Prepare for the Washington Residential Maintenance Master Electrician examination with a focused reference package built around the electrical code, Washington electrical law, and state administrative rules used for the 07B Residential Maintenance specialty. This package includes the Revised Code of Washington (RCW) Chapter 19.28, Washington Administrative Code (WAC) Chapter 296-46B, and the National Electrical Code, NEC, 2020 Edition.
Washington officially identifies this specialty as 07B Residential Maintenance. The classification is designed for defined maintenance, repair, and like-in-kind replacement work involving existing electrical utilization equipment in qualifying residential occupancies. The scope is intentionally narrower than a general electrical certification and includes specific limits on voltage, amperage, phase, equipment, wiring, and the types of residential properties where work may be performed.
The Washington 07B Master Electrician examination tests National Electrical Code knowledge, general electrical theory, and Washington electrical laws and rules. Candidates should be prepared for subjects involving general NEC requirements, wiring and protection, overcurrent protection, grounding and bonding, wiring methods, electrical equipment, motors and HVAC equipment, special equipment, emergency and standby systems, and Washington-specific licensing and specialty requirements.
Washington electrical examinations are open book. Approved reference materials may be used during testing, making efficient code navigation an important part of preparation. Candidates should be able to recognize whether a question belongs in the NEC, RCW Chapter 19.28, or WAC Chapter 296-46B and locate the controlling provision efficiently.
The 07B specialty is limited to qualifying residential dwellings, certain multistory residential structures, and the interior of dwelling units in certain mixed-use multistory structures. It also limits work to equipment and circuits within specific electrical ratings. Understanding these boundaries is important for both the Master Electrician examination and work performed under the specialty after certification.
This package combines the three primary references needed for organized preparation. The NEC provides national technical electrical requirements, RCW Chapter 19.28 establishes Washington electrical law, and WAC Chapter 296-46B contains the detailed rules governing specialty classifications, certification, Master Electricians, examinations, contractors, permits, inspections, and electrical installations.
The Washington 07B Residential Maintenance Master Electrician examination contains two required sections: NEC & Theory and Washington Codes.
The published NEC & Theory outline for the 07B Master Electrician examination includes approximately two questions from NEC Article 90, three from NEC Articles 100 through 110, two involving wiring and protection, three involving overcurrent protection, four involving grounding and bonding, three involving wiring methods, three involving electrical equipment, three involving motors, HVAC equipment, generators and transformers, three involving special equipment, two involving emergency and standby systems, one involving special conditions, and approximately five questions involving general trade knowledge and electrical theory.
The Washington Codes section contains approximately 20 questions involving Washington laws and administrative rules. Candidates should study Master Electrician eligibility, specialty scope, certification, contractor responsibilities, examinations, permits, inspections, assignments, and other provisions contained in RCW Chapter 19.28 and WAC Chapter 296-46B.
The Washington Residential Maintenance Master Electrician examination is an open book test. Washington Labor & Industries permits approved references in the examination center under established testing rules.
The 2020 National Electrical Code may be used. Permanent index tabs are acceptable, while removable tabs, sticky notes, and handwritten notes are prohibited. Original copyrighted reference materials may contain highlighting, underlining, and permanent index tabs when they otherwise comply with examination rules.
Printed copies of RCW Chapter 19.28 and WAC Chapter 296-46B may also be used. Printed Washington electrical laws and rules should be hole-punched and placed in a three-ring binder.
Candidates may also use an acceptable silent, nonprinting, nonprogrammable calculator that meets examination-center requirements. Electronic reference devices, phones, tablets, smart watches, and unauthorized electronic equipment are not permitted in the testing room.
Because the NEC & Theory section contains approximately 34 questions in two hours, candidates should practice locating common requirements quickly. Grounding and bonding, overcurrent protection, wiring methods, electrical equipment, motors, HVAC equipment, special equipment, and emergency systems deserve focused attention.
The Washington Codes section is equally important. Master candidates should know where to find the 07B specialty limits, certification requirements, contractor assignment rules, and other Washington-specific provisions without spending excessive time searching.
Washington Residential Maintenance Master Electrician certification is administered through the Washington State Department of Labor & Industries. A candidate pursuing a specialty Master Electrician credential must first hold the corresponding Washington specialty electrician certificate.
Washington identifies Residential Maintenance as electrical specialty classification 07B. To qualify for the specialty Master Electrician examination, an applicant must have held the corresponding Washington specialty electrician certificate for at least two years.
The underlying 07B Residential Maintenance Electrician pathway requires 2,000 hours of qualifying work experience for full certification. A trainee may become eligible for the 07B specialty examination after completing at least 720 hours of qualifying supervised work experience under Washington requirements.
Until the appropriate specialty examination is successfully completed, a trainee in this pathway must work under 100 percent supervision by an electrician certified to perform the work or by a general journey level electrician.
The 07B specialty is limited to residential dwellings as defined by Washington rules, multistory dwelling structures with no commercial facilities, and the interior of dwelling units in multistory structures that include commercial facilities.
The specialty may maintain, repair, or replace like-in-kind existing electrical utilization equipment. It may also perform permit-exempt electrical work authorized under the applicable Washington rules.
The specialty is limited to equipment and circuits with a maximum rating of 250 volts, 60 amperes, and single phase. These limits are central to the 07B classification and should be understood clearly before the examination.
The 07B specialty may disconnect and reconnect low-voltage control wiring and line-voltage supply whips that are not more than six feet in length, provided the work does not modify the characteristics of the branch circuit or the whip.
For the purposes of this specialty, electrical equipment does not include electrical conductors, raceway systems, or conduit systems located externally to the equipment or supply whip. This distinction limits the scope of work that may be performed under the 07B credential.
The specialty does not authorize unrestricted branch-circuit installation, feeder installation, service work, raceway installation, or general rewiring. Work outside the residential maintenance scope requires an appropriate electrical classification.
The 07B specialty also cannot perform plumbing work regulated under Washington plumbing law. Electrical certification does not replace any separate plumbing credential that may be required for work involving plumbing systems.
A Washington specialty Master Electrician may work with the tools of the trade within the scope of the certification. A Master Electrician may also serve as the designated master for an electrical contractor when the contractor classification and assignment requirements are satisfied.
When assigned to an electrical contractor, the Master Electrician accepts responsibility for helping ensure that the contractor complies with applicable Washington electrical laws and rules. The Master Electrician must also follow Washington requirements concerning changes in assignment status.
Candidates should use these references as an integrated study set. Technical questions may point toward the NEC, while questions involving specialty authority, Master Electrician eligibility, contractor responsibilities, or Washington licensing requirements may require the RCW or WAC.
Studying from the same references used in the examination can help candidates build familiarity with article numbers, definitions, specialty rules, tables, and commonly used provisions before test day.
General NEC Requirements: Review definitions, equipment approval, listing and labeling requirements, installation and use rules, working space, electrical connections, and other foundational NEC provisions.
Wiring and Protection: Study branch circuits, conductor requirements, identification, wiring protection, and related provisions that affect residential utilization equipment.
Overcurrent Protection: Review breakers, fuses, conductor protection, equipment ratings, branch-circuit protection, and replacement-equipment considerations.
Grounding and Bonding: Grounding and bonding is one of the larger technical content areas on the 07B Master examination. Review equipment grounding conductors, bonding, grounding continuity, enclosures, raceways, and grounding requirements associated with utilization equipment.
Wiring Methods: Study cables, raceways, boxes, fittings, flexible wiring methods, supports, conductor protection, and equipment connections. Even though the 07B work scope restricts external raceway and conductor work, candidates still need technical familiarity with applicable NEC requirements.
Electrical Equipment: Review switches, receptacles, appliances, utilization equipment, flexible cords, equipment connections, and other requirements applicable to residential maintenance work.
Motors and HVAC Equipment: Study motors, controllers, overload protection, disconnecting means, heating and cooling equipment, and equipment connections commonly encountered in residential maintenance.
Special Equipment: Review NEC requirements for equipment that may appear in residential settings, including pools, spas, electric vehicle equipment, generators, and other specialized installations addressed within the examination outline.
Emergency and Standby Systems: Study optional standby systems, generators, transfer equipment, and related residential emergency or backup-power requirements.
General Trade Knowledge and Theory: Practice voltage, current, resistance, power, Ohm's law, circuit relationships, basic electrical calculations, equipment troubleshooting, and general trade principles.
Washington 07B Scope: Know the maximum 250-volt, 60-ampere, single-phase limits and the six-foot supply-whip allowance. Understand the distinction between equipment maintenance and electrical conductors, raceways, or conduit external to equipment.
Master Electrician Responsibilities: Review certification eligibility, contractor assignment rules, compliance responsibilities, examinations, permits, inspections, and Washington licensing provisions.
A useful study approach is to sort practice questions into NEC, RCW, and WAC categories. Before opening a book, identify which reference most likely contains the answer. This helps reinforce both subject knowledge and efficient open-book navigation.
1 Exam Prep helps Washington Residential Maintenance Master Electrician candidates organize preparation around the three core references included in this package: the 2020 National Electrical Code, RCW Chapter 19.28, and WAC Chapter 296-46B.
The package supports trade-focused review of wiring and protection, grounding and bonding, overcurrent protection, electrical equipment, motors, HVAC systems, special equipment, emergency systems, electrical theory, residential maintenance scope, and Washington electrical laws and rules.
1 Exam Prep encourages practice-oriented preparation for the open-book examination. Candidates can strengthen reference-navigation skills by identifying the subject of each question, choosing the correct reference, locating the controlling provision, and applying it efficiently.
Experienced residential maintenance electricians often bring strong practical knowledge of equipment service, replacement, troubleshooting, and repair. Organized study helps connect that field experience with the exact NEC and Washington rules that govern the specialty.
Washington-specific preparation is especially important for 07B because the specialty has clear limits involving occupancy, voltage, amperage, phase, equipment, supply whips, conductors, and raceways. Master candidates should understand those limits thoroughly.
The goal is to combine hands-on residential maintenance experience with organized code study, stronger Washington regulatory knowledge, effective reference navigation, and confidence-building study structure. This Washington Residential Maintenance Master Electrician 07B Book Package provides the core materials needed to support that preparation.
Washington identifies Residential Maintenance as electrical specialty classification 07B.
This package includes RCW Chapter 19.28, WAC Chapter 296-46B, and the 2020 National Electrical Code.
Yes. Washington electrical examinations are open book under the applicable testing rules.
The published examination outline lists approximately 34 NEC & Theory questions and 20 Washington Codes questions, for approximately 54 questions total.
The NEC & Theory section allows approximately 2 hours, and the Washington Codes section allows approximately 1 hour.
Washington requires a score of at least 70% on each required examination section.
A specialty Master Electrician applicant must have held the corresponding Washington specialty electrician certificate for at least two years.
The Washington 07B Residential Maintenance specialty requires 2,000 hours of qualifying work experience for full electrician certification.
A trainee may become eligible for the 07B examination after completing at least 720 hours of qualifying supervised experience.
The trainee must work under 100 percent supervision until the applicable specialty examination has been successfully completed.
The specialty is limited to equipment and circuits with a maximum rating of 250 volts, 60 amperes, and single phase.
Yes. The specialty may disconnect and reconnect qualifying 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 specialty does not treat electrical conductors, raceways, or conduit systems external to the equipment or whip as electrical equipment within its authorized maintenance scope.
No. The 07B credential is a specialty Master Electrician certificate, and electrical work must remain within the Residential Maintenance scope unless the individual holds another certification authorizing broader work.
Yes. The 2020 NEC is permitted for the Washington electrical examination program covered by this package.
Yes. Printed copies of both Washington electrical references may be used when prepared according to Labor & Industries testing requirements.
Washington electrical examinations are administered through PSI after the applicable eligibility review and examination approval through Washington Labor & Industries.
Focus on grounding and bonding, overcurrent protection, wiring methods, electrical equipment, motors and HVAC equipment, special equipment, emergency systems, electrical theory, 07B specialty limits, and Washington electrical laws and rules.
Find answers to common questions about our exam prep courses.
No questions match your search. Try a different keyword or category.