- How the Ten Domains Are Defined (and What They Are Not)
- Exam Format and Logistics That Shape Your Preparation
- Domain 1: Safety Requirements
- Domains 2-4: Vehicle Fundamentals, Electrical Theory and Components
- Domains 5-6: Motor Theory and Testing Fundamentals
- Domains 7-9: Batteries, Energy Delivery and Charging
- Domain 10: BEV Maintenance and Troubleshooting
- All Ten Domains at a Glance
- Sequencing Your Study Across the Domains
- Availability and Source Caveats to Check First
- Frequently Asked Questions
- ETA International's Electric Vehicle Technician competency document lists exactly ten categories of knowledge, from Safety Requirements through BEV Maintenance...
- No percentage weights are published for the ten domains, so do not trust any site that claims exact domain weightings.
- ETA's catalog lists a 75% passing score, plus a separate 100% requirement on the safety portion.
- The written exam is only half the credential: ETA also requires a hands-on assessment through an approved school.
How the Ten Domains Are Defined (and What They Are Not)
The Electric Vehicle Technician (EVT) credential from ETA International (Electronics Technicians Association, International) covers maintenance, service and troubleshooting of battery-electric vehicles. Its content outline comes from ETA's published Electric Vehicle Technician competency requirements, which organize the knowledge base into ten categories. ETA states that examination questions derive from the competencies listed under those categories.
Two caveats matter before you build a study plan around the domains:
- The domains are official competency categories, not editorial allocations. ETA's competency document does not publish percentage weights, so you cannot say that Batteries is worth a fixed share of the exam. Anyone quoting a precise breakdown is inventing it.
- The competency document is not a 2026 syllabus. The version we rely on carries a September 20, 2012 revision date (copyright 2013). It references historical NFPA and NEC editions, and those should not be read as current 2026 code requirements. Use it as the official map of topics, then verify specifics with ETA and your approved training provider.
Exam Format and Logistics That Shape Your Preparation
ETA's currently linked Certification Catalog lists the following written-exam parameters for the EVT:
| Item | What the catalog states |
|---|---|
| Written exam fee | US$205 (ETA Press's separate listing shows US$200; confirm the current fee with ETA) |
| Questions | 100 |
| Time allowed | Two hours (applies to the written exam, not the practical assessment) |
| Passing score | 75%, with a separate 100% requirement on the safety portion |
| Hands-on assessment | Mandatory |
| Certification term | Four years |
The safety threshold is a passing criterion, not a domain weight. That distinction is important: you can score well on everything else and still fall short if you miss the safety requirement. Our EVT passing score guide walks through how those two thresholds interact.
Format conflicts to be aware of
An older ETA program update from December 2012 described 75 knowledge questions, 30 separate safety questions and 46 practical tasks. Do not blend those historical counts with the catalog's 100-question figure, and do not treat 46 tasks as a verified current practical count. Likewise, ETA Press's listing mentions one free retake after a 30-day wait within one year of the first attempt, while the catalog does not describe it. Confirm retake conditions directly with ETA before you rely on them.
Test-day mechanics
- Written testing is proctored by an ETA Certification Administrator, via Trapeza online testing or paper and pencil.
- ETA-approved schools administer the required written and hands-on components.
- Photo identification is required.
- Scratch paper and a non-programmable scientific calculator are permitted; used scratch paper must be surrendered, and phones are prohibited.
- Trapeza scores are available immediately.
Because a non-programmable scientific calculator is allowed, expect calculation-style questions in areas like Electrical Theory and Batteries (Ohm's law, power, series and parallel pack arithmetic). Practice with the same type of calculator you will carry in. Cost details are broken down in our EVT certification cost guide, and eligibility is covered in EVT requirements.
Domain 1: Safety Requirements
Domain 1: Safety Requirements
This is the domain with a standalone passing rule. Treat it as pass/fail knowledge rather than a topic you can partially master.
- High-voltage hazards in battery-electric vehicles and the consequences of contact
- Personal protective equipment selection and inspection before use
- De-energizing and isolating a vehicle's high-voltage system before service
- Safe handling practices around battery packs, cabling and charging equipment
- Shop safety procedures and emergency response awareness
Because ETA's catalog requires a 100% result on the safety portion, memorizing the "why" behind each rule is more reliable than memorizing a list. When you understand why a lockout sequence exists, you can answer scenario questions you have never seen before. The hands-on side reinforces this: expect practical assessment of safe working habits, not just recall of rules.
Key Takeaway
Do not leave safety for the final week. Review it first, again at the midpoint, and again the night before. Since the passing rule is absolute, a single sloppy answer here can cost you the whole written attempt.
Domains 2-4: Vehicle Fundamentals, Electrical Theory and Components
These three domains form the conceptual base for everything that follows. Candidates who rush past them tend to struggle when motor, battery and charging questions assume fluent electrical reasoning.
Domain 2: Electric Vehicle Fundamentals
How battery-electric vehicles are organized and how their major systems relate to one another.
- Overall BEV architecture and how energy flows from storage to the wheels
- Differences between BEVs and conventional vehicles that change service practice
- Vocabulary for major high-voltage subsystems
Domain 3: Electrical Theory
The mathematics and principles behind every diagnostic measurement you will take.
- Voltage, current, resistance and power relationships
- Series, parallel and combination circuits
- AC versus DC behavior and why EVs use both
- Magnetism and electromagnetic principles that connect to motors
Domain 4: Electronic Systems Components
Recognizing what individual components do and how they behave in a circuit.
- Common passive and semiconductor components and their functions
- How switching and control devices manage power
- Reading symbols and understanding component roles on a schematic
Calculation practice belongs here. Work problems by hand until series and parallel reasoning is automatic, since Domains 7 through 9 reuse the same logic at higher voltages. You can test yourself on these fundamentals with questions on the main practice test site.
Domains 5-6: Motor Theory and Testing Fundamentals
Domain 5: Motor Theory
How electric motors convert electrical energy to motion in a traction system.
- Core principles of electromagnetic motor operation
- Motor construction concepts and the roles of key parts
- How controllers regulate speed and torque
- Typical failure modes and what they look like electrically
Domain 6: EV Electronics and Testing Fundamentals
The measurement discipline that turns theory into diagnosis.
- Selecting and safely using meters and test equipment on high-voltage systems
- Interpreting readings against expected values
- Insulation and continuity concepts relevant to EV wiring
- Reading schematics and wiring diagrams to plan a test
Domain 6 is where safety and measurement meet. A question might ask not just what a reading means but whether it is safe to take that reading in a given condition. This domain is also the bridge to the practical assessment, where measurement technique is observed rather than described.
Domains 7-9: Batteries, Energy Delivery and Charging
This cluster carries much of the EV-specific content that distinguishes the credential from general electrical certifications. It also aligns with ETA's stated editorial emphasis on battery and power-electronics diagnostics.
Domain 7: Batteries
Understanding the energy storage system at the center of the vehicle.
- Battery chemistry concepts and how cells combine into modules and packs
- Voltage and capacity relationships in series and parallel arrangements
- Battery management and monitoring concepts
- Handling, storage and condition assessment of battery systems
Domain 8: Energy Delivery Systems
How stored energy is converted, distributed and delivered to the vehicle's loads.
- Power conversion and the role of power electronics
- High-voltage distribution, cabling and connectors
- Protection and isolation devices in the energy path
- Auxiliary power delivery to low-voltage systems
Domain 9: Charging
How energy gets into the vehicle and what can go wrong along the way.
- Charging equipment types and how they interface with the vehicle
- Communication and safety interlocks between charger and vehicle
- On-board charging components and their service considerations
- Common charging faults and how to isolate them
Domain 10: BEV Maintenance and Troubleshooting
Domain 10: BEV Maintenance and Troubleshooting
The applied capstone, and the domain closest to daily shop work and to the hands-on assessment.
- Scheduled maintenance tasks specific to battery-electric vehicles
- Systematic fault diagnosis: verify the complaint, isolate the system, test, confirm the repair
- Using the measurement skills from Domain 6 to narrow faults in Domains 7 through 9
- Documenting findings and following service procedures safely
This domain rewards process over memorization. The strongest candidates can narrate their diagnostic logic out loud: what they would test first, what result they expect, and what they would conclude from each outcome. If you are working in a shop, convert every real repair into that narration. For a view of how hard candidates find the combined written and practical demands, read how hard the EVT exam is.
All Ten Domains at a Glance
| Domain | Core focus | Typical skill type |
|---|---|---|
| 1. Safety Requirements | High-voltage hazards, PPE, isolation | Rule application (100% safety requirement) |
| 2. Electric Vehicle Fundamentals | BEV architecture and energy flow | Conceptual recall |
| 3. Electrical Theory | Ohm's law, circuits, AC/DC | Calculation |
| 4. Electronic Systems Components | Component function and symbols | Identification |
| 5. Motor Theory | Electromagnetic motor operation | Conceptual reasoning |
| 6. EV Electronics and Testing Fundamentals | Meters, readings, schematics | Interpretation |
| 7. Batteries | Cells, packs, monitoring | Calculation and concepts |
| 8. Energy Delivery Systems | Power conversion and distribution | Systems reasoning |
| 9. Charging | Charger-vehicle interface | Systems reasoning |
| 10. BEV Maintenance and Troubleshooting | Service and fault diagnosis | Scenario analysis |
The "skill type" column is an editorial reading of how topics tend to be tested, not an official classification. ETA publishes the categories, not question-style breakdowns.
Sequencing Your Study Across the Domains
Order matters because later domains depend on earlier ones. Here is a sequence that respects those dependencies, assuming roughly one domain cluster per week:
Safety plus foundations
- Domain 1 first, so safety logic anchors everything else
- Domain 2 for the big-picture vocabulary
Theory and components
- Domains 3 and 4, with daily hand calculations using a non-programmable scientific calculator
Motors and measurement
- Domains 5 and 6, rehearsing meter technique and schematic reading
The energy pathway
- Domains 7, 8 and 9 studied together as one chain
Application and review
- Domain 10 scenarios, then a full safety review and mixed practice questions
Adjust the pacing to your background, since an experienced electrician may compress Weeks 2 and 3 while a newer technician may need to stretch them. A one-page review sheet helps in the final days; see the EVT cheat sheet.
Availability and Source Caveats to Check First
Before investing in preparation, verify that the pathway is currently open to you. The EVT remains listed in ETA's live catalog, in its course approval application, and in the ETA Master Technician matrix revised May 6, 2026, with no retirement marker. However, ETA's current renewable-energy index omits it, and none of these listings by themselves establish that an approved EVT course or exam is bookable today.
On prerequisites, ETA's stand-alone pathway does not require CETa. Specialized knowledge and hands-on training through an ETA-approved EV school are required, and the issued badge also lists practicing-technician experience, successful written and hands-on examinations, and acceptance of the Code of Conduct. No minimum experience duration is stated. Full details are in EVT requirements.
Once certified, maintenance for the hands-on credential requires six continuing-education contact hours per year (24 over the four-year term), a supervisor-completed Employer Verification Form, the Certification Maintenance Form, and US$25 per year (US$100 over four years). If you are weighing the investment, our ROI analysis separates general occupational earnings from any unverified EVT-specific pay premium, and the salary guide takes the same careful approach. For a refresher on the basics, start with what EVT certification is.
Frequently Asked Questions
ETA's Electric Vehicle Technician competency requirements list ten categories of knowledge: Safety Requirements, Electric Vehicle Fundamentals, Electrical Theory, Electronic Systems Components, Motor Theory, EV Electronics and Testing Fundamentals, Batteries, Energy Delivery Systems, Charging, and BEV Maintenance and Troubleshooting.
No. The competency document does not publish percentage weights. ETA states that exam questions derive from the competencies, but any specific weighting you see elsewhere is not from ETA's published material.
ETA's catalog lists a 75% passing score for the written exam, with a separate requirement of 100% on the safety portion. The two-hour time allowance applies to the written exam, not the hands-on assessment. See our passing score guide for detail.
It is the official topic map, but its revision date is September 20, 2012, and its code references are historical. Use it to organize your study, and confirm current expectations with ETA or an approved school rather than treating it as a 2026 syllabus.
No. ASE L3 is a separate credential from the National Institute for Automotive Service Excellence with its own eligibility and scope. Compare them using ASE's Light Duty Hybrid/Electric Vehicle Specialist test page before deciding which fits your career. You can also find out more about EVT jobs and test your readiness on the practice test site.