How to Tab an NEC Code Book
To tab an NEC code book, find each destination in your edition, attach only tabs your exam allows, and stagger them so every label stays readable. For an exam, first check whether you may bring your own book and how it may be marked; the exam examples below show why that matters.
Tab your NEC in 8 steps
- Confirm your exam's edition and tab rule.
- Open your candidate bulletin's reference-materials section.
- Note three things: the NEC edition, the binding it allows, and the exact tab wording.
- "Open book" alone tells you nothing about tabs.
- Get the right book.
- Read the edition on the title page. Match it to your bulletin, not to the newest release.
- Use the binding your exam allows. Texas, for example, admits soft-bound books only: no spiral, loose-leaf, ring-bound copies, or the NEC Handbook.
- Get tabs your exam accepts.
- Publisher-only rule: use the NEC publisher's tab set.
- Permanent-tab rule: use printed, permanent tabs.
- Where handwritten notes are banned, don't hand-letter labels.
- Not sure about a product? Ask the test vendor before you stick anything (a message template is below).
- Plan on paper before peeling anything.
- Print the tab map below.
- Look up each destination in your own book's Contents or Index.
- Write the page number on the printout, not in the book.
- Cross off topics your license exam doesn't cover.
- Page numbers copied from someone else's guide can be wrong for your printing.
- Dry-lay the layout.
- With the backing still on, plan a staircase of tabs along the outer (unbound) edge.
- Put article tabs in one or two columns and table tabs in their own column, so a table tab never hides an article tab.
- If your set came with a placement guide, follow it. It's sized to those tabs.
- Attach one tab at a time.
- Separate the single leaf that carries the heading. Never stick one tab across two leaves.
- Line the tab up with the page edge (or the fold mark, on fold-over tabs) and press it on as the set's instructions say.
- Keep the heading, section numbers, and text readable on both sides of the leaf.
- A common approach is to start with the Index at the bottom of the first column and work toward the front of the book, stepping each tab just above the last. When you hit the top, start the next column back at the bottom.
- Leave a little room above the bottom edge; the lowest tab takes the most wear.
- Line it up before you press; follow the adhesive instructions supplied with your tabs.
- Inspect it like a proctor would.
- Close the book and read every label.
- Open each tab and confirm it lands on the right heading.
- Fan the pages and look for overlapping labels, leaves stuck together, and anything removable or hand-written that your exam bans.
- Drill with it. Run the 12 lookups further down. Having tabs isn't the skill; getting to the right heading and reading its conditions is.
Your NEC tab map (2023 and 2026 editions)
Tabs are listed by article, section, and table number, not page number, so the map does not depend on pagination within either edition. The ★ Start here rows are a 12-entry core. Add the rest if your exam outline covers those topics and your practice shows you need them.
This map covers the 2023 and 2026 editions. It's our editorial starting plan, not an official list of tested topics. Confirm each destination in your own Contents before you stick anything. The labels below describe destinations; they do not authorize handwritten or homemade exam tabs.
Article and navigation tabs (54)
| # | Tab label | 2023 NEC | 2026 NEC | ★ Start here | Your page # |
|---|---|---|---|---|---|
| 1 | Contents | Front of book | Front of book | ★ | |
| 2 | Introduction | Art. 90 | Art. 90 | ||
| 3 | Definitions | Art. 100 | Art. 100 | ★ | |
| 4 | General requirements | Art. 110 | Art. 110 | ★ | |
| 5 | Load calculations | Art. 220 | Art. 120 | ★ | |
| 6 | Energy management (optional) | Art. 750 | Art. 130 | ||
| 7 | Grounded conductors | Art. 200 | Art. 200 | ||
| 8 | Branch circuits | Art. 210 | Art. 210 | ★ | |
| 9 | Feeders | Art. 215 | Art. 215 | ||
| 10 | Outside circuits | Art. 225 | Art. 225 | ||
| 11 | Services | Art. 230 | Art. 230 | ★ | |
| 12 | Overcurrent protection | Art. 240 | Art. 240 | ★ | |
| 13 | Grounding and bonding | Art. 250 | Art. 250 | ★ | |
| 14 | Wiring methods (general) | Art. 300 | Art. 300 | ||
| 15 | Conductors | Art. 310 | Art. 310 | ||
| 16 | Cabinets | Art. 312 | Art. 312 | ||
| 17 | Boxes | Art. 314 | Art. 314 | ★ | |
| 18 | Cables start (AC) | Art. 320 | Art. 320 | ||
| 19 | MC cable | Art. 330 | Art. 330 | ||
| 20 | NM cable | Art. 334 | Art. 334 | ||
| 21 | Raceways start (IMC) | Art. 342 | Art. 342 | ||
| 22 | PVC conduit | Art. 352 | Art. 352 | ||
| 23 | EMT | Art. 358 | Art. 358 | ||
| 24 | Cords | Art. 400 | Art. 400 | ||
| 25 | Switches | Art. 404 | Art. 404 | ||
| 26 | Receptacles | Art. 406 | Art. 406 | ||
| 27 | Panelboards | Art. 408 | Art. 408 | ||
| 28 | Luminaires | Art. 410 | Art. 410 | ||
| 29 | Appliances | Art. 422 | Art. 422 | ||
| 30 | Space heating | Art. 424 | Art. 424 | ||
| 31 | Motors | Art. 430 | Art. 430 | ||
| 32 | A/C and refrigeration | Art. 440 | Art. 440 | ||
| 33 | Generators | Art. 445 | Art. 445 | ||
| 34 | Transformers | Art. 450 | Art. 450 | ||
| 35 | Hazardous locations | Art. 500 | Art. 500 | ||
| 36 | Health care | Art. 517 | Art. 517 | ||
| 37 | Mobile homes | Art. 550 | Art. 550 | ||
| 38 | Marinas | Art. 555 | Art. 555 | ||
| 39 | Temporary installations | Art. 590 | Art. 590 | ||
| 40 | Signs | Art. 600 | Art. 600 | ||
| 41 | Elevators | Art. 620 | Art. 620 | ||
| 42 | EV charging | Art. 625 | Art. 625 | ||
| 43 | Pools and spas | Art. 680 | Art. 680 | ||
| 44 | Solar PV | Art. 690 | Art. 690 | ||
| 45 | Fire pumps | Art. 695 | Art. 695 | ||
| 46 | Emergency systems | Art. 700 | Art. 700 | ||
| 47 | Optional standby | Art. 702 | Art. 702 | ||
| 48 | Interconnected sources | Art. 705 | Art. 705 | ||
| 49 | Class 2 and Class 3 circuits | Art. 725 | Art. 725 | ||
| 50 | Fire alarm | Art. 760 | Art. 760 | ||
| 51 | Chapter 9 tables | Chapter 9 | Chapter 9 | ★ | |
| 52 | Conduit fill (same-size wires) | Annex C | Annex C | ||
| 53 | Worked examples | Annex D | Annex D | ||
| 54 | Index | Back of book | Back of book | ★ |
Article locations: NFPA’s 2023/2026 edition crosswalk.
Table and section tabs (16)
Put these in their own column so they don't crowd the article tabs. Where an entry names a section, open that section and find the table by its heading.
| # | Tab label | 2023 NEC | 2026 NEC | ★ Start here | Your page # |
|---|---|---|---|---|---|
| T1 | Working-space depth | Section 110.26(A)(1) | Section 110.26(A)(1) | ||
| T2 | Standard breaker/fuse sizes | Section 240.6 | Section 240.6 | ||
| T3 | Grounding electrode conductor (AC systems) | Table 250.66 | Table 250.66 | ||
| T4 | Main, system, and supply-side bonding jumpers | Table 250.102(C)(1) | Table 250.102(C)(1) | ||
| T5 | Wire-type equipment grounding conductor | Table 250.122 | Table 250.122 | ||
| T6 | Underground cover (burial depth) | Section 300.5 | Section 300.7 | ||
| T7 | Ambient-temperature correction | Section 310.15(B)(1) | Section 310.15(B)(1) | ||
| T8 | Adjustment (number of conductors) | Table 310.15(C)(1) | Table 310.15(C)(1) | ||
| T9 | Ampacity | Table 310.16 | Table 310.16 | ★ | |
| T10 | Box fill (metal boxes) | Table 314.16(A) | Table 314.16(A) | ||
| T11 | Motor full-load current | Tables 430.248 and 430.250 | Tables 430.248 and 430.250 | ||
| T12 | Motor branch-circuit short-circuit and ground-fault protection | Section 430.52 | Section 430.52 | ||
| T13 | Transformer protection (1000 V or less) | Table 450.3(B) | Table 450.5(B) | ||
| T14 | Conduit dimensions | Chapter 9, Table 4 | Chapter 9, Table 4 | ||
| T15 | Conductor dimensions | Chapter 9, Table 5 | Chapter 9, Table 5 | ||
| T16 | Conductor properties | Chapter 9, Table 8 | Chapter 9, Table 8 |
That's 70 map entries in all (69 if you skip the optional energy-management entry), not a requirement to attach 70 physical tabs. Some entries group destinations, such as the two motor-current tables. Fewer is fine. Twelve is our suggested core. The right number is whatever you can still read and actually use.
Table and section references: Minnesota’s examination guide, “Formulas and sample calculations”, its 2023 and 2026 inspection checklists, NFPA’s grounding and bonding fact sheet, pp. 2–6, and the transformer reference below. These are destinations to look up, not a substitute for reading a table’s conditions.
What moved in the 2026 edition
If your exam switched to the 2026 NEC, don't copy a 2023 tab plan.
- Load calculations moved from Article 220 to Article 120. In the 2026 Contents, Article 120 comes before Article 210 (NFPA edition crosswalk, 2023 and 2026 columns).
- Energy management systems moved from Article 750 to Article 130. The 2026 limited-energy reorganization does not move Class 2 and Class 3 circuit requirements out of Article 725; Article 720 is the general-requirements destination for limited-energy systems (NFPA edition crosswalk).
- Several Article 300 section numbers shifted. Underground cover requirements are cited as 300.5 in Minnesota's 2023-NEC inspection checklist and as 300.7 in its 2026 checklist (2023 checklist, items 075–079; 2026 checklist, items 074–078).
- The transformer protection table is Table 450.5(B) in the 2026 NEC, formerly Table 450.3(B) (Electrical Contractor, May 2026).
Tab by the heading you actually see in your book. If a familiar label lands on the wrong number, trust the book.
If your exam uses the 2020 NEC
Use the mounting method above, but locate destinations from your 2020 Contents and Index rather than copying the 2023/2026 numbers. This map wasn't checked against 2020. Washington’s exam page listed the 2020 edition when we checked, so Washington candidates should confirm their edition before choosing tabs. The edition on an exam can switch on a different date than the code in the field: Minnesota’s 2026 code adoption was August 17, while its exam transition was September 8 (DLI’s transition notice).
What your exam allows
Tab rules come from your exam's candidate bulletin and testing authority, not from NFPA’s code-book publishing role. They also differ between states that use the same test vendor: Texas and Washington both test through PSI and have different tab rules (Texas bulletin; Washington rules).
Rules checked September 29, 2026. These five are examples, not a national rule.
| Exam | NEC edition | Your own book? | Tabs | Notes and highlighting | Source |
|---|---|---|---|---|---|
| Texas electrician (TDLR / PSI) | 2026, from Sept. 1, 2026 | Yes. Any soft-bound edition; no loose-leaf, spiral, ring-bound, or NEC Handbook. | Only permanent index tabs manufactured or provided by the NEC publisher. Homemade, DIY, and "non-NEC" tabs are not permitted. | Highlighting, underlining, and notes are allowed before the exam. Nothing may be written or marked during it. No added paper, including taped or stuck-on sheets. | PSI bulletin, p. 8 |
| Washington electrician (L&I / PSI) | Exam page lists the 2020 edition | Yes | Index tabs are fine if they can't be removed | Highlighting and underlining only. No handwritten notes or sticky notes; the proctor checks books. | L&I, "What to bring" |
| ICC National Certification and National Contractor exams covered by its general reference rule | Set by each exam's catalog listing | Yes, bound; some exams are excluded or closed-book | Permanently attached tabs: ones that can't come off without destroying the page | Notes in ink or highlighting are allowed. Don't write in references during the exam. | ICC support article |
| Minnesota electrician (DLI) | 2026 | No. DLI provides a soft-cover NEC with no tabs or other aids. | Not applicable | Not applicable | DLI exam guide, p. 4 |
| California General Electrician certification (DIR / CPS HR, delivered by Pearson VUE) | 2023 | No. References appear on screen as searchable PDFs. | Not applicable | Not applicable | Candidate bulletin, p. 10; platform guide, pp. 8–11 |
What happens in Texas if your book doesn't comply? PSI gives you three choices: test without your book, remove the non-compliant tabs yourself, or forfeit the fee and come back another day with a compliant book (PSI bulletin, p. 8).
An admitted book can still be the wrong edition. TDLR’s exam information page lists the 2026 NEC and also permits any soft-bound edition. Its questions follow the adopted edition. An older book gets through the door; it doesn't match the answer key.
If your exam isn't listed
Find the reference-materials and security sections of your bulletin, then answer these five questions:
- Do I bring my own book, or is one supplied?
- Which edition applies on my exam date? Not the newest one, and not the one you already own.
- Which binding and publication are allowed? Code book vs. Handbook; bound vs. spiral or loose-leaf.
- What kind of tabs? Look for "permanent," "removable," "manufactured or provided by the publisher," and "homemade."
- What marks are allowed? Highlighting, notes written before the exam, and marks made during it are separate questions.
If the wording doesn't settle your exact setup, ask the test vendor in writing and keep the reply with your exam paperwork:
I'm taking [exam name] on [date]. My reference is the [publisher], [edition] NEC, [binding]. I plan to use [tab brand/set], which attach [permanently / removably], with [printed / handwritten] labels. The book has [highlighting / notes written before the exam / no marks]. Does this setup meet the current reference-material rules for my exam?
Florida candidates can reach the program’s reference-material list from DBPR’s electrical examinations page.
Practice with your tabs: 12 lookup drills
Original, unofficial practice. These are code-book navigation drills, not exam questions, and they don't predict a score.
Time each lookup in your own book, then reveal the answer. Aim for the right heading, not just the right neighborhood.
TD-01 · Definitions
Find: Where the NEC defines "continuous load."
Show answer for TD-01
Answer and explanation: Article 100, both editions. Definitions live in Article 100. A page that merely uses the term isn't the destination. Land on the definition itself and read its exact wording. (NEC Style Manual, §2.1; NFPA edition crosswalk, 2023 and 2026 columns)
TD-02 · Load calculations by edition
Find: The article that holds branch-circuit, feeder, and service load calculations in your edition. Check the title page first.
Show answer for TD-02
Answer and explanation: Article 220 in the 2023 NEC; Article 120 in the 2026 NEC. If your "Load calcs" tab opens to Article 220 in a 2026 edition, it's wrong. (NFPA edition crosswalk, 2023 and 2026 columns; NFPA’s dwelling-load demonstration)
TD-03 · The ampacity table
Find: The table of allowable ampacities for insulated conductors with not more than three current-carrying conductors in a raceway or cable, based on an ambient temperature of 30°C (86°F).
Show answer for TD-03
Answer and explanation: Table 310.16, both editions. It sits in Article 310, not in Chapter 9, so a "Chapter 9 tables" tab won't get you there. Read the column headings and notes before using a value. (MN 2026 inspection checklist; MN examination guide, “Formulas and sample calculations”; Southwire technical notes, note 1)
TD-04 · Equipment grounding conductor size
Find: The table used to select the minimum wire-type equipment grounding conductor for a circuit protected by a 60 A breaker.
Show answer for TD-04
Answer and explanation: Table 250.122, both editions. Its input is the overcurrent device rating or setting. Don't mix it up with Table 250.66, which starts from the largest ungrounded conductor size or equivalent area for parallel conductors. Find the table; this drill does not ask you to choose a conductor size. (NFPA grounding and bonding fact sheet, pp. 2–6)
TD-05 · Grounding electrode conductor size
Find: The general table used to size a grounding electrode conductor connected to a metal underground water-pipe electrode. The AC service has 3/0 AWG copper ungrounded service conductors.
Show answer for TD-05
Answer and explanation: Table 250.66, both editions. Here the input is the size of the largest ungrounded conductor, the opposite trap from TD-04. Section 250.66(A) through (C) has electrode-specific provisions; the table is not a universal answer for every electrode connection. (NFPA grounding and bonding fact sheet, pp. 2–6)
TD-06 · Box fill
Find: The section on how many conductors a box may hold, and the table for standard metal boxes.
Show answer for TD-06
Answer and explanation: Section 314.16; Table 314.16(A), both editions. Go from the Boxes tab (Article 314) to the section. Devices, clamps, and grounding conductors add volume allowances under 314.16(B), so the metal-box table alone doesn't finish a box-fill problem. (MN 2026 inspection checklist; MN examination guide, “Formulas and sample calculations”)
TD-07 · Burial depth
Find: The minimum cover requirements for direct-buried cable and conduit.
Show answer for TD-07
Answer and explanation: 2023 NEC: Section 300.5. 2026 NEC: Section 300.7. This section number moved, so a 2023 section-level tab points to the wrong place in a 2026 book. (MN 2023 inspection checklist; MN 2026 inspection checklist)
TD-08 · No tab? Use the Index
Find: Without starting from the Services tab, use the Index to locate the rules for the service disconnecting means.
Show answer for TD-08
Answer and explanation: Section 230.70, both editions. Confirm you're inside Article 230. Index wording varies between editions, so try "service" or "disconnecting means" and follow the reference. The Index is your route to anything that doesn't have its own tab. (MN 2026 inspection checklist; IAEI, “How to Use the NEC”)
TD-09 · Dwelling lighting load
Find: The section giving the minimum general lighting unit load for a dwelling-unit feeder or service calculation, not the separate branch-circuit calculation.
Show answer for TD-09
Answer and explanation: Section 220.41 in the 2023 NEC; Section 120.41 in the 2026 NEC. The section moved with the rest of the load calculations, and the 2026 unit load itself was revised. Read the value from your own edition rather than from memory. (NFPA’s dwelling-load demonstration)
TD-10 · Motor full-load current
Find: The full-load current of a three-phase AC motor from the NEC tables.
Show answer for TD-10
Answer and explanation: Table 430.250, both editions (single-phase motors are in Table 430.248). For motors covered by the general rule in 430.6(A)(1), motor branch-circuit conductor sizing uses the table value rather than nameplate current. Read that section’s exceptions before applying it. (MN examination guide, “Formulas and sample calculations”)
TD-11 · Transformer protection
Find: The table of maximum overcurrent protection for transformers rated 1000 V or less.
Show answer for TD-11
Answer and explanation: Table 450.3(B) in the 2023 NEC; Table 450.5(B) in the 2026 NEC. Renumbered in 2026, so check your edition. (Electrical Contractor, May 2026)
TD-12 · Conduit fill
Find: The shortcut tables showing how many conductors of the same size and insulation fit in a given conduit longer than 24 inches.
Show answer for TD-12
Answer and explanation: Annex C, both editions. If the conductors are different sizes or have different insulation types, work it out from Chapter 9 Tables 1, 4, and 5 instead. Annex C is an informative lookup aid; read the Chapter 9 conditions that apply. (MN examination guide, “Formulas and sample calculations”)
After the drills: Redo any lookup that landed on the wrong heading, got stuck behind overlapping labels, or relied on an old-edition number. Fix the cause first: a misplaced tab, a missing Index habit, or the wrong edition. Twelve drills tell you about these twelve lookups, not your readiness for an exam.
Fix crowded, misplaced, or unreadable tabs
| Problem | Fix |
|---|---|
| Labels hide one another | Stop adding tabs. Re-plan the staircase, move table tabs to their own column, or drop low-use destinations. |
| A tab opens a page before or after the heading | Check both sides of the leaf and your Contents. Don't yank a permanent tab: follow the maker's instructions. |
| Adhesive or a label covers text | Make sure section numbers and text on both sides of the page are still readable. If they aren't, the tab is in the wrong spot. |
| A tab is damaged or missing | Use the Index to reach that destination for now. Don't patch it with tape or a handwritten label if your exam bans them. |
Quick answers
Can I use sticky notes or Post-it flags? Not under the tab rules listed here. Washington and the covered ICC exams require non-removable tabs, and Texas allows only publisher tabs (Washington; ICC; Texas).
Can I write labels on my own tabs? Not where handwritten notes are banned, as in Washington. ICC allows notes in ink for exams covered by its general reference rule. Texas bans homemade and DIY tabs outright. If your publisher set includes blank tabs, get your test vendor's written OK before labeling them for a Texas exam (Washington; ICC; Texas).
Is a pre-tabbed, pre-highlighted book allowed? Only if every tab and mark meets your bulletin. In Texas, the tabs still have to be made or provided by the NEC's publisher (PSI bulletin, p. 8).
Should I highlight too? Only where your bulletin allows it, and only before exam day. Texas, Washington, and ICC exams covered by its general reference rule allow highlighting (Texas; Washington; ICC).
My test center supplies the book. Is tabbing pointless? Your own tabbed copy will not be used on exam day in the Minnesota and California examples above. Practice finding things with the Contents and Index in an unmarked copy for Minnesota. For California General Electrician certification, practice PDF searching as well; the official platform guide describes the search icon and Ctrl+F (Minnesota guide, p. 4; California platform guide, pp. 8–11). Search using the Code’s own terms, such as “equipment grounding conductor,” rather than relying only on informal wording such as “ground wire.”
Sources
- PSI, Texas Electrician Candidate Information Bulletin. Cover and p. 8, “Examination Reference Material List”; 2026 NEC examination transition effective September 1, 2026.
- TDLR, Electrician Exam Information. “Reference Materials.”
- Washington L&I, Electrical Examination. “What to bring”; also the linked PSI bulletin, “Reference Materials.”
- ICC Support, “What should I bring to the test site?”. Updated November 10, 2025; includes exclusions from the general reference rule.
- Minnesota DLI, Electrical license examination guide. “General” and “Formulas and sample calculations”; DLI edition-transition notice.
- California Electrical Certification Candidate Information Bulletin. “California General Electrician,” p. 10; official examination-platform guide, pp. 8–11, for on-screen references and PDF searching.
- NFPA, NEC Restructure (2023–2029). The map uses its 2023 and 2026 columns, not its proposed 2029 organization.
- NFPA’s dwelling-unit load-calculation demonstration. Distinguishes 2023 §220.41, 2026 §120.41, and the separate 2026 branch-circuit calculation in §120.13.
- Minnesota DLI, 2023 NEC inspection checklist and 2026 NEC inspection checklist. Referenced items support navigation locations, not a complete installation design.
- NFPA, “Grounding and Bonding: Using the Tables in Article 250”. June 2020 fact sheet hosted by the City of Salinas; pp. 2–6 explain the different purposes and inputs of Tables 250.66, 250.102(C)(1), and 250.122. Read any current table conditions in the edition you use.
- Electrical Contractor, “Safeguarding Transformers and Conductors”. Mark C. Ode, May 15, 2026; identifies 2026 Table 450.5(B).
- NFPA, NEC Style Manual (2023). §2.1, code organization and numbering; IAEI, “How to Use the NEC”, Contents and Index navigation.
- Southwire conductor technical notes. Note 1 expressly identifies 2023 NEC Table 310.16; used for that navigation reference.
By Castleport Test Prep Editorial Team. Exam reference rules and the edition relocations cited here were checked September 29, 2026. The tab map, drills, and mounting method are editorial recommendations, not an official standard. This guide covers book navigation, not electrical installation decisions.
AI assistance was used in preparing and auditing this resource. No qualified professional review is claimed. Read our editorial standards or report a correction.
Castleport Test Prep is an independent exam prep publisher. We're not affiliated with, endorsed by, or approved by NFPA, PSI, Pearson VUE, CPS HR Consulting, ICC, TDLR, Washington L&I, Minnesota DLI, California DIR, or any tab manufacturer. Code, exam, and credential names are used to identify their subjects; trademarks belong to their respective owners. Our drills are original and unofficial. Following this guide doesn't guarantee your book will be admitted. Your bulletin and test vendor decide.