judgment as much as memory.
Who Is Behind It: IAEI, NCPCCI, and Prov
The identity of this credential is more tangled than most candidates realize, and sorting it out prevents expensive mistakes.
- The program: NCPCCI, the National Certification Program for Construction Code Inspectors, defines the 2B exam.
- The administrator: Prov currently administers testing, either at its testing centers or through ExamRoom.AI remote proctoring.
- The IAEI connection: The International Association of Electrical Inspectors (IAEI), now doing business as the Independent Alliance of the Electrical Industry, was named as a partner in an earlier Prov bulletin (printed version 2022.01.06a) that included this same 2B exam. The current bulletin retains 2B but omits IAEI from its partner list.
IAEI and ICC both sell a study guide in the same product family, which is one reason candidates sometimes conflate the exam with the association. The guide is preparation material; it is not the exam, and it is not evidence of a newer exam form.
Exam Format, Fee, and Rules at a Glance
| Item | 2B Electrical General |
|---|---|
| Format | Computer-based, four-option multiple choice |
| Questions | 50 |
| 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 |
| Delivery | Prov testing centers or ExamRoom.AI remote proctoring |
| On-screen calculator | Basic arithmetic and square root |
Two hours for 50 questions averages to roughly 2.4 minutes per item. That sounds generous until you remember that a Calculations of Load question may require locating a table, pulling several values, and working a multi-step computation. The open-book format shifts the challenge from recall to speed and accuracy in navigating the code book. For a fuller treatment of cost mechanics, see our 2B certification cost breakdown, and for score details visit 2B Passing Score.
Note the careful wording around the cut-score: 70 is the official passing mark, not a statistic describing how many candidates pass. No authoritative current empirical pass rate has been verified for this exam, so be skeptical of any provider quoting one with confidence. Our pass rate discussion explains how to evaluate such claims.
The 12 Subject Areas and Their Question Counts
The official bulletin publishes item counts, not percentage weights. The allocations below total exactly 50 questions. These are the official exam subject areas, not a preparation curriculum, which means they tell you what is tested but not how best to learn it.
| # | 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 |
For a narrative walk-through of each area, our complete guide to all 12 content areas goes deeper. One caution from the content landscape: some competitor pages place building-inspection subjects under the electrical exam. That is inaccurate. The 2B subject areas are all electrical and NEC-driven.
Where the Points Concentrate
Because the bulletin gives counts rather than percentages, the most defensible way to prioritize is by raw question numbers. Four areas together account for 23 of the 50 questions: Special Installations or Constructions (8), Motors other than Dwellings (5), Service Equipment and Conductors on the Supply Side of the Service (5), and Special Occupancies (5). Wiring Methods adds another 5.
Special Installations or Constructions (8 questions)
The single largest allocation, and the one most likely to punish a candidate who studied only the "core" chapters. These questions test whether you can find requirements that modify or supplement the general rules for unusual installation types.
- Practice locating the correct article quickly from a scenario description.
- Learn how special-installation rules override or add to general requirements.
- Tab the opening pages of each special-installation article so you can jump to scope and general requirements.
Motors other than Dwellings (5 questions)
Motor questions are often calculation-flavored and table-dependent, combining conductor sizing, overload protection, and short-circuit and ground-fault protection logic.
- Know how motor full-load current is determined versus the nameplate.
- Be able to distinguish branch-circuit protection from overload protection.
- Practice multi-motor feeder scenarios under time pressure.
Service Equipment and Conductors on the Supply Side of the Service (5 questions)
This area covers equipment and conductors ahead of the service disconnect, where grounding, bonding, and protection rules have their own logic.
- Understand where the "supply side" begins and ends for your scenario.
- Review service disconnect requirements and grouping.
- Pay attention to bonding differences between supply-side and load-side contexts.
Calculations of Load and Calculations of Wire Size (3 questions each)
Only six questions combined, but they are the ones that can eat the most clock time. Candidates who are slow on arithmetic-heavy items can lose the minutes that careful code lookup needs elsewhere.
- Drill the load-calculation sequence until it is automatic.
- Practice voltage drop, ampacity adjustment, and correction factors as chained steps.
- Use the on-screen calculator's limits (basic arithmetic and square root) in your practice runs.
Generators other than Dwellings has just a single question, so it deserves the lightest time investment, though not zero. Difficulty varies by candidate background; our piece on how hard the 2B exam is discusses why.
Open-Book Rules and Edition Selection
Open book does not mean unlimited. Per 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 verify the current rules on Prov's published bulletin before exam day, since remote proctoring adds its own environment requirements.
Which NEC edition?
The bulletin lists NEC 2017 and NEC 2020 forms with identical subject allocations. The 2020 form, titled 2B Electrical General (2020 Code) and based on NFPA 70, is the newer listed form. Other editions of the same reference title may be brought into the exam, but the specified edition governs the answers. If you carry an NEC 2023 book, the exam will still be scored against the specified 2017 or 2020 code.
A practical tabbing strategy follows the exam's structure: tab the major articles for motors, services, special occupancies, and special installations; tab the calculation tables you will reuse; and tab the wiring-method articles you will compare against each other. For a quick-reference companion, see the 2B cheat sheet.
Sequencing Your Preparation by Domain
You do not need a generic study-habit lecture here, just a sensible order driven by the exam's actual allocations. The sequence below front-loads the high-count and calculation-heavy areas, then folds in the smaller ones. For a full preparation framework, read our 2B study guide.
Foundation and calculations
- Set up and tab your reference edition.
- Work Calculations of Load and Calculations of Wire Size until the steps are routine.
Service and load-side protection
- Service Equipment and Conductors on the Supply Side of the Service.
- Conductors and Overcurrent Protection on the Load Side of the Service.
Motors and equipment
- Motors other than Dwellings with timed multi-step scenarios.
- Switches, Disconnects and Controllers; Lighting and Utilization Equipment.
Special topics and containment
- Special Installations or Constructions and Special Occupancies, the biggest combined block.
- Wiring Methods; Cabinets, Panelboards, Switchboards, Boxes, and Conduit Bodies; a light pass on Generators.
Full-length timed practice
- Run two-hour, 50-question simulations with only your approved, tabbed references.
- Review misses by domain and re-tab weak spots.
Because the retake wait is 30 days and each attempt costs USD 130, a realistic practice run before booking is cheaper than a failed attempt. You can test yourself with timed items on our 2B practice test site.
What Passing Does and Does Not Give You
Passing the exam alone does not confer a local license or certification. It demonstrates NEC knowledge to a recognized standard; whether it satisfies an employer or jurisdiction depends on local rules. Check with your authority having jurisdiction, and see our pages on 2B requirements and whether the certification is worth it.
ICC E2 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 with its own review, not an automatic conversion.
CEI-M and other IAEI routes
CEI-M is a distinct program with its own examination and practicum. It is not the same thing as passing 2B, and the two should not be bundled in your planning. IAEI's current certification page describes its joint ICC and CEI programs separately.
Careers and earnings
Employers hiring for electrical inspection and plan-review roles vary by jurisdiction, seniority, and local licensing rules, so read each posting's actual requirements. No reliable credential-specific salary premium has been established here, and occupation-wide wages should not be mistaken for a 2B bonus. For discussion, see 2B jobs and the 2B salary guide. For scheduling logistics, see 2B exam dates.
Frequently Asked Questions
It is the Electrical General (2B) examination from the National Certification Program for Construction Code Inspectors: 50 open-book, four-option multiple-choice questions in two hours, with an official cut-score of 70, administered by Prov.
The fee is USD 130 per attempt, including retakes. After a failed attempt you must wait 30 days before retesting.
NCPCCI imposes no prequalifications to sit the exam. However, passing alone does not confer a local license or certification, so check what your employer or jurisdiction requires.
The bulletin lists NEC 2017 and NEC 2020 forms, with the 2020 form being newer. The specified edition governs answers, and an NEC 2023 study guide is preparation material, not 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 have five.