- What This Cheat Sheet Covers (and What 2C Actually Is)
- Exam Format and Logistics at a Glance
- The 50-Question Map: Official Item Counts by Domain
- The Three Heaviest Domains
- Calculation Patterns Worth Memorizing
- Open-Book Rules and How to Tab Your References
- NEC 2017 vs NEC 2020 on This Exam
- Passing the Exam vs. Authority to Approve Plans
- Source Traps to Avoid
- A Domain-Ordered Review Sequence
- Frequently Asked Questions
- 2C is a 50-question, two-hour, open-book, four-option multiple-choice exam with an official cut-score of 70.
- Special Installations has the most items (7); Calculations of Load and Service Supply-Side Conductors have 6 each.
- The exam fee is USD 130 per attempt, retakes included, with a 30-day wait after a failed attempt.
- The bulletin lists NEC 2017 and NEC 2020 forms; the specified edition governs answers, whatever book you bring.
What This Cheat Sheet Covers (and What 2C Actually Is)
This page condenses the facts you need to hold in your head before test day for the Electrical Plan Review (2C) examination. Here, "2C" refers specifically to the legacy IAEI-associated NCPCCI Electrical Plan Review exam, currently administered by Prov. It is a national, code-based written exam aimed at people who review electrical construction documents for compliance. If you are still orienting yourself, the explainers at What Is 2C? and What Does 2C Stand For? cover the naming in more detail.
One identity note matters for how you read other material online. The older Prov bulletin (printed version 2022.01.06a) named IAEI as a partner. The current bulletin, printed version 2024.03.12, keeps the 2C exam but no longer lists IAEI among its partners, and its exam specifications do not establish that IAEI currently issues or renews a credential. IAEI, which now does business as the Independent Alliance of the Electrical Industry, remains relevant mainly because its Plan Review Study Guide explicitly targets this exam. Treat the Prov bulletin as the controlling document for exam rules.
Exam Format and Logistics at a Glance
| Item | 2C Fact |
|---|---|
| Exam title | NCPCCI 2C Electrical Plan Review (2020 Code), with a separately listed NEC 2017 form |
| Administrator | Prov, via testing centers or ExamRoom.AI remote proctoring |
| Format | Computer-based, four-option multiple choice |
| Length | 50 questions in two hours |
| Books | Open book; approved references may be highlighted and permanently tabbed |
| Official cut-score | 70 |
| Fee | USD 130 per attempt, including retakes |
| Retake wait | 30 days after a failed exam |
| Prequalifications | None imposed by NCPCCI to sit the exam |
| Calculator | On-screen calculator that includes square root |
Two hours for 50 questions is roughly two and a half minutes per item. That is generous for a recall exam but tight for a calculation-heavy, open-book exam, because every lookup costs time. Details on cost components beyond the exam fee are in the 2C certification cost breakdown, and the eligibility picture is in 2C Requirements.
The 50-Question Map: Official Item Counts by Domain
The bulletin publishes item counts, not percentage weights, so this sheet uses counts only. The twelve allocations below total exactly 50.
| Domain | Subject Area | Items |
|---|---|---|
| 1 | Cabinets, Panelboards, Switchboards, Boxes, and Conduit Bodies | 4 |
| 2 | Calculations of Load | 6 |
| 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 | 4 |
| 8 | Service Equipment and Conductors on the Supply Side of the Service | 6 |
| 9 | Special Installations or Constructions | 7 |
| 10 | Special Occupancies | 4 |
| 11 | Switches, Disconnects and Controller | 4 |
| 12 | Wiring Methods | 3 |
Notice that Domain 11 keeps the source's singular "Controller" in its title. Scan the table once more and a pattern emerges: most domains sit at three or four items, so no single topic can sink you, but the lopsided ones reward targeted effort. Domain 5, Generators other than Dwellings, is a single question, which makes it the lowest-return topic per hour of study. For a fuller walkthrough of every area, see the complete guide to all 12 content areas.
The Three Heaviest Domains
Three domains together account for 19 of the 50 questions, which is 38 percent of the exam by simple arithmetic on the official counts. They deserve disproportionate attention.
Domain 9: Special Installations or Constructions (7 items)
The single largest allocation. This domain draws on the NEC's special-condition articles rather than the general wiring chapters.
- Expect questions where the special article modifies or overrides general rules
- Practice locating the right article quickly using your tabs and the index
- The bulletin's public samples include a mobile-home park feeder sizing problem, which sits in this territory
Domain 2: Calculations of Load (6 items)
Load calculations are the backbone of plan review, since feeder and service sizing flow from them.
- Know which method applies: standard, optional, or occupancy-specific
- Apply demand factors from the correct table for the occupancy
- The public samples include an auditorium lighting branch-circuit calculation
Domain 8: Service Equipment and Conductors on the Supply Side of the Service (6 items)
This domain covers what happens ahead of and at the service disconnect.
- Service conductor sizing and the service neutral load, which appears in the public samples
- Equipment ratings and protection at the service
- Distinguish supply-side rules from load-side feeder and branch-circuit rules
Key Takeaway
Spend your first and deepest study blocks on Domains 9, 2, and 8, then spread the rest. Because Domains 2, 3, and parts of 8 are arithmetic-driven, they also offer the most points you can earn through practice rather than memorization.
Calculation Patterns Worth Memorizing
The bulletin's public samples (page 18) are a reliable preview of question style: a mobile-home park feeder sizing problem, an auditorium lighting branch-circuit calculation, and a service neutral-load problem. The patterns below are original preparation exercises built around those themes, not reproductions of exam items. Work every one with your own NEC edition open so you build the table-lookup reflex.
Mobile-home park feeder sizing
- Identify the number of lots and the per-lot load basis in the mobile-home park article.
- Apply the article's demand factors for the number of lots served.
- Convert the resulting load to amperes at the system voltage.
- Select the conductor from the ampacity table and verify the overcurrent device rating.
Auditorium lighting branch circuits
- Determine the lighting load, noting whether the unit-load table or the actual connected load governs.
- Check for continuous-load multipliers on branch circuits and overcurrent protection.
- Divide by the circuit rating to find the number of branch circuits required.
Service neutral load
- Start from the calculated load on the ungrounded conductors.
- Identify the portion that is actually carried by the neutral, such as the maximum unbalance.
- Apply permitted reductions only where the rules allow them, and exclude loads the rules do not permit reducing.
For a structured approach to turning these patterns into a routine, the 2C Study Guide pairs well with timed practice on the 2C practice test site.
Open-Book Rules and How to Tab Your References
Open book does not mean easy. It means the exam tests your ability to navigate the code under time pressure. The bulletin's reference rules (appendix on PDF page 22, plus the administration pages) set the framework: approved reference books may be highlighted and permanently tabbed before testing, and the applicable NEC Handbook is permitted. Always confirm the current list against the bulletin before you buy or mark anything, since rules can be updated.
- Tab by topic, not by chapter number alone. Label tabs for load calculation tables, ampacity tables, conductor properties, special-article starts, and the Chapter 9 tables.
- Highlight table titles and exception triggers. A faded exception is a common source of wrong answers.
- Practice with the on-screen calculator. It includes square root, so rehearse the keystroke order for three-phase calculations.
- Time your lookups. If finding a table takes more than about thirty seconds in practice, your tabs need work.
NEC 2017 vs NEC 2020 on This Exam
The current bulletin lists both NEC 2017 and NEC 2020 forms with identical subject allocations. The 2020 form is the newer listed form. Two rules keep candidates out of trouble:
- You may bring other editions of the same reference title, but the specified edition governs the answers. If a question is written under the 2020 code, a 2023 book can mislead you where sections were renumbered or revised.
- Newer retail study guides, such as IAEI's NEC 2023 guide, are preparation material. They are not proof that a newer NCPCCI 2C exam form exists.
IAEI's Plan Review Study Guide, NEC-2020 explicitly identifies NCPCCI 2C preparation. That makes it the closest official-adjacent match for the 2020 form. IAEI, the ICC Store, and Builder's Book sell the same guide family, so seeing the same guide on three sites is one resource, not three independent opinions.
Passing the Exam vs. Authority to Approve Plans
Passing 2C alone does not confer a local license, certification, or authority to approve plans. Those come from the jurisdiction or employer, and requirements vary. The exam demonstrates examined knowledge; it does not appoint you as a plans examiner. For the practical question of how the credential connects to employment, see 2C Jobs, and for the broader value judgment, Is the 2C Certification Worth It?.
| Question | Answer Grounded in Public Sources |
|---|---|
| Does 2C alone grant plan-approval authority? | No. Local authority is separate from exam success. |
| Is 2C alone enough for an ICC E3 transition? | No. ICC's reciprocity page requires both NCPCCI 2B and 2C, plus a current license, score reports, a separate fee, and approval. |
| What is the E3 transition fee? | The ICC product listed a separate USD 140 transition fee as retrieved October 7, 2026. |
| Any renewal rule for 2C itself? | None verified. The ICC condition about certificates older than three years is an ICC transition condition, not a verified NCPCCI or IAEI renewal rule. |
Salary expectations belong in their own context. Occupation-wide wage data and vendor claims should never be read as a guaranteed outcome of this one exam; the 2C Salary Guide keeps that distinction explicit.
Source Traps to Avoid
Other cautions worth keeping on the sheet:
- IAEI's current ICC joint and CEI programs are separate routes from 2C.
- Other credentials share the "2C" label. Anything not describing NCPCCI Electrical Plan Review should be disregarded. The explainers 2C Meaning and What Is 2C Certification? help separate the usages.
- Marketplace answer keys have not been independently validated. Treat them as unverified until you check the code yourself.
A Domain-Ordered Review Sequence
If you have a few weeks, sequencing by item count and dependency beats going in numerical order. This is the one scheduling section in this sheet, and it is tied to the official allocations.
Load and Service Foundations
- Domain 2 (6 items) and Domain 8 (6 items) first, since later calculations depend on them
- Work the service neutral-load pattern until it is routine
Special Installations and Sizing
- Domain 9 (7 items), including the mobile-home park feeder exercise
- Domain 3 (3 items) and Domain 4 (4 items) to tie wire size and protection together
Equipment, Occupancies, and Methods
- Domains 1, 6, 7, 10, 11, and 12 at three or four items each
- Domain 5 last: a single item, so keep it to a quick review
Timed Open-Book Simulation
- Full 50-question runs in two hours with your tabbed books and the calculator
- Review misses by domain and re-tab anything you could not find quickly
Remember that a failed attempt means a 30-day wait and another USD 130 fee, so a realistic timed simulation before booking is cheaper than a retake. Scheduling mechanics are covered in 2C Exam Dates, and a candid read on difficulty is in How Hard Is the 2C Exam?. For a quick return to this page later, the canonical link is the 2C cheat sheet.
Frequently Asked Questions
The exam has 50 four-option multiple-choice questions to be completed in two hours. It is computer-based and open book, with an official cut-score of 70.
The fee is USD 130 per attempt, retakes included. After a failed exam you must wait 30 days before retaking. Application and transition fees for other programs are separate.
Other editions of the same reference title may be brought, but the specified edition governs the answers. The bulletin lists NEC 2017 and NEC 2020 forms, with 2020 as the newer one, and permits tabbing, highlighting, and the applicable NEC Handbook.
NCPCCI imposes no prequalifications to take the exam. However, passing does not by itself give you a local license, certification, or authority to approve plans, so check the requirements of the jurisdiction or employer you care about.
No. ICC's reciprocity requirements call for both NCPCCI 2B and 2C, along with a current license, supporting score reports, a separate transition fee, and approval. The 2C result alone does not satisfy that route.