Who Can Qualify for the 07C Master Exam?

Washington requires a specialty master electrician candidate to have possessed a valid electrician certificate in the specialty being applied for for at least two years.

For this credential, that means you must already hold the Washington 07C Restricted Nonresidential Maintenance electrician certificate and have held it for the required period before taking the master examination.

The Master Certificate Replaces the Matching 07C Electrician Certificate

When Washington issues a master electrician certificate, it replaces the electrician certificate held for the same certification category.

That means you do not keep a separate 07C electrician certificate alongside a 07C master certificate for the same specialty.

What Can a 07C Master Electrician Do?

A Washington master electrician may work with the tools of the trade within the certificate's authorized scope. A master may also serve as the designated master/administrator for an electrical contractor when assignment requirements are met.

For a 07C master, that can combine hands-on restricted maintenance work with contractor-level responsibility.

• Perform 07C maintenance work within specialty limits
• Perform 07A and 07B crossover work allowed to 07C
• Supervise qualifying work under Washington certification rules
• Help ensure code compliance
• Help ensure contractor compliance with RCW and WAC
• Review scope, permits, inspections, and worker credentials
• Serve as designated master/administrator for a matching contractor when properly assigned

What Is the 07C Restricted Nonresidential Maintenance Scope?

Washington allows 07C to maintain, repair, or replace like-in-kind existing electrical utilization equipment. It can also perform qualifying permit-exempt work identified in WAC 296-46B-901, with an important exception: 07C cannot repair or replace circuit breakers.

The specialty is built around existing maintenance work. It is not a license for general new electrical construction, broad branch-circuit alterations, or unlimited nonresidential maintenance.

A master should be able to look at a service call and quickly decide whether it stays inside 07C or needs a broader electrician or contractor classification.

The Main 07C Voltage and Amperage Limits

Washington sets different limits for lighting branch circuits and other qualifying circuits.

Existing Utilization Equipment Is the Center of 07C

07C allows maintenance, repair, or like-in-kind replacement of existing electrical utilization equipment. The master needs to know where that equipment ends and premises wiring begins.

Washington's rule says that, for this specialty, electrical equipment does not include electrical conductors, raceway, or conduit systems external to the equipment or whip.

That boundary matters because a service technician can start by replacing a failed equipment component and end up modifying raceway or building wiring if the job is not controlled carefully.

Circuit Breaker Repair and Replacement Are Outside 07C

One of the most important 07C restrictions involves circuit breakers. Washington's permit-exempt rule allows certain basic electrical work without a permit, but the 07C specialty specifically excludes circuit-breaker repair or replacement.

A 07C master should understand this distinction well because it is both an exam topic and a contractor-compliance issue.

Lighting Maintenance Has Special Rules

07C allows qualifying lighting maintenance, but luminaire replacement is generally limited to in-place replacement when an existing luminaire has failed to operate.

Suspended lay-in luminaires have a narrow relocation allowance. The original field-installed luminaire supply whip cannot be extended or relocated to a new supply point.

If a manufactured wiring assembly supplies the luminaire, the fixture may be relocated no more than eight feet, provided the manufactured wiring assembly circuiting is not changed.

This is maintenance flexibility, not permission to redesign the lighting system.

The Six-Foot Whip Rule

07C may disconnect and reconnect low-voltage control and line-voltage supply whips not over six feet in length when the characteristics of the branch circuit or whip are not modified.

The rule helps a maintenance electrician service existing equipment without turning the job into a new branch-circuit installation.

At master level, memorize the number and the condition. Six feet by itself is not enough. The branch circuit and whip characteristics must stay unchanged.

07C Can Also Perform 07A and 07B Work

Washington expressly allows 07C to perform work defined for:

• 07A Nonresidential Lighting Maintenance and Lighting Retrofit
• 07B Residential Maintenance

PSI specifically warns candidates that specialty exams can include work from another specialty when Washington law permits that crossover. The current bulletin even uses 07C and 07B as an example.

That means a 07C Master candidate should study the crossover scopes deliberately instead of treating them as extra reading.

What the 07A Crossover Adds

07A focuses on nonresidential lighting maintenance and lighting retrofit work within existing luminaires. It includes maintenance, service, repair, ballast replacement, socket replacement, and qualifying retrofit work inside the existing luminaire housing.

It does not authorize new branch circuits, general new luminaire installations, or ordinary relocation of existing luminaires.

Because 07C can perform 07A work, a 07C master should know these rules when supervising commercial lighting maintenance contracts.

What the 07B Crossover Adds

07B Residential Maintenance allows qualifying maintenance, repair, and like-in-kind replacement work in residential occupancies. Its equipment and circuit limits are generally 250 volts, 60 amperes, single phase.

07B also contains a six-foot control and supply-whip allowance and limits external conductors, raceways, and conduit systems outside the equipment or whip.

Since 07C may perform 07B work, master candidates should expect residential-maintenance concepts to appear in practice materials and potentially on the exam.

Classified-Location Work Is Outside 07C

Washington excludes work governed by NEC Articles 500, 501, 502, 503, 504, 505, 510, 511, 513, 514, 515, and 516 from 07C.

The current master exam still assigns about one question to Hazardous Locations. That means the master needs enough code knowledge to identify the location and enough licensing knowledge to know that 07C cannot perform the work.

Plumbing Work Is Outside 07C

Washington also excludes plumbing work regulated under Chapter 18.106 RCW from this electrical specialty.

Maintenance work often happens around mechanical equipment where electrical and plumbing components are close together. A 07C master needs to know which side of that line the contractor is allowed to work on.

The Current 07C Master Exam at a Glance

Current 07C Master Exam Blueprint

General Trade Knowledge & Theory is the largest individual category at about seven questions. Overcurrent Protection, Grounding & Bonding, and Motors/HVAC/Generators/Transformers contribute about four each. Wiring Methods, Electrical Equipment, and Special Occupancies contribute about three each.

No Separate Major Load Calculations Section

Washington's General Master Electrician exam includes a separate Major Load Calculations section. The current 07C Restricted Nonresidential Maintenance Master exam does not.

That does not mean the exam is math-free. General Trade Knowledge & Theory can still include practical electrical calculations involving voltage, current, resistance, power, equipment ratings, and basic theory.

The difference is that 07C Master has only the NEC & Theory section and Washington Codes section.

General Trade Knowledge and Theory Are About Seven Questions

General Trade Knowledge & Theory is the largest single category on the current 07C Master technical outline.

• Voltage
• Current
• Resistance
• Power
• Ohm's law
• Basic AC theory
• Series and parallel relationships
• Motor and control fundamentals
• Equipment ratings
• Electrical measurements
• Troubleshooting logic
• Basic trade calculations

At master level, theory needs to be fast. You do not want to spend two hours asking the same calculator whether Ohm's law has changed its mind.

Overcurrent Protection Is About Four Questions

NEC 240 contributes about four questions. Review conductor protection, equipment protection, fuse and breaker ratings, standard ratings, and how overcurrent devices interact with existing utilization equipment.

The license boundary matters here. A 07C master needs to understand circuit breakers even though the specialty expressly excludes their repair or replacement.

Grounding and Bonding Are About Four Questions

NEC 250 contributes about four questions. Study equipment-grounding conductors, bonding, fault-current paths, metal enclosures, grounding connections, and how maintenance work affects existing grounding and bonding systems.

A maintenance repair can look small but still create a serious fault-current problem if the equipment is not reconnected correctly.

Motors, HVAC, Generators, and Transformers Are About Four Questions

NEC 430-450 contributes about four questions. Restricted nonresidential maintenance work commonly happens around motors, contactors, relays, overload devices, transformers, HVAC-related equipment, and generators.

• Motor ratings
• Overload protection
• Motor controls
• Contactors and relays
• Transformer basics
• Generator-related concepts
• Equipment nameplates
• Maintenance and replacement boundaries

Wiring Methods and Electrical Equipment Are About Three Questions Each

NEC 300-398 contributes about three questions, and NEC 400-427 plus 455-480 contributes about three more.

A 07C master should understand boxes, fittings, flexible connections, conductor protection, wet and damp locations, physical damage, equipment ratings, disconnecting concepts, and proper connections to existing utilization equipment.

The technical rule and the licensing rule work together. Knowing how a raceway should be installed does not mean the 07C contractor can extend it.

Special Occupancies Are About Three Questions

NEC 517-590 contributes about three questions. This category matters because restricted maintenance contractors may service equipment in many different nonresidential buildings.

Review the NEC structure for special occupancies so you can recognize when healthcare, assembly, agricultural, temporary, or other special conditions change the rules around the equipment being maintained.

Smaller NEC Categories Still Matter

The master outline also includes smaller categories covering Introduction, General Requirements, Wiring & Protection, Hazardous Locations, Special Equipment, Emergency & Standby Systems, Special Conditions, and Communication Systems.

One or two questions may sound small until you are staring at question 39 and wishing you had reviewed that article once.

Use the PSI blueprint as a checklist. Give every listed category at least enough study time that you know where it lives.

The Washington Codes Section Has 20 Questions

The master Washington Codes section contains about 20 questions and allows one hour. This is larger than the matching 07C Administrator and Electrician Washington-law sections.

Study:

• Chapter 19.28 RCW
• Chapter 296-46B WAC
• WAC 296-46B-901 permit-exempt work
• WAC 296-46B-920 07C, 07A, and 07B scopes
• Master electrician qualification rules
• Contractor licensing
• Master/administrator assignment
• Electrician and trainee certification
• Supervision rules
• Permits and inspections
• Examination rules
• Renewal and continuing education

Twenty Washington-law questions means state rules deserve a real study block, not ten hurried minutes the night before the exam.

The Current Exam Is Open Book

PSI currently identifies Washington electrical examinations as open book. Law, rule, and code questions are based on the 2020 National Electrical Code, current RCW 19.28, and current WAC 296-46B.

Original copyrighted references may be highlighted, underlined, and permanently tabbed before the examination. Printed Washington RCW and WAC material is allowed when prepared in the required binder format.

Removable tabs, sticky notes, and writing in the references during the examination are not permitted. A silent nonprinting nonprogrammable calculator is permitted.

Current Exam NEC vs. Current Field NEC

Washington currently uses the 2023 NEC for field installations and inspections. L&I has announced that the 2026 NEC will replace the current 2023 edition on December 31, 2026.

The current PSI exam bulletin still bases Washington electrical exam questions on the 2020 NEC.

• For test day: follow the current PSI/L&I exam-reference instructions.
• For field work: follow the electrical code edition and Washington amendments currently adopted for installations.

The Three Core Master References

A practical 07C Master study set begins with:

• 2020 National Electrical Code for the current exam
• RCW Chapter 19.28
• WAC Chapter 296-46B

The Washington General Master Electrician Book Package contains these same three core Washington master-level references. It is broader than the 07C exam, so use the current 07C master blueprint and specialty rules to focus your study.

Open-Book Strategy for the Master Exam

The 07C Master exam gives two hours for 40 NEC/Theory questions and one hour for 20 Washington Codes questions. That is a fairly quick pace for a master-level open-book exam.

1. Memorize the main scope limits. Know 277 V/20 A lighting, 250 V/60 A other circuits, six-foot whips, and the eight-foot luminaire rule.
2. Memorize the circuit-breaker exclusion.
3. Study 07A and 07B crossover scope.
4. Tab NEC 240, 250, motor articles, and the 300-series wiring-method sections you use most.
5. Practice theory and electrical math without constant book lookup.
6. Study WAC 296-46B-901 and 920 carefully.
7. Review master assignment, contractor licensing, permits, and worker certification.
8. Practice 40-question technical sections in two hours and 20-question Washington Codes sections in one hour.

Apply Through Labor & Industries Before PSI

Master candidates must apply through Washington Labor & Industries before scheduling the master examination. L&I reviews the application and verifies that the candidate has held the matching specialty electrician certificate for the required two years.

Once the application is approved, L&I provides instructions for scheduling the examination with PSI. Washington also states that out-of-state credit cannot be used to qualify for a master electrician examination.

Approved candidates must complete the required examination within the applicable examination period.

Current Retest Rules

Washington currently requires a two-week wait after a failed examination attempt before the candidate can retest.

If an individual fails a part of a master electrician examination three times within a one-year period, that person must wait three months before retaking the failed portion.

Study the diagnostic report instead of immediately trying the same strategy again. Repeating the same mistakes three times is a very expensive study method.

Current Exam and Master Application Fees

PSI currently charges $65 for a three-hour examination. The 07C Master exam totals three section-hours.

Washington's current fee schedule lists the Master Electrician exam application, original certificate, and processing fee at $204.60. The current fee schedule states that $44.20 of that application amount is nonrefundable after submission.

Fees can change, so verify the current PSI amount and WAC 296-46B-909 fee schedule before payment.

Using the Master Certificate as a Contractor's Designated Master

A master electrician can be assigned as the designated master/administrator for an electrical contractor when the contractor and assignment satisfy Washington requirements.

Washington requires the designated master or administrator to be a member of the firm carrying out the required duties or a qualifying full-time supervisory employee.

The current assignment or unassignment fee is $53.00. L&I also requires a master electrician to report changes in assignment status.

Assignment is a real compliance job. The master should be involved in scope, worker credentials, permits, inspections, and electrical-rule compliance rather than simply donating a certificate number to the company letterhead.

Renewal and Continuing Education

Washington master electrician certificates renew every three years and expire on the certificate holder's birthdate.

A normal three-year certification period currently requires 24 hours of approved continuing education:

• At least 8 hours of code update
• At least 4 hours of RCW/WAC review
• 12 additional hours of approved continuing education

Current master renewal is $175.70 online or $202.20 by mail, fax, or in person.

If the master certificate is more than 90 days past expiration, Washington requires reapplication and another master examination to reinstate it.

A Practical 07C Master Study Plan

1. Start with WAC 296-46B-920. Learn 07C, then study 07A and 07B crossover scope.
2. Read WAC 296-46B-901. Understand permit-exempt work and the circuit-breaker exception.
3. Memorize 277 V/20 A, 250 V/60 A, six feet, and eight feet.
4. Practice General Trade Knowledge & Theory. It is the largest technical category.
5. Study NEC 240 and NEC 250.
6. Study motors, controls, transformers, wiring methods, and equipment.
7. Review Special Occupancies and smaller blueprint categories.
8. Study contractor licensing, master assignment, permits, inspections, and certification rules.
9. Take 40-question NEC/Theory practice sections in two hours.
10. Take 20-question Washington Codes practice sections in one hour.

Study Like an Installer and a Contractor Master

Master-level study should look at every service call twice. First, look at it as an electrician. What failed? What are the voltage and amperage? Is the equipment existing? Is the work like in kind? Are grounding, bonding, overcurrent protection, motors, controls, emergency systems, or special occupancy rules involved?

Then look at it as the person responsible for contractor compliance. Is the technician about to replace a circuit breaker? Modify a branch circuit? Extend raceway? Move a luminaire beyond the allowed condition? Work in a classified location? Perform plumbing? If so, the job may need a different certificate or contractor classification.

Review the Washington Nonresidential Maintenance Restricted Master Electrician 07C collection for specialty-focused preparation.

For the core master-level code and law references, review the Washington General Master Electrician Book Package. For licensing support, review 1ExamPrep application services. For books, testing costs, licensing expenses, and related professional costs, review 1ExamPrep financing options.

Frequently Asked Questions

Conclusion

The Washington Restricted Nonresidential Maintenance Master Electrician 07C certificate is the master-level credential for experienced 07C specialty electricians. It allows continued hands-on work within the specialty and can support contractor master/administrator responsibility when the holder is properly assigned.

The eligibility rule is straightforward. Washington requires a specialty master electrician applicant to have possessed a valid electrician certificate in the specialty being applied for for at least two years. For 07C, that means holding the Washington Restricted Nonresidential Maintenance electrician certificate for the required period.

Washington also states that out-of-state credit cannot be used to qualify for the master electrician examination. Labor & Industries reviews the master application and verifies eligibility before the candidate schedules with PSI.

When the master certificate is issued, it replaces the electrician certificate for the same category. The master can continue working with the tools of the trade inside 07C and can serve as the designated master/administrator for a matching contractor when assignment rules are satisfied.

The scope remains restricted. 07C may maintain, repair, or replace like-in-kind existing utilization equipment and perform qualifying permit-exempt work, but it does not authorize broad new electrical construction.

The main scope numbers matter. Lighting branch circuits are limited to 277 volts and 20 amperes. Other qualifying equipment and circuits are limited to 250 volts and 60 amperes. Control and supply whips are limited to six feet when disconnected and reconnected without changing circuit characteristics.

Lighting maintenance includes a narrow relocation rule. Failed luminaires may generally be replaced in place. A lay-in luminaire supplied by a manufactured wiring assembly may be relocated no more than eight feet if the circuiting is not changed.

Circuit breakers are one of the biggest 07C compliance traps. Washington may treat certain breaker replacement as permit-exempt basic work, but the 07C specialty expressly excludes repair or replacement of circuit breakers. A master needs to know the difference between permit rules and scope rules.

The specialty also has crossover authority. 07C may perform 07A Nonresidential Lighting Maintenance and Lighting Retrofit work and 07B Residential Maintenance work. PSI specifically warns that specialty exams can test crossover work, so master candidates should study those scopes too.

Important exclusions remain. External conductors, raceway, and conduit systems outside the equipment or whip are not part of the maintenance equipment for this specialty. Classified-location work identified in the 07C rule is excluded, and regulated plumbing is outside the specialty.

The current 07C Master exam has two sections. NEC and Theory contains about 40 scored questions and allows two hours. Washington Codes contains about 20 scored questions and allows one hour. The current published total is 60 scored questions across three section-hours.

There is no separate Major Load Calculations section for 07C Master. General Trade Knowledge & Theory is the largest technical category at about seven questions. Overcurrent Protection, Grounding & Bonding, and Motors/HVAC/Generators/Transformers contribute about four each.

Wiring Methods, Electrical Equipment, and Special Occupancies contribute about three questions each. Several smaller NEC categories contribute one or two questions. The blueprint is broad enough that candidates should practice navigation across the NEC rather than overstudying one favorite chapter.

The Washington Codes section contains about 20 questions. Study master qualification, contractor licensing, master assignment, worker certification, permits, inspections, 07C scope, 07A/07B crossover, permit-exempt work, examination rules, renewal, and continuing education.

The current PSI bulletin identifies Washington electrical examinations as open book. It bases questions on the 2020 National Electrical Code, current RCW 19.28, and current WAC 296-46B. Original copyrighted materials may be permanently tabbed, highlighted, and underlined under the current test rules.

Washington field work currently uses the 2023 NEC, while the licensing exam bulletin still uses the 2020 NEC. L&I says the 2026 NEC will replace the current 2023 edition on December 31, 2026. Candidates should therefore confirm the official exam reference shortly before testing.

The current passing score is 70 percent. Failed attempts require a two-week wait before retesting, and three failures of an examination part within a one-year period trigger a three-month wait before another attempt at that failed part.

PSI currently lists $65 for a three-hour examination. Washington's current fee schedule lists $204.60 for the Master Electrician exam application, original certificate, and processing fee.

If the master is assigned to an electrical contractor, Washington currently charges $53 for assignment or unassignment of the master/administrator designation. The assignment carries real compliance responsibility.

Master electrician certificates renew every three years on the holder's birthdate. Current renewal requires 24 hours of approved continuing education during a normal three-year period, including at least eight hours of code update and four hours of RCW/WAC review. Current master renewal is $175.70 online or $202.20 by mail, fax, or in person.

Strong 07C Master preparation combines maintenance skill with licensing judgment. Learn the equipment, the code, the crossover work, and the contractor rules. Then learn exactly where Restricted Nonresidential Maintenance ends. At master level, knowing when to stop is just as important as knowing how to fix the equipment.

Key Takeaways

• Washington 07C Master candidates must have held the matching Washington 07C specialty electrician certificate for at least 2 years, and out-of-state credit cannot be used to qualify for the master exam.
• The current master exam has about 40 NEC/Theory questions in 2 hours plus 20 Washington Codes questions in 1 hour, for 60 published scored questions.
• The exam is open book, currently uses the 2020 NEC plus current RCW 19.28 and WAC 296-46B, and has no separate Major Load Calculations section.
• 07C remains a restricted maintenance specialty with 277 V/20 A lighting limits, 250 V/60 A limits for other qualifying circuits, 07A/07B crossover authority, and a specific prohibition on circuit-breaker repair or replacement.
• The current master application fee is $204.60, and master certificates renew every 3 years with continuing education requirements.

Plain-Language Summary

Washington's Restricted Nonresidential Maintenance Master Electrician 07C certificate is the master-level credential for people who already hold the 07C specialty electrician certificate.

To qualify for the master exam, you currently need to have held the matching valid Washington specialty electrician certificate for at least two years.

Washington does not allow out-of-state credit toward qualifying for the master electrician exam. You apply through Labor & Industries first. L&I verifies your eligibility before you schedule with PSI.

Once issued, the 07C master certificate replaces the matching 07C electrician certificate.

A 07C Master Electrician can continue doing hands-on work within the specialty. The master can also serve as the designated master/administrator for a matching electrical contractor when assignment rules are met.

The specialty covers maintenance, repair, and like-in-kind replacement of qualifying existing electrical utilization equipment. It can also cover qualifying permit-exempt work, but circuit-breaker repair and replacement are specifically excluded.

For lighting branch circuits, 07C is limited to 277 volts and 20 amperes. For other qualifying equipment and circuits, the limit is 250 volts and 60 amperes.

Qualifying low-voltage control and line-voltage supply whips can be disconnected and reconnected when they are no more than six feet long and the circuit characteristics are not changed.

Lighting maintenance has special rules. Failed luminaires can generally be replaced in place. A suspended lay-in luminaire supplied by a manufactured wiring assembly can be relocated no more than eight feet if the circuiting is not changed.

07C can also perform work defined for 07A Nonresidential Lighting Maintenance and Lighting Retrofit and 07B Residential Maintenance. That crossover matters because PSI can test work that the 07C classification is legally allowed to perform.

07C does not authorize broad premises wiring. External conductors, raceways, and conduit systems outside the equipment or whip are outside the ordinary specialty scope. Classified-location work listed by Washington and regulated plumbing work are outside 07C too.

The current 07C Master exam has 40 NEC and Theory questions and allows two hours. The Washington Codes section has 20 questions and allows one hour. That is 60 published scored questions across three section-hours.

There is no separate Major Load Calculations section. General Trade Knowledge & Theory is the largest category at about seven questions. Overcurrent Protection, Grounding & Bonding, and Motors/HVAC/Generators/Transformers are about four questions each.

Wiring Methods, Electrical Equipment, and Special Occupancies are about three questions each. Several other NEC topics contribute one or two questions.

The exam is open book and currently uses the 2020 National Electrical Code, current RCW 19.28, and current WAC 296-46B. Washington field work currently uses the 2023 NEC, so check the official exam bulletin before test day.

PSI currently lists $65 for a three-hour electrical examination. Washington currently lists $204.60 for the Master Electrician exam application, original certificate, and processing fee.

The master certificate renews every three years on your birthdate. A normal three-year renewal currently requires 24 hours of approved continuing education, including at least eight hours of code update and four hours of RCW/WAC review.

Use the Washington Nonresidential Maintenance Restricted Master Electrician 07C collection from 1ExamPrep to organize your preparation around restricted maintenance scope, 07A/07B crossover, the 2020 NEC exam reference, Washington law, technical maintenance topics, and master-level contractor compliance.