- Why the HI-JE Content Blueprint Matters
- Exam Format and Scoring Mechanics
- Domain Weighting: The Official Question Allocation
- The Big Four: Domains 1-4
- Mid-Weight Domains: 5, 6, and 7
- Lighter-Weighted Domains: 8, 9, and 10
- Scheduling Study Time by Domain Weight
- Who Sits This Exam and Why the Domains Matter
- Frequently Asked Questions
- The HI-JE exam has 10 domains, but only three weight tiers: 10, 6, and 4 questions each.
- Domains 1-4 (General Electrical Knowledge, Service/Feeders/Branch Circuits, Grounding and Bonding, Conductors and Cables) make up 40 of 70 scored questions.
- The exam is open book with the 2020 NEC supplied at the testing center - no personal code books allowed.
- 70 scored questions plus up to 10 unscored pretest items, 180 minutes, 70% passing score, administered by PSI.
Why the HI-JE Content Blueprint Matters
Every candidate preparing for the Journey Worker Electrician (EJ) license examination in Hawaii - the credential this site refers to by the identifier HI-JE - eventually asks the same question: what exactly is being tested, and how much of my study time should go to each topic? The Hawaii Board of Electricians and Plumbers, operating under the DCCA Professional and Vocational Licensing Division, publishes an official content outline through its testing provider, PSI Services LLC. That outline breaks the exam into 10 named domains, each with a fixed share of the 70 scored questions.
Unlike vague "study everything" advice, the HI-JE blueprint is a precise map. It tells you that four domains carry heavy weight, three carry moderate weight, and three carry lighter weight - and that math should directly shape your prep schedule. This guide walks through all 10 domains in the order the Board weights them, explains what each one actually covers on test day, and shows how the allocation should influence how you spend your limited study hours before your two-year eligibility window closes.
Exam Format and Scoring Mechanics
Before diving into content, it helps to understand the shape of the test itself. The HI-JE exam is a computer-based examination delivered at PSI test centers. Candidates face 70 scored questions plus up to 10 additional unscored experimental questions mixed in without identification - you won't know which ones count toward your score. Time spent specifically on the experimental questions is excluded from the stated 180-minute examination time, so the working clock is effectively built around the 70 scored items.
The exam is open book, but only in a controlled sense: the testing center supplies a copy of the 2020 National Electrical Code, and that is the only code reference permitted. Personal reference books, tabbed code books you've marked up at home, and any other outside study material are not allowed in the exam room. PSI also provides an on-screen calculator, though candidates may bring their own silent, battery-operated, nonprogrammable, nonprinting calculator without an alphabetic keyboard if they prefer physical buttons.
A passing score is 70%. The exam fee is $95 per attempt, separate from the $40 application fee charged by DCCA. If you fail, you cannot rebook for the same day; a retest may be scheduled within two business days depending on seat availability. For the full fee structure across application, testing, and renewal, see the HI-JE Certification Cost 2026 breakdown.
Key Takeaway
Because the code book is supplied and not your own, practice navigating an unmarked, unfamiliar 2020 NEC - tab discipline and article-number memory matter more than annotation habits you might use at home.
Domain Weighting: The Official Question Allocation
The Board's official content outline assigns exact question counts to each of the 10 domains. These numbers add up to the full 70 scored questions and represent the only weighting you need to plan around - everything else is noise.
| Domain | Content Area | Scored Questions |
|---|---|---|
| 1 | General Electrical Knowledge | 10 |
| 2 | Service, Feeders, and Branch Circuits | 10 |
| 3 | Grounding and Bonding | 10 |
| 4 | Conductors and Cables | 10 |
| 5 | Raceways and Boxes | 6 |
| 6 | Special Occupancies, Conditions, and Equipment | 6 |
| 7 | Electrical Power, Motors, and Equipment for General Use | 6 |
| 8 | Low Voltage and Communication Circuits | 4 |
| 9 | Lighting | 4 |
| 10 | Safety Information | 4 |
Notice that the first four domains together account for 40 of the 70 scored questions - more than half the exam. That single fact should anchor your entire preparation timeline. If you're weighing whether the exam is difficult given this concentration, the How Hard Is the HI-JE Exam? guide digs into that question directly, and HI-JE Pass Rate 2026 discusses what the available data shows about outcomes.
The Big Four: Domains 1-4
These four domains are where a passing score is won or lost. Each is weighted identically at 10 questions, and together they represent the backbone of journey-level electrical knowledge in Hawaii.
Domain 1: General Electrical Knowledge
This domain covers the foundational concepts that underlie every other topic on the exam - basic electrical theory, Ohm's Law calculations, circuit fundamentals, and the structure of the NEC itself (how articles, tables, and definitions are organized and cross-referenced).
- Comfort locating definitions in NEC Article 100 quickly
- Basic Ohm's Law and power formula calculations under time pressure
- Understanding NEC numbering conventions so you can navigate the supplied code book efficiently
Domain 2: Service, Feeders, and Branch Circuits
This is the practical heart of residential and commercial wiring work: sizing services, calculating feeder and branch circuit loads, and applying demand factors correctly.
- Service entrance sizing and clearance requirements
- Feeder and branch circuit load calculations, including demand factors
- Overcurrent protection coordination for services and feeders
Domain 3: Grounding and Bonding
Grounding and bonding questions test whether candidates understand the difference between the two concepts and can apply sizing tables correctly - a frequent source of confusion even for experienced field electricians.
- Grounding electrode conductor and grounding electrode system requirements
- Equipment grounding conductor sizing using NEC tables
- Bonding requirements for metal piping, enclosures, and equipment
Domain 4: Conductors and Cables
This domain focuses on conductor identification, ampacity, insulation types, and the various cable assemblies permitted under the code, along with correction and adjustment factors.
- Ampacity tables and derating for temperature and conductor bundling
- Conductor insulation types and their permitted applications
- Cable types (NM, MC, SE, USE) and their installation restrictions
Mid-Weight Domains: 5, 6, and 7
These three domains each carry 6 scored questions - meaningful, but secondary to the Big Four. They tend to reward candidates who have real field exposure to varied job types.
Domain 5: Raceways and Boxes
Covers conduit fill calculations, box sizing, and the specific installation rules for different raceway types used across residential and commercial jobs.
- Conduit and tubing fill percentages and trade size selection
- Box and enclosure sizing based on conductor count and volume
- Support spacing and bend limitations for common raceway types
Domain 6: Special Occupancies, Conditions, and Equipment
This domain tests knowledge of the NEC's special-condition articles - hazardous locations, wet or damp environments, and other occupancy classifications that carry unique installation requirements.
- Classification of hazardous (classified) locations
- Wiring methods required in damp, wet, and corrosive environments
- Equipment listing and marking requirements for special conditions
Domain 7: Electrical Power, Motors, and Equipment for General Use
Focuses on motor circuit calculations, disconnecting means, and general-use equipment provisions that show up regularly on commercial service calls.
- Motor branch circuit and feeder conductor sizing
- Motor overload and short-circuit protection requirements
- Disconnecting means location and rating rules
Lighter-Weighted Domains: 8, 9, and 10
The final three domains each carry only 4 scored questions apiece, but skipping them entirely is a mistake - 12 combined questions is enough to swing a borderline score below the 70% passing threshold.
Domain 8: Low Voltage and Communication Circuits
Covers the code requirements for signal, communication, and low-voltage wiring that increasingly overlap with standard residential and commercial electrical work.
- Separation requirements between low-voltage and power conductors
- Classifications of Class 1, 2, and 3 remote-control and signaling circuits
- Communication circuit protection and grounding basics
Domain 9: Lighting
Tests lighting circuit design, fixture installation clearances, and control requirements found throughout the NEC's lighting-specific articles.
- Lighting outlet and switch location requirements
- Fixture clearance rules near combustible material and in closets
- Track lighting and recessed fixture installation provisions
Domain 10: Safety Information
Rounds out the exam with general workplace and installation safety provisions - the kind of knowledge that underpins every task a journey worker performs in the field.
- Working space and clearance requirements around electrical equipment
- Lockout and de-energization principles referenced in the NEC
- Personal protective equipment considerations tied to code-required clearances
Scheduling Study Time by Domain Weight
Once you know the question allocation, the smartest move is to let it dictate your calendar rather than studying domains in numerical order out of habit. A weighted schedule spends the most hours where the most points live, then tapers off for the lighter domains near the end.
Domains 1-2
- General Electrical Knowledge fundamentals and NEC navigation drills
- Service, feeder, and branch circuit load calculations, timed practice
Domains 3-4
- Grounding and bonding sizing tables, repeated until automatic
- Conductor ampacity, derating factors, and cable type comparisons
Domains 5-7
- Raceway fill and box sizing problem sets
- Special occupancy classifications and motor circuit calculations
Domains 8-10
- Low voltage separation rules and lighting clearance requirements
- Safety information review and full-length mixed practice exams
This structure mirrors the logic covered in more depth in the HI-JE Study Guide 2026, and running full-length practice sessions on the main practice test platform during weeks 5 and 6 helps confirm whether your weighted-time approach is translating into real accuracy across all 10 domains, not just the heavy ones.
Who Sits This Exam and Why the Domains Matter
Candidates sitting the Journey Worker Electrician (EJ) exam have already logged five years of qualifying residential or commercial wiring experience totaling at least 10,000 hours, plus 240 hours of electrical academic coursework accepted by a University of Hawaii community college program. That real-world background is precisely why the domain weighting looks the way it does: General Electrical Knowledge, Service/Feeders/Branch Circuits, Grounding and Bonding, and Conductors and Cables are the topics a working apprentice encounters on nearly every job, while Low Voltage, Lighting, and Safety Information tend to come up less frequently or in more specialized scopes of work.
It's worth being clear about what passing this exam does and doesn't unlock. Earning the EJ license certifies you as a journey-level electrician in Hawaii - it does not by itself authorize electrical contracting, and Hawaii has no reciprocity agreement that lets an out-of-state electrician license substitute for this exam. If you're still confirming eligibility before you schedule, the full breakdown of experience, coursework, and verification requirements lives in the HI-JE Requirements 2026 guide. For a broader look at where this license fits your career and whether the investment pays off, see Is the HI-JE Certification Worth It? and HI-JE Salary Guide 2026.
Once you're confident across all 10 domains, a quick final review the night before using something like the HI-JE Cheat Sheet 2026 can reinforce the sizing tables and definitions that are easiest to mix up under time pressure. And if scheduling logistics - testing windows, retest timing, renewal cycles - are still unclear, the HI-JE Exam Dates 2026 article covers that ground separately from content prep.
Frequently Asked Questions
There are 10 domains. Four carry 10 questions each (General Electrical Knowledge, Service/Feeders/Branch Circuits, Grounding and Bonding, and Conductors and Cables), three carry 6 questions each, and three carry 4 questions each, totaling 70 scored questions.
Start with General Electrical Knowledge and Service, Feeders, and Branch Circuits since together with Grounding and Bonding and Conductors and Cables they make up 40 of the 70 scored questions - more than half the exam.
You can study with any 2020 NEC copy, but you cannot bring it into the testing center. PSI supplies the 2020 National Electrical Code at the test site, and personal reference books are not permitted.
Yes. Together those three domains account for 12 of the 70 scored questions, which is enough to move a borderline score above or below the 70% passing threshold.
The up to 10 unscored experimental questions are not part of the official 10-domain weighting or your score. Time spent on them is also excluded from the stated 180-minute exam time.