1.4 Official References, Open-Book Rules, and Calculators
Key Takeaways
- Exam questions and appeals are based on the approved references listed in the current ICC exam catalog.
- Open-book access helps only if your references are organized, familiar, and allowed under current test rules.
- Computer-based ICC contractor/trades exams generally allow copyrighted bound material with ink notes, highlighting, and permanently attached tabs, while loose papers are prohibited.
- Calculator policies require nonprogrammable devices that cannot store exam information, with stricter PRONTO limits for remote delivery.
Approved references control the answer
For ICC contractor/trades exams, the approved references are listed in the Exam Catalog. Exam questions come from those listed references, and appeals are based on those listed references. That means your favorite field handbook, apprenticeship worksheet, YouTube shortcut, or local company standard may be useful for learning, but it is not the authority for the exam unless it is listed.
For the journeyman electrician track, the NEC edition is the center of gravity. R17-N uses the 2023 NEC, T17-N uses the 2020 NEC, and G17-N uses the 2017 NEC. R17-N and T17-N also reference International Codes in the source brief. The exact catalog page for your exam version should be checked before registration because administration details can change.
Open book is a skill
Open book can mislead candidates. It sounds like you can look up everything. The ICC bulletin warns that candidates will not have time to look up every answer. In a 4-hour, 80-question exam, you must know the shape of the NEC before the clock starts.
A strong reference system has three layers:
| Layer | Purpose | Example |
|---|---|---|
| Memory map | Know where topics live | Services in 230, branch circuits in 210, motors in 430. |
| Index skill | Find unfamiliar terms fast | Look up demand factor, ampacity, bonding jumper, or receptacle. |
| Rule verification | Read the controlling condition | Check notes, exceptions, table headings, and definitions. |
What may be allowed
The source brief states that computer-based exams generally allow copyrighted bound material with ink notes, highlighting, and permanently attached tabs. Loose papers are prohibited. Calculator rules generally require a battery-operated, nonprogrammable calculator that cannot store examination information and has no ribbon or paper printing.
PRONTO remote testing has stricter environment rules in the brief. It allows a basic four-function nonprogrammable calculator and prohibits loose papers, writing utensils, smart watches, external monitors, and any second monitor or screen. If you use PRONTO or any remote option, check current rules before assuming the same setup as a test center.
| Item | General rule from source brief | Study action |
|---|---|---|
| Bound reference | Generally allowed if copyrighted and bound | Use the approved NEC edition and listed references. |
| Ink notes | Generally allowed | Keep notes short and code-navigation focused. |
| Highlighting | Generally allowed | Highlight headings, table titles, and common exceptions. |
| Permanent tabs | Generally allowed | Use durable tabs for major article groups. |
| Loose paper | Prohibited | Do not build a system that depends on loose sheets. |
| Calculator | Nonprogrammable, no stored exam information | Practice with the exact style you will bring or use. |
Good notes versus bad notes
Good exam notes speed navigation. Bad notes create clutter. A margin note that says see Table 310.16 conditions may help. A full copied rule is slower to scan and may violate test-center interpretation if it looks like loose inserted study material or an attempt to store exam information outside normal notes.
Use notes for routes, not essays:
210 branch circuits: ratings, required outlets, GFCI/AFCI, loads.230 services: conductors, disconnects, overcurrent, grounding.250 grounding/bonding: definitions first, then system rule.Chapter 9: raceway fill, conductor properties, notes matter.430 motors: table FLC may differ from nameplate for calculations.
NEC navigation practice
A useful code-navigation drill has four steps. First, identify the noun in the question. Second, identify the condition. Third, locate the article or table. Fourth, verify whether an exception or note changes the result.
Example route:
| Prompt clue | Navigation step |
|---|---|
| Branch-circuit conductor ampacity | Start in Article 210 for branch-circuit context. |
| Conductor size and insulation | Move to Article 310 and ampacity tables. |
| More than three current-carrying conductors | Check adjustment factors. |
| Ambient temperature given | Check correction factors. |
| Final answer asks overcurrent size | Confirm Article 240 rules if needed. |
Do not memorize only numbers. Memorize paths. The exam may change the wording, but the path remains usable.
Calculator discipline
Electrical calculations are often simple arithmetic with strict setup. The calculator does not decide which load factor, ampacity column, conductor count, or overcurrent rule applies. It only executes the math after you choose the rule.
Practice writing compact setups on the provided testing material if allowed at your delivery method. For PRONTO, the brief says writing utensils and loose papers are prohibited, so you must understand the permitted on-screen or remote workflow before test day.
Common setup formats:
watts = volts x amperes
amperes = watts / volts
single-phase VA = volts x amperes
three-phase VA = volts x amperes x 1.732
adjusted ampacity = table ampacity x correction factor x adjustment factor
Exam trap: using a book that is good but not listed
Many electricians own excellent references. The exam does not grade excellence in general. It grades the listed sources. If a practice explanation cites a newer NEC, a local amendment, or a manufacturer guide, ask whether that source is approved for your exam. If not, use it only as background and return to the approved reference for the answer.
Source control is not paperwork. It is how you keep an open-book exam from becoming an open-confusion exam.
For ICC contractor/trades exams, where should a candidate look to identify approved references?
Which reference setup is generally consistent with the source brief for computer-based ICC contractor/trades exams?
What is the best use of margin notes in an approved NEC reference?