Missouri Local Electrical Licensing • Springfield ICC W17 • 80 Questions • 240 Minutes • Open Book • 2017 NEC
Ready to prepare for your Missouri Journeyman Electrician examination? This complete guide explains local electrical licensing, the Springfield ICC W17 trade examination, National Electrical Code references, wiring methods, conductor calculations, grounding and bonding, services, branch circuits, motors, special occupancies, and related electrical study materials from Contractor Exam Preps.
Journeyman electricians play an important role in keeping homes, businesses, schools, hospitals, factories, and other buildings safely powered.
They install, repair, maintain, and troubleshoot electrical circuits, conductors, equipment, and related systems.
They also follow electrical codes, safety practices, approved plans, and local permit requirements.
Electricity is useful, but it does not have much patience for mistakes!
That is one reason electrical licensing examinations are an important part of professional development.
A Journeyman Electrician examination helps evaluate whether a candidate understands the code requirements and trade principles used in electrical installations.
Missouri licensing has an important detail that every applicant should understand before studying.
Missouri does not issue one universal statewide Journeyman Electrician credential through a single statewide examination.
Local cities and counties can maintain their own electrical licensing and certification programs.
This means examination requirements may differ depending on where the applicant wants to work.
Springfield is one example.
The City uses a local electrical qualification process with a published International Code Council examination.
Other jurisdictions, including the City of St. Louis and St. Louis County, maintain their own electrical licensing frameworks.
Missouri also offers a separate statewide Electrical Contractor license through the Office of Statewide Electrical Contractors.
The statewide contractor credential is not the same as an individual Journeyman Electrician certificate.
The two credentials have different purposes and application requirements.
For Missouri Journeyman Electrician exam preparation, this guide focuses on the verified Springfield W17_MO_S examination while explaining other ICC testing paths.
The Springfield W17 exam is administered through the ICC Contractor and Trades program, with examination appointments provided through Pearson VUE.
Its official published title is W17 Missouri (Springfield) Journeyman Electrician.
The examination contains 80 multiple-choice questions.
The time limit is four hours, or 240 minutes.
The examination is open book.
Its approved primary code reference is the 2017 National Electrical Code, also known as NFPA 70.
The published bulletin additionally lists Ugly's Electrical References, any edition.
The listed examination fee is $115 through Pearson VUE, subject to change.
Candidates should review the current ICC bulletin for test-center rules and fees before scheduling.
With 80 questions and 240 minutes available, candidates have an average of three minutes per question.
That time needs to cover reading the question, recognizing the subject, locating the correct code requirement, working any calculation, and selecting an answer.
For open-book electrical testing, learning to navigate the NEC efficiently is an important skill.
An open-book examination does not mean every answer will be easy to locate.
The NEC contains definitions, rules, tables, exceptions, notes, and requirements spread across many chapters.
A candidate who knows the book's structure can often locate important provisions much faster.
Someone who has never practiced with the codebook may spend several minutes searching for the first question.
That is not a great way to begin a four-hour exam!
The Springfield W17 bulletin lists nine official content categories.
The largest is Wiring Methods and Materials, representing 26% of the examination.
This category includes raceways, conduit, cables, boxes, cabinets, and related electrical installation requirements.
Electricians need to understand when a wiring method is permitted and how conductors must be installed and protected.
They should also understand conduit fill, box fill, equipment support, environmental limitations, and materials.
The second-largest category is Branch Circuits and Conductors, representing 19%.
This category includes branch circuit requirements, conductor ampacity, overcurrent protection, and related installation rules.
Candidates should practice calculations involving conductor size, continuous loads, and circuit protection.
They should understand when GFCI or AFCI protection is required under the examination's NEC edition.
Remember that the correct answer must come from the listed code edition, not a newer NEC rule that may be different.
Equipment and Devices represents 13% of the examination.
Study receptacles, switches, luminaires, appliances, equipment connections, and related electrical devices.
Review equipment installation requirements and how manufacturer instructions relate to code compliance.
Services and Service Equipment represents 11%.
Service conductors, disconnecting means, grounding, bonding, service equipment, and equipment ratings are important concepts.
Electricians should understand the difference between the electrical service, feeders, and branch circuits.
Special Occupancies, Equipment and Conditions also represents 11%.
These topics can include hazardous locations, healthcare spaces, swimming pools, emergency systems, and specialized equipment within the NEC.
Special installations may have different requirements from ordinary residential or commercial circuits.
General Knowledge represents 6%.
Study electrical theory, trade terminology, code definitions, basic calculations, and general safety concepts.
Motors and Generators also represents 6%.
Review motors, controllers, motor circuits, overload protection, conductor sizing, and generator installations.
Motors require special attention because the NEC has detailed rules for their protection and conductors.
Feeders represents 4%.
Study feeder conductors, feeder calculations, feeder disconnects, and the rules that connect electrical services to distribution equipment.
Control Devices represents the remaining 4%.
Review switches, controllers, disconnects, remote controls, and related electrical equipment.
These nine subjects total 100% of the Springfield W17 examination blueprint.
The two largest categories, Wiring Methods and Materials and Branch Circuits and Conductors, account for 45% of the published exam.
That is almost half of the test.
These areas deserve extra study time, but candidates should not ignore the remaining subjects.
In addition to the Springfield W17 exam, ICC publishes national standard Journeyman Electrician examinations.
The commonly referenced exam codes include G17, T17, and R17.
The important difference among these examinations is the National Electrical Code edition.
The Springfield W17 examination uses the 2017 NEC.
ICC National T17 uses the 2020 NEC.
ICC National R17 uses the 2023 NEC.
These national examinations also use a published 80-question, four-hour open-book format.
They are not automatically interchangeable with Springfield W17 for local licensing purposes.
A candidate should confirm which examination their licensing authority accepts.
For example, passing a newer NEC-based national exam does not automatically mean that Springfield will waive its local requirements.
Local governments may impose their own experience, examination, documentation, and certification rules.
The same principle applies in other Missouri cities and counties.
Missouri's Office of Statewide Electrical Contractors administers a separate statewide contractor license.
That program is designed for electrical contracting businesses and qualified individuals seeking statewide contractor authorization.
The state accepts certain approved examinations from recognized testing organizations.
Its published approved-examinations list includes qualifying examinations at the Electrical Contractor, Master Electrician, and Journeyman Electrician levels.
However, accepting an examination is not the same as waiving the state's experience, insurance, and application requirements.
Missouri law lists several experience or education pathways for statewide electrical contractor applicants.
One pathway includes 12,000 verifiable practical hours installing electrical equipment and associated wiring.
Another allows 10,000 practical hours combined with a qualifying electrical journeyman certificate from a U.S. Department of Labor-approved apprenticeship program.
The law also lists qualifying associate-degree and electrical-engineering-degree pathways with different experience requirements.
Applicants must also satisfy the applicable examination, liability insurance, and other licensing conditions.
These are statewide contractor requirements, not automatically the minimum experience standards for every local Journeyman Electrician credential.
The distinction is important for career planning.
A person preparing for a local journeyman examination should follow the requirements of the local licensing agency.
Someone applying for statewide Electrical Contractor authorization should follow the Office of Statewide Electrical Contractors.
The National Electrical Code is the foundation of many electrician examinations.
The NEC is organized into chapters, articles, sections, tables, and related reference material.
Learning the codebook is similar to learning how a large toolbox is organized.
If every tool is in the wrong drawer, even a simple job can take all afternoon.
Start with definitions and general electrical requirements.
Review the major NEC article groups.
Branch circuit questions often lead to Article 210 and related provisions.
Load calculations often involve Article 220 in the 2017 NEC.
Electrical services are generally covered by Article 230.
Overcurrent protection is addressed in Article 240.
Grounding and bonding are addressed in Article 250.
Wiring methods are covered across Chapter 3.
Conductor ampacity, raceway fill, box fill, and equipment requirements also appear in important NEC tables and articles.
Motors are covered in Article 430.
Generator provisions appear in Article 445.
Different chapters cover special occupancies and equipment.
Candidates should practice locating the actual answer rather than relying only on memorized article numbers.
Always read the rule's conditions and exceptions.
A small detail can change the correct answer.
Journeyman Electrician candidates should practice electrical math even if they work with calculations every day.
Review Ohm's law, electrical power, resistance, and current.
Practice voltage-drop calculations.
Study conductor sizing and adjustment factors.
Review branch-circuit and service load calculations.
Practice the electrical requirements for motors and their protection.
Understand the difference between a conductor's ampacity and the rating of its overcurrent protective device.
Review conduit-fill and box-fill calculations.
Be comfortable using the tables and formulas permitted by the exam rules.
The Springfield W17 exam permits Ugly's Electrical References in addition to the 2017 NEC.
That compact reference can support calculations and general electrical values during practice.
It should be used according to the current examination rules.
Contractor Exam Preps offers Missouri-specific Journeyman Electrician packages that support exam preparation, codebook practice, and electrical calculations.
The store offers a 2023 Missouri Journeyman Electrician Study Guide and National Electrical Code Combo with Tabs.
This package combines a Missouri Journeyman Electrician study guide with the 2023 NEC paperback and code tabs.
It supports practice questions and repeated NEC navigation.
However, Springfield W17 currently lists the 2017 NEC.
The included 2023 NEC should therefore be treated as supplemental education for Springfield candidates rather than a replacement for the official W17 codebook.
Another option is the 2023 Missouri Journeyman Electrician and Electrician Calculations Study Guides with NEC Combo.
This package combines trade preparation with electrical calculations.
It is useful for reviewing conductor sizing, load computations, motor questions, voltage drop, and related math topics.
The store also offers a 2023 Missouri Journeyman Electrician Super Combo.
This option includes a Journeyman study guide, electrical calculations preparation, NEC materials, tabs, and flash cards.
For more extensive preparation, the 2023 Missouri Journeyman Electrician Ultimate Combo includes a broader study collection.
Product availability, prices, access terms, and package contents should be checked on the current listings.
The site also offers a general 2026 Journeyman Electrician Study Guide and NEC Combo.
This is a current-code educational resource, not the official Springfield W17 reference set.
For more exam-focused training using the correct Springfield references, 1ExamPrep offers a Missouri Journeyman Electrician Exam Prep Guide and Springfield W17-specific study options.
Confirm the local jurisdiction where you need to qualify.
Check the exact exam code and the current reference list.
Confirm whether your licensing office requires experience records or an application before scheduling.
Gather the correct NEC edition and permitted supporting references.
Practice the largest subject areas first.
Then review the entire blueprint.
Complete timed examinations using the four-hour W17 limit when preparing for Springfield.
Use mistakes as study opportunities.
Find the correct code language for each missed question.
Review calculations until the steps become familiar.
Remember that the purpose of electrical exam preparation is not just to pass a test.
It is to build stronger habits for safe installations, reliable equipment, correct calculations, and code-compliant work.
The sections below provide the full licensing overview, Springfield blueprint, codebook comparison, electrical systems diagram, study strategies, six-week plan, related Contractor Exam Preps products, interactive FAQs, 1ExamPrep video, and a detailed conclusion.
Important Missouri Journeyman Electrician 2026 Update: Missouri Journeyman Electrician licensing is commonly handled by local cities and counties rather than through one statewide journeyman exam. The published Springfield ICC W17_MO_S examination contains 80 multiple-choice questions, allows 240 minutes, and is open book. Its listed references are the 2017 National Electrical Code and Ugly's Electrical References, any edition. Wiring Methods and Materials is the largest content area at 26%, followed by Branch Circuits and Conductors at 19%. ICC national T17 and R17 are separate examinations using the 2020 and 2023 NEC respectively. Missouri's statewide Electrical Contractor license is also a separate credential. Contractor Exam Preps sells Missouri Journeyman Electrician packages based on the 2023 NEC, so Springfield candidates must obtain the correct 2017 codebook separately for W17 testing. Confirm the current exam bulletin and local passing-score requirements before your appointment.
A Missouri Journeyman Electrician is an electrical tradesperson who meets the qualification requirements established by the applicable licensing jurisdiction.
These requirements may include documented experience, apprenticeship training, an approved examination, and a local application.
Journeyman electricians work on electrical conductors, branch circuits, feeders, services, equipment, lighting systems, motors, and related installations.
They must understand how to perform work safely and according to applicable electrical codes.
They also need to read wiring diagrams, use electrical testing equipment, and troubleshoot electrical problems.
Different jurisdictions may use different journeyman licensing and certification structures.
Springfield provides a local trade certification pathway.
The City of St. Louis has a Committee of Electrical Examiners.
St. Louis County also maintains a separate electrical licensing framework.
Missouri's statewide electrical contractor program is different.
It allows qualified applicants to apply for contractor authorization through the Office of Statewide Electrical Contractors.
A local journeyman credential does not automatically authorize the holder to operate an electrical contracting business.
Contractor licensing can involve separate experience, insurance, application, and responsible-person requirements.
Trade: Journeyman Electrician.
Typical credential: Local individual electrical qualification.
Springfield example: ICC W17_MO_S.
State contractor authority: Missouri Office of Statewide Electrical Contractors.
Primary exam study source: The correct NEC edition and local bulletin.
| Step | Requirement | What to Prepare |
|---|---|---|
| State | Missouri | Identify the location where you intend to work. |
| Journeyman Licensing | Local | Check the applicable city or county rules. |
| Statewide Contractor Path | Separate Credential | Review the Office of Statewide Electrical Contractors. |
| Springfield Authority | City of Springfield | Review trade certification requirements. |
| Springfield Examination | ICC W17_MO_S | Use the correct W17 blueprint. |
| Exam Administrator | ICC / Pearson VUE | Review the testing bulletin. |
| W17 Questions | 80 | Complete multiple-choice practice exams. |
| W17 Time | 240 Minutes | Practice four-hour timed sessions. |
| W17 Format | Open Book | Practice approved codebook navigation. |
| W17 Primary Reference | 2017 NEC | Study the correct code edition. |
| W17 Additional Reference | Ugly's Electrical References | Any edition is listed in the bulletin. |
| W17 Largest Topic | Wiring Methods and Materials | Study raceways, cables, boxes, and wiring methods. |
| W17 Second Topic | Branch Circuits and Conductors | Review conductor sizing and protection. |
| Exam Fee | $115 Listed | Confirm current Pearson VUE pricing. |
| Local Passing Score | Confirm City Rules | Review Springfield's accepted examination score requirements. |
| Experience | Local Rules Apply | Document electrical work and training. |
| Apprenticeship | May Be Relevant | Provide qualifying training records when applicable. |
| Local Application | Required as Applicable | Submit the proper certification application. |
| Alternative National Exam | ICC T17 | Uses 2020 NEC when accepted by the authority. |
| Alternative National Exam | ICC R17 | Uses 2023 NEC when accepted by the authority. |
| Additional Jurisdictions | Separate Rules | Check St. Louis City, St. Louis County, and other locations. |
| NEC Reference Tabs | ICC Policy Applies | Use only permitted markings and tabs. |
| License Issuance | Local Authority | Complete all post-examination requirements. |
| Contractor Business | Separate Application | Meet contractor-level qualifications. |
| Contractor Insurance | State and Local Rules | Review applicable liability insurance requirements. |
| State Contractor Exam | Approved Assessment | Confirm that a previously passed exam qualifies. |
| Permits | Jurisdiction Specific | Follow the applicable permit and inspection process. |
| Renewal | Credential Specific | Confirm local renewal requirements. |
Use this table to understand the Springfield W17 examination and the differences between local journeyman testing and broader contractor licensing.
| Detail | Category | Published Information |
|---|---|---|
| Trade | Electrical | Journeyman Electrician |
| Jurisdiction | Local | Springfield, Missouri |
| Exam Name | ICC | W17 Missouri Springfield Journeyman Electrician |
| Exam Code | ICC | W17_MO_S |
| Exam Provider | Testing | ICC / Pearson VUE |
| Questions | Testing | 80 |
| Time | Testing | 240 Minutes |
| Format | Testing | Open Book |
| Question Type | Testing | Multiple Choice |
| Average Time Per Question | Planning | Three Minutes |
| Exam Fee | Testing | $115 Listed, Subject to Change |
| Passing Requirement | Licensing | Confirm Current Local Certification Standard |
| Primary Code | Reference | 2017 National Electrical Code |
| Supporting Book | Reference | Ugly's Electrical References, Any Edition |
| General Knowledge | Blueprint | 6% |
| Services and Service Equipment | Blueprint | 11% |
| Feeders | Blueprint | 4% |
| Branch Circuits and Conductors | Blueprint | 19% |
| Wiring Methods and Materials | Blueprint | 26% |
| Equipment and Devices | Blueprint | 13% |
| Control Devices | Blueprint | 4% |
| Motors and Generators | Blueprint | 6% |
| Special Occupancies and Conditions | Blueprint | 11% |
| Number of Official Categories | Blueprint | Nine |
| National ICC T17 | Alternative Exam | 80 Questions, Four Hours, 2020 NEC |
| National ICC R17 | Alternative Exam | 80 Questions, Four Hours, 2023 NEC |
| Statewide Contractor License | Separate Credential | Missouri Office of Statewide Electrical Contractors |
| Other Cities | Local Licensing | Separate Application and Exam Requirements May Apply |
Springfield W17: 80 questions, four hours, open book.
Official reference: 2017 NEC and Ugly's Electrical References.
Largest topic: Wiring Methods and Materials, 26%.
Important: Verify the local passing score with Springfield before testing.
Study conduit, raceways, cables, fittings, boxes, cabinets, conduits installed in different environments, and conductor installation methods.
Review permitted uses, fill requirements, support methods, and equipment enclosures.
This is the largest published subject on the Springfield W17 examination.
Study branch circuit requirements, conductor ampacity, overcurrent protection, receptacle circuits, lighting circuits, GFCI, AFCI, and installation requirements.
Practice conductor sizing and load calculations.
Review receptacles, switches, panelboards, appliances, luminaires, disconnects, wiring devices, and electrical equipment installation.
Understand how equipment ratings and installation conditions affect code compliance.
Study electrical services, service conductors, disconnecting means, grounding, bonding, service equipment, and related protection.
Review basic service-load calculations.
Review NEC requirements for special locations, unusual electrical equipment, hazardous environments, and specialized installations.
Study the applicable special-occupancy rules found in the 2017 NEC.
Practice electrical theory, Ohm's law, electrical power, terminology, code definitions, and basic trade knowledge.
Study motor conductor sizing, controllers, overload protection, overcurrent protection, generators, and related electrical requirements.
Review feeder conductors, feeder load calculations, conductor protection, equipment connections, and feeder installation rules.
Study controllers, switches, motor controls, disconnects, and related electrical control equipment.
Official total: Nine categories, totaling 100%.
Most heavily weighted category: Wiring Methods and Materials, 26%.
Second: Branch Circuits and Conductors, 19%.
Combined: 45% of the examination.
Source to verify: Current ICC Springfield Contractor and Trades Bulletin.
Begin by confirming your Missouri licensing jurisdiction.
Next, verify the exact examination code.
If you are preparing for Springfield W17, download the current ICC Contractor and Trades examination bulletin.
Review the approved references.
Get the 2017 National Electrical Code and Ugly's Electrical References.
Learn the codebook's organization.
Practice locating definitions, articles, tables, and installation requirements.
Start with Wiring Methods and Materials, the largest W17 category.
Review raceways, cables, boxes, conduits, cabinets, and permitted installation methods.
Then study Branch Circuits and Conductors.
Practice ampacity, overcurrent protection, required branch circuits, and load calculations.
Review equipment and devices.
Practice services, grounding, and bonding.
Study special occupancies and electrical equipment.
Finish with motors, generators, feeders, control devices, and general electrical knowledge.
Make electrical calculations part of every week.
Use timed practice to improve your NEC navigation speed.
The Missouri Journeyman NEC Combo offers study questions and code-navigation practice based on the 2023 NEC.
For additional calculations, consider the Missouri Journeyman and Calculations Combo.
These packages are supplemental for Springfield W17 because its listed testing codebook is the 2017 NEC.
Complete full 80-question practice examinations within four hours.
Review missed questions using the actual code provision.
First priority: Wiring Methods and Materials.
Second priority: Branch Circuits and Conductors.
Third priority: Equipment, Services and Special Conditions.
Approved Springfield NEC: 2017.
Final practice goal: 80 questions within 240 minutes.
Electrical installations connect service equipment, distribution panels, feeders, branch circuits, and electrical loads.
The simplified diagram below shows several electrical systems relevant to the Journeyman Electrician examination.
Simplified educational diagram only. Actual system designs require code-compliant grounding, bonding, overcurrent protection, conductor sizing, approved equipment and proper installation.
Determine which city or county will issue or recognize your Journeyman Electrician qualification.
Verify whether you need Springfield W17, ICC national T17 or R17, or another approved examination.
Gather apprenticeship documents, employment records, references, and qualifying electrical work history as required.
For Springfield W17, use the 2017 NEC and Ugly's Electrical References, not a different NEC edition.
Review wiring methods, branch circuits, services, equipment, motors, feeders, special occupancies, and control devices.
Complete 80-question practice examinations within four hours and develop reliable NEC navigation.
Submit accepted examination results and any remaining documents to the local licensing authority.
Review separate master-level or Missouri statewide Electrical Contractor licensing requirements if your career goals involve operating a business.
The percentages below come from the published ICC Springfield W17 examination outline.
They represent the Springfield examination, not a universal Missouri statewide journeyman exam.
Official total: 100% across nine topics.
Top subject: Wiring Methods and Materials, 26%.
Second subject: Branch Circuits and Conductors, 19%.
Combined top two: 45%.
Exam format: 80 questions, four hours, open book.
The correct book edition is one of the most important details in Missouri electrical exam preparation.
Springfield W17, ICC T17, and ICC R17 use different NEC editions.
| Reference | Edition | Exam or Study Use |
|---|---|---|
| National Electrical Code, NFPA 70 | 2017 | Official Springfield W17 exam reference. |
| Ugly's Electrical References | Any Edition | Official Springfield W17 supporting reference. |
| National Electrical Code, NFPA 70 | 2020 | Published ICC National T17 examination reference. |
| National Electrical Code, NFPA 70 | 2023 | Published ICC National R17 examination reference. |
| 2023 Missouri Journeyman Study Guide and NEC Combo | 2023 NEC | Missouri-branded Contractor Exam Preps study package; supplemental for Springfield W17. |
| 2023 Missouri Journeyman Calculations Combo | 2023 NEC | Additional electrical calculations and NEC navigation practice. |
| 2023 Missouri Journeyman Super Combo | 2023 NEC | Study guides, flash cards, codebook and tabs for 2023-code learning. |
| 2023 Missouri Journeyman Ultimate Combo | 2023 NEC | Broad Missouri electrical examination preparation package. |
| General Journeyman Electrician NEC Combo | 2026 NEC | Newer code education; not a substitute for Springfield's official 2017 reference. |
| 2017 Tom Henry NEC Key Word Index | 2017 | Supplemental study aid for NEC navigation. Verify any exam-room permission separately. |
Springfield W17: 2017 NEC plus Ugly's Electrical References.
ICC National T17: 2020 NEC.
ICC National R17: 2023 NEC.
Contractor Exam Preps Missouri packages: Verified 2023 NEC-based study options.
Important: Newer code editions may differ from the edition used for your actual exam.
An open-book electrical examination requires good technical knowledge and fast reference navigation.
Start by learning the organization of the National Electrical Code.
Practice identifying a question's subject before opening the book.
If the question involves a feeder, find the appropriate feeder rules.
If the question concerns conductor ampacity, identify the applicable table and installation conditions.
If the question involves grounding and bonding, review the correct Article 250 provision.
Read exceptions and notes carefully.
Use Ugly's Electrical References for calculation practice and permitted reference support.
Practice answering 80 questions within four hours.
A Missouri Journeyman Electrician may perform electrical work within the scope authorized by the applicable local licensing rules.
Common duties include installing and repairing electrical conductors, branch circuits, raceways, boxes, receptacles, switches, lighting systems, and equipment.
Journeymen also work with electrical panels, feeders, motors, disconnecting means, and related power distribution systems.
They should understand grounding, bonding, overcurrent protection, and electrical safety.
Some work may require supervision by a master electrician or an authorized electrical contractor.
Other work may require permits, inspections, and documented testing.
The permitted work scope depends on the exact credential and the local authority.
A journeyman qualification does not necessarily allow the electrician to advertise or operate as an independently licensed electrical contractor.
For statewide contracting, Missouri uses a separate licensing program with its own examination, experience, insurance, and application conditions.
Typical work: Electrical installation, maintenance, repair, and troubleshooting.
Technical systems: Services, feeders, branch circuits, wiring methods, devices, and equipment.
Job requirements: Applicable codes, permits, inspections, and supervision.
Business license: May be separate from an individual's Journeyman Electrician credential.
| Credential or Examination | Authority | Main Difference |
|---|---|---|
| Springfield Journeyman Electrician | City of Springfield | Local individual trade qualification using ICC W17_MO_S. |
| Springfield Master Electrician | City of Springfield | Separate master-level qualification with a different examination, ICC W16. |
| ICC National T17 | ICC | National standard journeyman examination based on the 2020 NEC. |
| ICC National R17 | ICC | National standard journeyman examination based on the 2023 NEC. |
| St. Louis Journeyman Electrical Qualifications | City of St. Louis | Separate local examination and certification process. |
| St. Louis County Electrical Licensing | St. Louis County | Separate county electrical licensing framework. |
| Missouri Statewide Electrical Contractor | Office of Statewide Electrical Contractors | Separate contractor-level license with statewide statutory requirements. |
| Electrical Contractor Business | Applicable State or Local Authority | Business authorization may require a qualifying license holder, insurance, and permits. |
Journeyman: Individual trade qualification.
Master: More advanced qualification with separate requirements.
Electrical Contractor: Authorization to provide contracting services under applicable business licensing rules.
Exam acceptance: Verify with the specific Missouri authority.
ICC W17_MO_S
Different NEC Edition Paths
Separate Contractor Licensing Program
This study plan focuses on Springfield W17. Candidates preparing for T17, R17, or another local examination should adjust their codebook and topic review to the correct bulletin.
Missouri Journeyman Electrician examinations can be challenging because they test how well candidates understand and apply electrical requirements.
Field experience is valuable, but electrical test questions may focus on details that electricians do not use every day.
For example, a candidate may be very experienced with residential wiring but less familiar with special occupancies, generators, or certain motor calculations.
Another candidate may understand large commercial installations but need more practice with branch circuit protection and NEC definitions.
The Springfield W17 exam covers nine official subjects.
Wiring Methods and Materials represents 26% of the examination.
Branch Circuits and Conductors represents another 19%.
These two areas account for 45% of the test.
However, equipment, services, special occupancies, motors, control devices, feeders, and general knowledge can also affect the final score.
Open-book testing does not eliminate the need to prepare.
A candidate still needs to identify the right code section quickly.
Contractor Exam Preps offers several Missouri Journeyman Electrician study packages to support electrical study and practice.
These packages are based on the 2023 NEC, so Springfield candidates also need to practice with the official 2017 NEC.
The most useful preparation combines codebook navigation, repeated technical practice, calculations, and timed testing.
Contractor Exam Preps offers Missouri-branded electrical study sets covering NEC navigation, trade knowledge, electrical calculations, flash cards, and exam practice.
The verified Missouri packages shown below are based on the 2023 National Electrical Code.
For Springfield W17, obtain the official 2017 NEC reference separately and treat the 2023 materials as supplemental training.
Missouri Study Guide, NEC and Tabs
Important: The 2023 NEC is not Springfield W17's listed 2017 NEC exam-room reference.
Trade Knowledge and Electrical Mathematics
Important: Use the correct 2017 NEC to prepare specifically for Springfield W17.
Expanded Electrical Exam Preparation
Important: The package's 2023-code foundation is supplemental to the Springfield W17 2017 NEC examination.
Focused Missouri code package: Study Guide and NEC Combo.
Calculation-heavy preparation: Journeyman and Calculations Combo.
Expanded study: Missouri Journeyman Ultimate Combo.
Additional flash-card option: Missouri Journeyman Super Combo.
Exam edition warning: Springfield W17 uses the 2017 NEC, while these Missouri packages use the 2023 NEC.
For an additional flash-card study option, explore the 2023 Missouri Journeyman Electrician Super Combo.
For newer code education, the store also offers a 2026 Journeyman Electrician Study Guide and NEC Combo.
For more specifically targeted Springfield W17 preparation using the 2017 NEC and Ugly's, see the 1ExamPrep Missouri Journeyman Electrician Guide.
Actual Missouri Journeyman Electrician product image hosted on ContractorExamPreps.com. The retailer product contains 2023 NEC study materials; Springfield W17 lists the 2017 NEC for its exam. The Missouri credential illustration is educational, not an official license.
This Missouri-themed educational credential includes the state outline, a lightning symbol, electrical breaker equipment, and the official Springfield W17 exam format.
The real accompanying store image comes from Contractor Exam Preps' Missouri Journeyman Electrician NEC Combo product page.
• Missouri Journeyman Electrician
• Missouri Local Electrical Licensing
• Springfield ICC W17_MO_S
• Journeyman Electrician Examination
• ICC Contractor and Trades
• Pearson VUE Testing
• 80 Multiple-Choice Questions
• 240-Minute Time Limit
• Open-Book Testing
• 2017 National Electrical Code
• Ugly's Electrical References
• Nine Official Exam Categories
• Wiring Methods and Materials
• Conduit and Raceways
• Electrical Cable Systems
• Conduit Fill
• Box Fill
• Electrical Cabinets
• Wiring Supports
• Branch Circuits
• Conductors
• Conductor Ampacity
• Overcurrent Protection
• GFCI Requirements
• AFCI Requirements
• Electrical Services
• Service Equipment
• Service Disconnects
• Feeders
• Service Load Calculations
• Feeder Calculations
• Electrical Distribution
• Grounding and Bonding
• Grounding Electrode Systems
• Equipment Grounding Conductors
• Bonding Jumpers
• Receptacles
• Switches
• Lighting Equipment
• Panelboards
• Electrical Appliances
• Equipment Ratings
• Control Devices
• Motor Controllers
• Disconnecting Means
• Motors and Generators
• Motor Circuit Calculations
• Motor Overload Protection
• Electrical Theory
• Ohm's Law
• Voltage Drop
• Electrical Power
• Resistance and Current
• NEC Article Navigation
• NEC Chapter 9 Tables
• Special Occupancies
• Hazardous Locations
• Swimming Pool Electrical Rules
• Emergency Systems
• Equipment and Special Conditions
• Electrical Safety
• Trade Experience
• Apprenticeship Training
• Local Exam Eligibility
• Local Journeyman Certification
• Master Electrician Advancement
• Missouri Statewide Electrical Contractor Licensing
• Contractor Experience Pathways
• Contractor Insurance
• Contractor Exam Preps Study Guides
• Missouri Journeyman NEC Combo
• Electrical Calculations Study Guides
• NEC Tabs and Flash Cards
Missouri Journeyman Electrician Licensing
Missouri does not issue one universal statewide Journeyman Electrician credential through a single statewide exam. Individual journeyman licensing is commonly handled by local jurisdictions.
Local licensing authorities may issue journeyman qualifications. Springfield, the City of St. Louis, and St. Louis County are examples of jurisdictions with electrical licensing procedures.
No. A journeyman credential is an individual trade qualification. Contractor licensing authorizes electrical contracting under separate business requirements.
Yes. Missouri has a separate statewide Electrical Contractor program administered by the Office of Statewide Electrical Contractors.
Missouri lists certain approved Journeyman Electrician examinations among accepted assessments. Applicants must still satisfy the remaining statewide contractor requirements.
Springfield ICC W17 Exam Information
Its published ICC code is W17_MO_S.
The published exam contains 80 multiple-choice questions.
It allows four hours, or 240 minutes.
Yes. The official ICC bulletin lists W17 as an open-book examination.
It is an ICC Contractor and Trades examination scheduled through Pearson VUE.
The current published bulletin lists the 2017 National Electrical Code.
Yes. The Springfield W17 bulletin lists Ugly's Electrical References, any edition.
The ICC bulletin lists $115 through Pearson VUE. Verify the current price before paying.
Confirm the current accepted certification passing score with Springfield's trade certification office. Local licensing requirements can differ from general examination policies.
Springfield W17 Examination Topics
Wiring Methods and Materials represents 26% of the examination.
Branch Circuits and Conductors accounts for 19%.
Equipment and Devices accounts for 13% of the official blueprint.
Services and Service Equipment represents 11%.
Yes. Grounding and bonding concepts are important across services, equipment, branch circuits, and other NEC requirements, although they are not shown as a standalone W17 percentage category.
Yes. Motors and Generators accounts for 6% of the examination.
Feeders represents 4%.
Yes. Special Occupancies, Equipment and Conditions represents 11%.
NEC Editions and Other ICC Exams
The published national T17 examination uses the 2020 NEC.
The published national R17 examination uses the 2023 NEC.
Do not assume the examinations are interchangeable. Ask Springfield or the relevant local authority which exam it accepts.
A 2023 NEC can support general electrical education, but the official W17 code reference remains the 2017 NEC. Differences between editions matter on code questions.
A 2026 NEC may be useful for learning newer code requirements but is not the 2017 NEC listed for Springfield W17 testing.
Electrical Calculations and Study Methods
Practice Ohm's law, electrical power, conductor sizing, service loads, feeders, branch circuits, voltage drop, motor calculations, conduit fill, and box fill.
The average is three minutes per question. That includes reading, code lookup, calculations, and answering.
Learn the codebook's organization, practice locating articles and tables, check exceptions, and complete timed exam-style questions.
Follow the current ICC and Pearson VUE examination rules. Not all markings, tabs, or attached materials are permitted.
Contractor Exam Preps Missouri Products
Yes. The store offers several Missouri Journeyman Electrician study packages with NEC materials, calculations preparation, and other study aids.
The Missouri packages featured in this article use the 2023 NEC.
It includes a Missouri Journeyman Electrician Study Guide, the 2023 NEC paperback, and reference tabs.
Yes. The Missouri Journeyman and Electrician Calculations Combo includes additional electrical mathematics study materials.
Yes. The Missouri Journeyman Super Combo includes flash-card study materials along with related electrical references.
It provides broader electrical study materials, but candidates should confirm the NEC edition used by their actual licensing examination.
No. Study resources can help with exam preparation, but candidates must pass the accepted examination and meet all licensing requirements.
Career and Contractor Licensing
Yes, where the local licensing authority offers that progression. Master Electrician qualifications usually involve separate experience and testing requirements.
State law provides multiple paths, including 12,000 practical hours or certain combinations of electrical work hours and qualifying education or apprenticeship training.
Do not assume automatic local acceptance. Check the city or county where you intend to work and the applicable certification or registration rules.
No. Renewal requirements may differ by local jurisdiction and credential. Contact the issuing agency for the current rules.
Watch this related 1ExamPrep Missouri Electrician Licensing Guide. The video explains Missouri electrical licensing, local Journeyman and Master Electrician qualifications, statewide Electrical Contractor licensing, experience requirements, NEC study, and common application mistakes.
This is a Missouri licensing overview, not the official Springfield ICC W17 examination bulletin. Use it alongside the published W17 blueprint and the required 2017 NEC.
Creator: 1ExamPrep.
Video: Missouri Electrician 2026 Licensing Guide.
Related topics: Missouri electrical licensing, local journeyman qualifications, contractor licensing, experience, NEC study, and exam preparation.
Springfield exam reminder: W17, 80 questions, four hours, open book.
Official code reference: 2017 NEC for W17.
Watch Missouri Electrician Licensing Guide on YouTube
Use the applicable licensing authority and official ICC bulletin for examination requirements. Use Contractor Exam Preps for Missouri electrical study materials, calculations, codebook practice, and related products.
State: Missouri.
Credential focus: Journeyman Electrician.
Local exam example: Springfield ICC W17_MO_S.
Exam format: 80 questions, 240 minutes, open book.
Approved Springfield references: 2017 NEC and Ugly's Electrical References.
Store's Missouri products: 2023 NEC study packages.
Statewide Electrical Contractor: Separate license with its own requirements.
Important: Verify the correct local examination before purchasing study materials or scheduling.
Preparing for a Missouri Journeyman Electrician examination is an important step for electrical professionals who want to advance their careers and demonstrate stronger knowledge of electrical codes, installation methods, calculations, and safety.
Journeyman electricians work on many important building systems.
They install conductors, raceways, service equipment, feeders, branch circuits, electrical devices, motors, and lighting.
They also troubleshoot electrical problems and help maintain safe installations.
Because electricity can create serious hazards when equipment is installed incorrectly, electricians must understand the rules that protect people and property.
One of the first things Missouri applicants should understand is how the state's licensing system works.
Missouri does not use one universal statewide Journeyman Electrician examination for every city and county.
Local licensing authorities can maintain their own qualifications and testing requirements.
Springfield provides a clear example.
The published Springfield Journeyman Electrician examination is ICC W17_MO_S.
It contains 80 multiple-choice questions.
Candidates have four hours to complete the test.
The examination is open book.
The listed references are the 2017 National Electrical Code and Ugly's Electrical References, any edition.
Candidates should also verify the current local passing standard and the other certification conditions established by Springfield.
The W17 blueprint covers nine electrical subject categories.
Wiring Methods and Materials is the largest, representing 26% of the examination.
Branch Circuits and Conductors represents 19%.
Together, those two subjects account for 45% of the published examination.
For that reason, candidates should spend substantial study time reviewing wiring methods, conductor ampacity, cable installations, raceway fill, box fill, overcurrent protection, and branch circuit requirements.
Other subjects are important too.
Equipment and Devices accounts for 13%.
Services and Service Equipment accounts for 11%.
Special Occupancies, Equipment and Conditions represents another 11%.
General Knowledge and Motors and Generators each account for 6%.
Feeders and Control Devices each account for 4%.
These categories require candidates to understand electrical principles rather than simply memorize a few answers.
The National Electrical Code plays a central role in this preparation.
Electricians should practice locating important provisions and reading the applicable exceptions and tables.
The correct codebook edition is critical.
Springfield W17 uses the 2017 NEC.
Other ICC national examinations, such as T17 and R17, use different NEC editions.
The national T17 examination is based on the 2020 NEC.
The national R17 examination is based on the 2023 NEC.
Candidates should never assume these examinations are automatically interchangeable for local Missouri licensing.
Before scheduling, confirm which exam the applicable licensing authority accepts.
Contractor Exam Preps offers several Missouri-specific Journeyman Electrician study packages.
The Missouri Journeyman Electrician Study Guide and NEC Combo includes a Missouri-focused study guide, the 2023 National Electrical Code, and tabs.
It supports trade review, repeated practice, and NEC navigation.
The Missouri Journeyman Electrician and Calculations Combo adds focused electrical mathematics preparation.
This is useful for conductor sizing, load calculations, voltage drop, motors, electrical services, raceway fill, and box fill.
For a broader preparation set, the Missouri Journeyman Super Combo includes flash cards with related reference materials.
The Missouri Journeyman Ultimate Combo provides expanded study resources.
These products are based on the 2023 NEC.
Springfield W17 candidates should remember that their examination lists the 2017 NEC instead.
Use the correct official codebook when preparing specifically for W17.
Newer NEC materials can be useful for general electrical education, but changes between editions may affect examination answers.
A practical six-week study plan can help candidates stay organized.
During the first week, identify the correct examination and study the approved references.
Use the second week for wiring methods and materials.
During the third week, concentrate on branch circuits and conductors.
Spend the fourth week reviewing services, feeders, equipment, grounding, and bonding.
Use the fifth week for motors, generators, controls, special occupancies, and remaining technical subjects.
During the final week, complete several timed 80-question practice examinations.
Use the four-hour time limit to build realistic examination habits.
Practice locating NEC requirements quickly.
Review missed questions carefully and confirm the correct code provision.
Because open-book testing is time limited, codebook navigation matters just as much as knowing general electrical principles.
Candidates should also develop stronger electrical calculation skills.
Practice Ohm's law, power, conductor sizing, service and feeder calculations, voltage drop, motor protection, and equipment requirements.
These subjects can appear throughout the examination.
Finally, understand the difference between an individual Journeyman Electrician credential and Missouri's statewide Electrical Contractor license.
The statewide contractor program has separate requirements involving an accepted examination, practical experience or education pathways, insurance, and licensing documentation.
Passing a local journeyman exam does not automatically satisfy every statewide contractor condition.
Applicants planning to operate an electrical contracting business should review the official Office of Statewide Electrical Contractors requirements.
The purpose of Missouri Journeyman Electrician exam preparation is to improve both examination readiness and practical electrical knowledge.
By confirming the correct jurisdiction, studying the official blueprint, using the proper NEC edition, practicing calculations, and working with related Contractor Exam Preps materials, candidates can approach their licensing examination with a clearer plan and stronger preparation.
Find Missouri Journeyman Electrician study guides, NEC books, electrical calculations resources, flash cards, practice questions, and electrician exam preparation at ContractorExamPreps.com.
