Important Oregon licensing fact: Oregon's master-level electrical credential is the General Supervising Electrician (S), not a license officially titled Master Electrician. The S license carries responsible-charge duties including design, planning, layout, permit signing, supervision, and control of electrical service work.
What Is Oregon Master Electrician Contractor Exam Prep?
Oregon Master Electrician Contractor Exam Prep is advanced electrical preparation for experienced electricians moving beyond journey-level installation work and into Oregon's General Supervising Electrician license.
The General Supervising Electrician is the master-level individual credential most closely connected to responsible charge. The licensee may design, plan, and lay out electrical work, sign permits, and is the individual authorized to direct, supervise, or control the installation or alteration of an electrical service.
This is different from the Oregon Electrical Contractor (C) license. The S license belongs to the individual electrician. The C license belongs to the company. For an unrestricted Electrical Contractor business, the General Supervising Electrician serves as the key signing-supervisor credential.
Official master-level credential: General Supervising Electrician (S).
Exam: 64 questions.
Exam structure: 52 code questions + 12 calculation questions.
Time: 4 hours.
Passing score: 75%.
Format: open book.
The 2026 Oregon Master Electrician + Electrician Calculations Study Guides + National Electrical Code Combo is designed for supervising-level code navigation and advanced electrical calculation practice.
Oregon Master-Level Electrical and Contractor Paths
Understand where the General Supervising Electrician fits into Oregon's individual and business licensing structure.
| Path | License Structure | What to Verify |
|---|---|---|
| General Journeyman Electrician (J) | Statewide journey-level individual electrical license | Journeyman qualification, BCD examination, continuing education, and supervised work requirements |
| General Supervising Electrician (S) | Oregon master-level individual electrical license | Journeyman qualification, additional 8,000 journeyman hours, 64-question exam, and responsible-charge duties |
| Limited Supervising Electrician (PS) | Advanced supervising license limited to qualifying plant, hospital, commercial-building, or institutional work | Plant-journeyman qualification, additional experience, scope limits, and 64-question exam |
| Electrical Contractor (C) | BCD company contractor license | Business registration, active CCB license, qualified signing supervisor, and company licensing requirements |
| CCB Contractor License | Oregon construction contractor business license | RMI, endorsement, bond, liability insurance, workers' compensation, and business requirements |
| Reciprocal General Supervising Electrician | Master-level reciprocal individual license | Current reciprocity with Arkansas and Utah, active master/supervisor license, testing history, and Oregon application requirements |
Research Authority and Verification
Current Oregon Building Codes Division licensing information, Oregon Business Xpress, electrical code adoption information, continuing education requirements, contractor rules, and current 1 Exam Prep Oregon Master Electrician products were reviewed for this page.
| Verified Point | Authority | Current Result |
|---|---|---|
| Master-level credential | Oregon Building Codes Division | General Supervising Electrician (S) is Oregon's advanced statewide supervising electrical credential |
| S license scope | Oregon BCD / Business Xpress | Design, plan and lay out work, sign permits, and direct, supervise, or control installation or alteration of an electrical service |
| S examination | Oregon BCD / Business Xpress | 64 questions, 4 hours, open book, with 52 code questions and 12 calculation questions |
| Passing score | Oregon Building Codes Division | 75% or better for Oregon licensing examinations |
| Current Oregon electrical code | Oregon Building Codes Division | 2026 Oregon Electrical Specialty Code effective October 1, 2026 and based on the 2026 NEC |
| Experience requirement | Oregon Building Codes Division | Oregon journeyman qualification plus an additional 8,000 hours of on-the-job journeyman experience |
| Continuing education | Oregon Building Codes Division | 24 hours total: 4 Oregon rule and law, 12 code change, and 8 code related |
Oregon Master Electrician Exam Prep Breakdown
The Oregon General Supervising Electrician examination goes beyond ordinary journeyman code lookup. Current licensing information describes a two-section format with 52 code questions and 12 calculation questions.
The code side rewards fast, accurate use of the NEC, Oregon Electrical Specialty Code amendments, Oregon electrical statutes and administrative rules, services, feeders, branch circuits, conductors, grounding, bonding, wiring methods, equipment, motors, transformers, special occupancies, special equipment, and supervisory responsibilities.
The calculation side demands clean setup and accurate math. Candidates should be comfortable with services, feeders, conductor ampacity, motor loads, transformer calculations, box and raceway fill, overcurrent protection, voltage drop, grounding sizes, and other NEC-based calculations.
Field experience helps, but the test still expects you to prove that you can locate, interpret, calculate, and apply the rule under a clock. Years in the trade are useful. The exam, sadly, does not accept "I've always done it that way" as a code reference.
Primary SEO Target
Oregon Master Electrician Contractor Exam Prep
Official Credential
General Supervising Electrician (S)
Licensing Authority
Oregon Building Codes Division
Exam Questions
64 total
Code Section
52 questions
Calculation Section
12 questions
Exam Time
4 hours / 240 minutes
Passing Score
75%
Exam Format
Open book
Current Oregon Electrical Code
2026 Oregon Electrical Specialty Code
Base Model Code
2026 NFPA 70 National Electrical Code
Experience
Journeyman qualification + 8,000 additional on-the-job journeyman hours
Continuing Education
24 total hours: 4 ORL + 12 code change + 8 code related
Reciprocity
Arkansas and Utah, subject to current Oregon requirements
Exam Prep
View Oregon Master Electrician Exam Prep
How to Study for the Oregon General Supervising Electrician Exam
Prepare for two jobs at once: fast code interpretation and accurate electrical calculations. The current S exam contains a large code section plus a dedicated calculation section.
Code preparation: practice NEC navigation, Oregon amendments, ORS 479, OAR 918, services, feeders, branch circuits, grounding, conductors, wiring methods, equipment, special occupancies, and supervisor responsibilities.
Calculation preparation: work service loads, feeders, conductor ampacity, motors, transformers, overcurrent protection, voltage drop, box fill, raceway fill, and grounding calculations.
Supervisor preparation: understand responsible charge, permit signing, safety oversight, electrical-service supervision, licensed-worker requirements, and code compliance.
Open-book speed: know which reference controls the question before you begin searching. Four hours can disappear surprisingly fast when every lookup becomes a sightseeing tour.
Master-Level Electrical Calculations and Code Strategy
The dedicated calculation section is one of the biggest differences between Oregon's journeyman and supervising-level exam formats. Practice calculations as complete timed problems, not simply as formulas written on a flash card.
Oregon master-level electrical exam-prep illustration for supervising-level NEC calculations and code application.
- Services: calculated load, demand factors, service conductors, neutral calculations, disconnects, and protection
- Feeders: feeder loads, conductor sizing, neutral load, overcurrent protection, and demand
- Conductors: ampacity, temperature limits, correction factors, adjustment factors, parallel conductors, and voltage drop
- Grounding and Bonding: electrode conductors, bonding jumpers, equipment grounding conductors, and separately derived systems
- Motors: full-load currents, branch conductors, overloads, short-circuit protection, feeders, and disconnects
- Transformers: primary and secondary current, conductors, protection, grounding, and transformer-fed systems
- Raceways and Boxes: raceway fill, box fill, pull boxes, conductor counts, and practical installation calculations
Your Oregon Master Electrician Contractor Roadmap
Move from journeyman qualification into the General Supervising Electrician license and then into unrestricted electrical contracting if that is your business goal.
1
Earn or meet Oregon journeyman qualifications
Begin with the General Journeyman Electrician qualification path through an approved apprenticeship or Oregon's accepted education and experience alternatives.
2
Build additional journeyman experience
Document an additional 8,000 hours of on-the-job journeyman electrical experience beyond the journey-level qualification requirements.
3
Submit the General Supervising application
Provide the electrical-license application, experience verification, required education and identity documentation, and other materials requested by BCD.
4
Receive BCD exam authorization
After approval, BCD mails a Letter of Authorization with scheduling information and the approved testing-material list.
5
Prepare for both exam sections
Train separately for the 52-question code portion and the 12-question calculation portion while building four-hour exam stamina.
6
Pass the General Supervising exam
Complete the 64-question open-book examination in four hours and meet Oregon's 75 percent passing requirement.
7
Maintain the S license
Complete 24 hours of required continuing education, including Oregon rule and law, code-change, and code-related education.
8
Qualify an Electrical Contractor company
If operating an unrestricted electrical contracting company, maintain the separate Electrical Contractor (C) company license and an active CCB contractor license. The General Supervising Electrician is the key signing-supervisor credential for that business path.
Oregon Master Electrician Exam Structure and Study Priorities
The exam officially contains 64 questions. Oregon Business Xpress identifies 52 code questions and 12 calculation questions. The topic bars below organize study priorities within those two major sections rather than claiming an unpublished official topic-by-topic question count.
Code Section
52 of 64 questions
Calculation Section
12 of 64 questions
2026 OESC + NEC Navigation
Very High Priority
Services, Feeders + Branch Circuits
Very High
Grounding + Bonding
Very High
Electrical Calculations
Dedicated Section
Conductors + Overcurrent Protection
High
Motors + Transformers
High
Raceways, Boxes + Wiring Methods
High
ORS 479 + OAR 918 + Supervisory Duties
Important
Special Occupancies + Special Equipment
Important
Key difference: the General Supervising exam includes a dedicated calculation section. Do not spend all your study time on code lookups and then introduce yourself to electrical math in the parking lot.
Oregon Master Electrician Exam References
Oregon publishes electrical exam-material guidelines, and your Letter of Authorization provides the list approved for your examination. Always compare your final exam library with the current BCD instructions.
| Reference / Resource | Primary Study Use | Important Note |
|---|---|---|
| 2026 NEC + Oregon Amendments | Electrical code, services, feeders, grounding, conductors, raceways, equipment, motors, transformers, special occupancies, and calculations | 2026 OESC is based on the 2026 NEC |
| National Electrical Code Handbook | Additional NEC explanation and code navigation | Current Oregon electrical exam guidelines list the NEC Handbook among allowed publications |
| ORS Chapter 479 | Oregon electrical statutes and legal responsibilities | Important for supervising-level law and responsibility questions |
| OAR Division 918 | Oregon administrative rules, licensing, electrical requirements, and supervision | Review the provisions that apply to electrical licenses and work |
| American Electrician's Handbook | Electrical theory, practical reference material, and trade calculations | Listed in current Oregon electrical exam-material guidelines |
| Electrical Black Book / Ugly's Electrical References | Formulas, electrical reference data, tables, conversions, and quick trade information | Listed among current Oregon-approved electrical exam publication types |
| Ferm's Fast Finder / Tom Henry's Key Word Index | Faster NEC keyword and article navigation | Listed in current Oregon electrical exam-material guidelines |
How to Prepare for the Oregon Open-Book Master-Level Exam
Build these exam-prep habits
- Read your Letter of Authorization carefully
- Use only current BCD-approved examination materials
- Practice with the 2026 NEC and Oregon amendments
- Review ORS 479 and applicable OAR 918 rules
- Use permitted tabs and highlighting
- Practice calculation problems without relying on prohibited added examples
- Complete four-hour timed exam simulations
Avoid these exam-prep mistakes
- Bringing practice tests into the examination
- Adding class-prep notes to approved books
- Adding calculation examples to exam references
- Adding extra pages to books
- Using unauthorized electronics
- Assuming every helpful book is automatically approved
- Spending most of your four hours on the code section and rushing the calculations
Current Oregon reference-marking guidance: approved materials may use commercial or self-generated tabs, highlighting, and limited handwritten side-margin references that point to another code section or a state or local amendment. Practice tests, class-prep materials, calculation examples, and added pages are not permitted.
Oregon Master Electrician vs General Supervising Electrician
Oregon does not officially call the license "Master Electrician." The advanced statewide electrical credential is General Supervising Electrician.
The terminology matters because your application, examination authorization, license record, and contractor paperwork use the official S classification.
The General Supervising Electrician may design, plan, and lay out electrical work, sign permits, and direct, supervise, or control electrical-service installation or alteration.
The S license also has an important contractor connection. Oregon's unrestricted Electrical Contractor (C) is a separate company license. The contracting company must satisfy BCD and CCB business requirements and designate the appropriate signing supervisor. The General Supervising Electrician is the qualifying signing-supervisor license for unrestricted electrical contracting.
So when people search for Oregon Master Electrician Contractor Exam Prep, they are usually talking about preparation for the S license and the advanced responsibilities that come with it.
Oregon Electrical License and Contractor Comparison
The Oregon master-level path adds authority, responsibility, experience, calculations, and supervision beyond the General Journeyman license.
| Credential | Main Purpose | Important Difference |
|---|---|---|
| General Journeyman Electrician (J) | Perform general electrical installation work under required supervision | Journey-level individual license with a 52-question, 3-hour exam |
| General Supervising Electrician (S) | Design, plan, lay out, sign permits, and direct or supervise electrical-service work | Master-level individual license with 64 questions, four hours, and a dedicated calculation section |
| Limited Supervising Electrician (PS) | Supervise qualifying electrical work in plants, hospitals, commercial buildings, or institutions | Advanced license with a limited scope compared with the General Supervising license |
| Electrical Contractor (C) | Allow a company to engage in the business of making electrical installations | Company license, not the individual master-level electrical credential |
| CCB Contractor License | Meet Oregon construction-contractor business licensing requirements | Required separately for contractors performing electrical work |
| Reciprocal General Supervising Electrician | Reciprocal master-level licensing route | Current reciprocity agreements are with Arkansas and Utah |
Oregon General Supervising Electrician Requirements
Journey-Level Foundation
Build the Required Base License
- Qualify for the Oregon General Journeyman Electrician license
- Complete required electrical education and experience
- Pass the journeyman examination where required
- Maintain verifiable work history
- Work within Oregon supervision requirements
- Build broad residential, commercial, and industrial knowledge
General Supervising Candidate
Oregon Master-Level Path
- Hold an Oregon Journeyman Electrician license or meet its qualification standards
- Document an additional 8,000 hours of on-the-job journeyman experience
- Follow Oregon's applicable experience-credit rules
- Submit required experience verification
- Receive authorization from BCD
- Pass the 64-question General Supervising examination
Electrical Contractor Business
Separate Company Licensing
- Register the business name as required
- Maintain an active Oregon CCB license
- Apply for the BCD Electrical Contractor (C) company license
- Designate a General Supervising Electrician signing supervisor
- Meet CCB bond and insurance requirements
- Maintain all contractor and business renewal requirements
Experience reminder: Oregon's current S requirements call for an additional 8,000 hours of on-the-job journeyman experience after meeting the journeyman qualification standard. If qualifying through an alternative experience route, Oregon's 300 percent rule can apply.
Six-Week Oregon Master Electrician Exam Prep Plan
Build supervising-level code skill, calculation accuracy, Oregon law knowledge, and four-hour exam endurance.
Week 1
Oregon S Exam Setup
- Review exam format
- Verify authorized references
- Review 2026 OESC amendments
- Review ORS 479 and OAR 918
- Take a diagnostic exam
Week 2
Services + Feeders
- Service calculations
- Demand factors
- Feeder calculations
- Neutral loads
- Overcurrent protection
Week 3
Conductors + Grounding
- Ampacity
- Correction and adjustment
- Grounding electrodes
- Bonding
- Separately derived systems
Week 4
Motors + Transformers
- Motor conductor sizing
- Overloads
- Motor feeders
- Transformer calculations
- Protection and grounding
Week 5
Special Systems + Supervisor Rules
- Special occupancies
- Special equipment
- Raceways and boxes
- Permit and supervision duties
- Oregon electrical law and rules
Week 6
Full Four-Hour Simulation
- 52 code questions
- 12 calculation questions
- Four-hour total window
- Review every missed question
- Repeat slow code and math problems
How Hard Is the Oregon General Supervising Electrician Exam?
The Oregon General Supervising Electrician exam is harder than the journeyman exam because it adds deeper supervisory responsibility and a dedicated calculation section.
You have four hours for 64 questions, or an average of about 3.75 minutes per question. The questions are not all equal, though. A straightforward code lookup may take under a minute, while a calculation can happily eat five or ten minutes if you lose track of the setup.
Open book helps only if your references are organized and familiar. Strong candidates know where the likely rule lives before opening the book.
Calculation practice is especially important. If the code section feels comfortable but transformer, service, motor, or feeder math still causes panic, keep working the math. The dedicated calculation section is not decorative.
Also practice switching between code interpretation and calculations. That mental shift is part of the exam experience and should not be a surprise on test day.
Oregon Master Electrician Exam Day Checklist
Do this
- Bring your current Letter of Authorization
- Bring required identification
- Bring only approved examination references
- Verify your NEC and Oregon amendment materials
- Use a permitted silent, nonprinting, nonprogrammable calculator
- Budget time for the calculation section
- Use a skip-and-return strategy for slow questions
Do not do this
- Bring practice tests into the exam
- Bring class-prep materials or class notes
- Add calculation examples to references
- Add extra pages to approved books
- Bring unauthorized electronics
- Spend most of your time on one section
- Assume a reference is permitted simply because you used it while studying
Oregon testing timeline: take the examination within 60 days of the date on your Letter of Authorization. Candidates who fail must wait 30 days before retesting. Oregon advises allowing up to two weeks to receive results.
Oregon Master Electrician Contractor Exam Prep Options
Oregon 2026 Master Electrician Study Guide
General Supervising Exam Preparation
- Oregon master-level electrical focus
- 12 practice exams
- 2 full final exams
- Code-navigation practice
- Calculation-focused preparation
- Oregon supervising-license information
Master Study Guide + 2026 NEC
Code Navigation Package
- 2026 Oregon Master Electrician Study Guide
- 2026 National Electrical Code
- NEC tabs
- Oregon master-level preparation
- Services, feeders, grounding, motors, and transformers
- Open-book code-navigation practice
Master + Calculations + NEC Combo
Advanced Electrical Math
- Oregon Master Electrician Study Guide
- Electrician Calculations Study Guide
- 2026 National Electrical Code
- Service and feeder calculations
- Motor and transformer calculations
- Conductor and overcurrent calculations
Exam-room reminder: 1 Exam Prep products are study resources. Only take a resource into the Oregon exam if it is permitted under the current BCD examination-material rules and your Letter of Authorization.
Oregon Master Electrician Exam Prep for the General Supervising Electrician License
This Oregon-specific 1 Exam Prep credential artwork is designed for Oregon master-level electrical study and General Supervising Electrician exam preparation.
• Oregon's master-level individual credential is the General Supervising Electrician
• The S exam contains 64 questions
• The exam is divided into code and calculation sections
• Candidates receive four hours
• Oregon requires a 75% passing score
• The examination is open book
• The current 2026 OESC is based on the 2026 NEC
• S candidates need an additional 8,000 hours of journeyman experience
• The General Supervising Electrician is the key signing-supervisor credential for unrestricted Oregon electrical contracting
Practice code navigation and calculations together, because Oregon's master-level exam expects both skills in the same four-hour testing window.
Frequently Asked Questions
Oregon Master Electrician Licensing
Oregon does not use a simple statewide Master Electrician title. The master-level individual electrical credential is the General Supervising Electrician, identified by the license code S.
The licensee may design, plan, and lay out electrical work, sign permits, and is the individual authorized to direct, supervise, or control the installation or alteration of an electrical service.
Yes. It is the Oregon credential most closely associated with master-level electrical responsibility and responsible charge.
Exam Format
Oregon currently lists 64 questions on the General Supervising Electrician examination.
Current Oregon Business Xpress information identifies a two-section exam containing 52 code questions and 12 calculation questions.
Candidates currently receive four hours.
Oregon requires a score of 75 percent or better on licensing examinations.
Yes. The current Oregon licensing directory identifies the examination as open book.
Experience Requirements
One current route is to be licensed as an Oregon Journeyman Electrician and then verify an additional 8,000 hours of on-the-job journeyman experience.
Oregon also allows an applicant who meets the qualifications to be licensed as an Oregon Journeyman Electrician to verify an additional 8,000 hours of journeyman experience. The 300 percent rule applies to that qualification route.
The current General Supervising Electrician requirement is an additional 8,000 hours of on-the-job journeyman electrical experience.
Current Code and References
The 2026 Oregon Electrical Specialty Code became effective October 1, 2026.
The 2026 Oregon Electrical Specialty Code is based on the 2026 NFPA 70 National Electrical Code.
Current Oregon guidelines list the NEC with Oregon amendments, NEC Handbook, ORS Chapter 479, OAR Division 918, American Electrician's Handbook, Electrical Black Book, Ugly's Electrical References, Ferm's Fast Finder Index, Tom Henry's Key Word Index, and a silent nonprinting nonprogrammable calculator. Always follow your current Letter of Authorization.
Current Oregon guidelines allow commercial or self-generated tabs and highlighting in approved materials.
Limited handwritten side-margin notes are permitted when they identify a code reference to another section or a state or local amendment. Other personal notes that do not meet the guideline are prohibited.
No. Oregon's current electrical exam guidelines prohibit practice tests, class-prep materials, class notes, added calculation examples, and extra attached pages.
Calculation Section
Current Oregon Business Xpress information identifies 12 calculation questions.
Prepare for services, feeders, conductors, ampacity, voltage drop, overcurrent protection, motors, transformers, grounding, raceway fill, box fill, and other NEC-based electrical calculations.
Yes. Timed practice helps you improve problem setup, formula selection, NEC table use, arithmetic accuracy, and pacing across the four-hour examination.
Exam Process
After BCD approves your electrical license application, the division sends a Letter of Authorization with scheduling instructions and the approved testing-material list.
Oregon currently requires the examination to be taken within 60 days of the date on the Letter of Authorization.
Current BCD guidance requires applicants to wait 30 days after each failed examination before retesting.
Oregon asks applicants to allow up to two weeks to receive examination results.
Electrical Contractor Business
No. The S license is an individual electrical credential. Electrical Contractor (C) is a company license allowing a business to engage in making electrical installations.
Yes. Oregon's contractor licensing structure uses the General Supervising Electrician as the qualified signing-supervisor credential for the unrestricted Electrical Contractor company license.
Yes. Oregon requires contractors performing electrical work to have the appropriate BCD contractor license and an active Construction Contractors Board license.
The BCD Electrical Contractor company license is a business credential. The key electrical qualification is the appropriate signing supervisor rather than another General Supervising trade examination for the company.
Reciprocity and Renewal
Oregon currently lists reciprocity agreements for the General Supervising Electrician license with Arkansas and Utah.
The General Supervising Electrician license renews every three years on October 1. Oregon currently lists October 1, 2028 as the next renewal date for S licenses.
Oregon currently requires 24 hours total: 4 hours of Oregon rule and law, 12 hours of code change, and 8 hours of code-related education.
1 Exam Prep
Yes. 1 Exam Prep offers Oregon 2026 Master Electrician study guides, practice exams, flash-card combinations, calculation guides, NEC packages, and larger exam-prep combinations for master-level and supervising-electrician study.
Yes. Current Oregon 2026 Master Electrician products are available based on the 2026 NEC, matching the base code for the current 2026 Oregon Electrical Specialty Code.
Yes. The Oregon Master Electrician + Electrician Calculations + NEC combinations add focused electrical-math preparation to the master-level code study.
Watch: Oregon Electrician 2026 Licensing Guide
Watch this related 1 Exam Prep Oregon electrician video for guidance on the Oregon electrical licensing ladder, journeyman requirements, supervising electrician progression, experience documentation, current code preparation, and contractor-related licensing.
Oregon master-level exam-prep tip: use the video to understand the licensing path, then prepare specifically for the General Supervising Electrician exam with timed code lookup, Oregon law review, and repeated calculation practice.
Oregon Master Electrician Contractor Exam Prep Resources
Combine current Oregon Building Codes Division requirements with 1 Exam Prep master-level electrical study materials. Recheck BCD instructions before testing because examination references and licensing procedures can change.
Oregon 2026 Master Electrician Study Guide
Oregon Master Study Guide + Flash Cards
Oregon Master Study Guide + 2026 NEC
Oregon Master + Calculations + NEC
Oregon Master Ultimate Combo
Oregon Electrical License Application
Oregon Individual License Requirements
Oregon BCD Exam Information
2026 Oregon Electrical Specialty Code
Oregon Electrical Continuing Education
Oregon Electrical Reciprocity
Oregon Electrical Contractor Licensing
Oregon Contractor / Business Application
Contact 1 Exam Prep
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