Springfield Master Electrician example: the current ICC W16_MO_S exam is 100 questions, 5 hours, open book, and based on the 2017 NEC plus Ugly's Electrical References. ICC states the Master Electrician examination requires 75% correct to pass.
How Does Missouri Master Electrician Licensing Work?
Missouri does not issue one universal statewide Master Electrician license. Local political subdivisions may issue Master Electrician credentials, while the Missouri Office of Statewide Electrical Contractors administers a separate statewide Electrical Contractor license.
For Springfield candidates, the current local Master Electrician exam is ICC W16_MO_S. Missouri's statewide contractor program also accepts approved Master Electrician examinations from multiple testing organizations.
Springfield W16: 100 questions | 5 hours | 75% passing | open book | 2017 NEC + Ugly's.
Statewide contractor answer: Missouri accepts approved examinations at Electrical Contractor, Master Electrician and Journeyman Electrician levels, subject to Office requirements.
Study answer: the 2026 NEC package provides current-code education, but W16 candidates should still use the exact 2017 NEC required by the Springfield exam.
This page keeps local Master Electrician licensing separate from statewide Electrical Contractor licensing so candidates can prepare for the right credential, exam and code cycle.
Missouri Master Electrician Exam and Contractor Paths
Use the exam path that matches your licensing authority.
| Path | What It Means | Published Exam / Rule |
|---|---|---|
| Springfield W16_MO_S Master Electrician | Local Springfield Master Electrician trade certification | 100 questions | 5 hours | 75% | open book | 2017 NEC |
| Missouri Statewide Electrical Contractor | State contractor credential administered by OSEC | Approved contractor, master or journeyman exam may satisfy exam requirement |
| ICC G16 Master Electrician | Missouri-approved ICC master-level examination | 2017 code cycle |
| ICC F16 Master Electrician | Missouri-approved ICC master-level examination | 2014 code cycle |
| Other Missouri Local Master Licenses | City or county credential | Verify local exam, NEC edition and experience rules |
Springfield W16_MO_S Master Electrician Exam Breakdown
Local ExamW16 Missouri (Springfield) Master Electrician
Questions100 multiple-choice questions
Time5 hours | 300 minutes
Passing Score75% Master Electrician standard
Exam FormatOpen book
Testing ProgramICC Contractor/Trades through Pearson VUE
Primary Code2017 National Electrical Code
Supporting ReferenceUgly's Electrical References | any edition
Largest TopicWiring Methods and Materials | 19%
Question PaceAbout 3 minutes per question
Missouri Master Electrician and Electrical Contractor Licensing Path
The correct path depends on whether you are pursuing a local Master Electrician credential or Missouri's statewide Electrical Contractor license.
Local Master path: confirm the city or county, experience requirement, accepted exam and code edition.
Springfield example: prepare for W16_MO_S using the 2017 NEC and Ugly's Electrical References.
Statewide contractor path: use an OSEC-approved examination and satisfy the applicable experience, education, insurance and application requirements.
Career distinction: Master Electrician and Electrical Contractor can overlap in professional responsibility, but they are not the same Missouri credential.
Springfield W16 Master Electrician Exam Topics
These weight bars use the published Springfield W16_MO_S blueprint.
Wiring Methods and Materials19%
Services and Service Equipment16%
Branch Circuits and Conductors16%
General Knowledge and Plan Reading12%
Special Occupancies, Equipment and Conditions12%
Equipment and Devices10%
Motors and Generators8%
Feeders4%
Control Devices3%
Missouri Master Electrician Reference Strategy
Current-code education and test-specific references serve different purposes. Use both correctly.
| Resource / Exam | Reference | Best Use |
|---|---|---|
| Springfield W16_MO_S | 2017 National Electrical Code | Primary test-specific code reference |
| Springfield W16_MO_S | Ugly's Electrical References | Supporting formulas, calculations and quick electrical reference |
| 2026 Missouri Master Study Package | 2026 National Electrical Code | Current-code education and advanced master-level study |
| Master Electrician Study Guide | Master-level review | Theory, code concepts, installations and exam-style preparation |
| Calculations Study Guide | Advanced electrical calculations | Services, feeders, motors, conductors, voltage drop, raceway fill and box fill |
Your Missouri Master Electrician Licensing Roadmap
Identify the licensing authority, match the exam and NEC edition, prove the required experience, and separate local Master Electrician licensing from statewide Electrical Contractor licensure.
1
Choose the license goal
Decide whether you need a local Master Electrician credential, Missouri statewide Electrical Contractor license or both.
2
Confirm the exact approved exam
Verify Springfield W16 or another master-level examination accepted by your licensing authority.
3
Match the code edition
Use the exact NEC edition assigned to your examination while also using current NEC training for broader professional development.
4
Document experience and education
Complete the local or statewide experience, apprenticeship, degree or supervisory documentation required for your path.
5
Study master-level calculations
Practice services, feeders, loads, motors, transformers, conductor sizing, voltage drop, raceway fill and box fill.
6
Build open-book speed
Train to handle 100 questions in 300 minutes while checking NEC tables, notes, exceptions and calculations efficiently.
7
Complete licensing
Submit the local Master Electrician certification or Missouri statewide Electrical Contractor application and supporting documents.
Six-Week Missouri Master Electrician Exam Prep Plan
Week 1
Exam and NEC Setup
- Confirm W16 or another approved exam
- Get the correct NEC edition
- Review the blueprint
- Take a diagnostic master exam
Week 2
Wiring Methods and Branch Circuits
- Raceways and cables
- Boxes and enclosures
- Branch-circuit calculations
- Overcurrent and conductor sizing
Week 3
Services, Feeders and Grounding
- Service calculations
- Feeders
- Grounding and bonding
- Transformers and fault current
Week 4
Equipment and Motors
- Equipment and devices
- Motors and generators
- Control devices
- Heating and cooling equipment
Week 5
Plans and Special Conditions
- Plan reading
- General load calculations
- Special occupancies
- Emergency, signaling and fire alarm systems
Week 6
Five-Hour Simulation
- 100-question practice exams
- Three-minute question pace
- Advanced calculation review
- Final weak-area study
Missouri Master Electrician Open-Book Exam Prep Strategy
Do this during exam prep
- Use the exact NEC edition assigned to the exam
- Practice plan reading and advanced calculations
- Learn high-use NEC tables and definitions
- Check notes and exceptions carefully
- Use Ugly's efficiently where allowed
- Complete full five-hour simulations
Avoid these mistakes
- Assuming the newest NEC is the exam edition
- Studying only memorization and skipping calculations
- Ignoring service and branch-circuit math
- Spending too long on one complex question
- Confusing local Master licensing with statewide contractor licensing
- Scheduling before confirming experience eligibility
Open-book strategy: 100 questions in 300 minutes averages about 3 minutes per question. Solve direct knowledge questions quickly, use targeted NEC lookups for code questions, and flag longer calculations so they do not consume the entire exam.
Missouri Master Electrician Contractor Exam Prep Options
2026 Master Electrician Study Package
Current NEC + Instructor-Led Master Prep
- 2026 NEC instruction
- Master Electrician study guide
- Calculations study guide
- Simulated practice exams
- Live and recorded instruction
Springfield W16 Exam Prep
2017 NEC Test-Specific Preparation
- W16 blueprint alignment
- 2017 NEC reference
- Ugly's Electrical References
- Open-book navigation
- Five-hour exam strategy
Master + Calculations + NEC Combo
Advanced Electrical Calculation Prep
- Master-level study guide
- Electrical calculations
- NEC code study
- Service and feeder calculations
- Conductor, motor and transformer practice
Master Electrician and Statewide Electrical Contractor Are Different Missouri Credentials
A local Master Electrician credential demonstrates advanced electrical knowledge and may support supervisory or contractor responsibilities. Missouri's statewide Electrical Contractor license is a separate state credential with its own application and qualification requirements.
· Springfield W16: 100 questions, 5 hours, 75% passing
· Springfield W16 references: 2017 NEC + Ugly's
· Missouri accepts approved master-level exams for statewide contractor licensing
· Statewide experience and education pathways vary
· Statewide Electrical Contractor license renews on a three-year cycle
Missouri Master Electrician Contractor Exam Prep FAQ
Springfield W16_MO_S Master Electrician
No. Missouri's statewide credential is the Electrical Contractor license. Master Electrician credentials are commonly issued by local political subdivisions, while Missouri accepts approved master-level examinations for statewide Electrical Contractor licensing.
Springfield uses the ICC W16_MO_S Master Electrician examination.
The current Springfield ICC bulletin lists 100 multiple-choice questions.
The current Springfield ICC bulletin allows 5 hours, or 300 minutes.
Yes. The current Springfield ICC bulletin lists the W16 exam as open book.
ICC states that the Master Electrician examination requires 75 percent of the questions to be answered correctly to pass. Local licensing agencies may impose their own additional requirements.
The current Springfield W16 exam uses the 2017 National Electrical Code.
The current Springfield bulletin lists Ugly's Electrical References, with any edition accepted.
Wiring Methods and Materials is the largest published category at 19 percent.
The current published blueprint assigns 16 percent to Services and Service Equipment.
The current published blueprint assigns 16 percent to Branch Circuits and Conductors.
The current published blueprint assigns 12 percent to General Knowledge and Plan Reading.
The current published blueprint assigns 12 percent to Special Occupancies, Equipment and Conditions.
The current published blueprint assigns 10 percent to Equipment and Devices.
The current published blueprint assigns 8 percent to Motors and Generators.
The current published blueprint assigns 4 percent to Feeders.
The current published blueprint assigns 3 percent to Control Devices.
With 100 questions in 300 minutes, the average pace is about 3 minutes per question.
Missouri Statewide Electrical Contractor Licensing
No. Missouri's statewide Electrical Contractor license is a separate state contractor credential. Local jurisdictions may issue Master Electrician licenses or certifications.
Missouri's published approved-examinations list includes approved Master Electrician examinations from ICC, Prov, Prometric and PSI, along with other approved contractor-level examination options.
Missouri's published list includes ICC Master Electrician G16 based on the 2017 code cycle and F16 based on the 2014 code cycle.
Yes. Missouri states that a previously passed approved Electrical Contractor, Master Electrician or Journeyman Electrician examination may be used as evidence of meeting the examination requirement, subject to Office review.
Missouri publishes several routes based on practical electrical experience, apprenticeship education, qualifying college education, supervisory experience or long-term qualifying local licensure.
The statewide Electrical Contractor license follows a three-year renewal cycle.
No. The City of St. Louis maintains its own Committee of Electrical Examiners and evaluates applicants through its own written and oral examination process.
Master-Level Study Strategy
The 2026 NEC package provides current-code education and advanced master-level study. Springfield W16 candidates should still prepare with the exact 2017 NEC used by their exam.
Start with Wiring Methods and Materials, Services and Service Equipment, and Branch Circuits and Conductors. Those three areas make up 51 percent of the published W16 blueprint.
Yes. Master-level preparation should include service and feeder calculations, conductor sizing, load calculations, motors, transformers, voltage drop, box fill, raceway fill and other NEC-based calculations.
Yes. Grounding and bonding are important across services, branch circuits, equipment, generators, special conditions and other NEC questions even though they are not a separate percentage category.
Use the exact references assigned to your exam. Current-code study is valuable, but it does not replace the NEC edition used to write the specific examination.
Master Electrician exam prep focuses on advanced NEC application, calculations, supervision-level knowledge and local master licensing. Statewide Electrical Contractor licensing adds state application, experience, insurance and approved-examination requirements.
Confirm the licensing authority, exact examination, NEC edition, allowed references, question count, time limit, passing score, experience requirements and whether the exam will be used for local Master Electrician licensing or statewide Electrical Contractor licensure.
1 Exam Prep Master Electrician Exam Prep 2026 NEC Updates
Explore Missouri Master Electrician Contractor Exam Prep Resources
2026 Missouri Master Electrician Study Package Springfield W16 Master Electrician Exam Prep Missouri Master + Calculations + NEC Combo Missouri Master Study Guide + Flash Cards Missouri Office of Statewide Electrical Contractors Missouri Electrical Contractor FAQ Missouri Approved Electrical Examinations Missouri Statewide Electrical Application Instructions Missouri Electrical Contractor Renewal Information ICC Springfield Contractor/Trades Bulletin ICC National Contractor/Trades Bulletin ICC Master Electrician Passing Score Guidance St. Louis Committee of Electrical Examiners St. Louis County Electrical Licensing
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