What Is the Washington 06A HVAC/R Specialty?

Washington created the 06A specialty for electrical work that is specifically tied to HVAC and refrigeration systems.

The certificate covers qualifying low-voltage controls, telecommunications circuits, electrical components inside HVAC/R equipment, certain equipment connections, motor controls, and other work specifically authorized by the state's specialty rules.

Knowing where the HVAC/R equipment ends and the building's general electrical system begins is one of the most important skills for both the exam and real field work.

06A Is Not Limited by Voltage, Phase, or Amperage

Unlike the restricted 06B HVAC/R specialty, Washington does not place a general voltage, phase, or amperage ceiling on 06A.

Low-Voltage HVAC/R Controls Are Part of 06A

The specialty includes qualifying HVAC/refrigeration telecommunications and Class 2 low-voltage control circuits.

Depending on the occupancy and conditions, this may include:

• Thermostat wiring.
• Class 2 HVAC control circuits.
• Control boards and associated wiring.
• HVAC/R telecommunications circuits.
• Sensors and control components.
• Control wiring associated with air handlers, furnaces, condensers, heat pumps, refrigeration systems, and related equipment.

Washington allows broad repair, replacement, and maintenance authority for qualifying HVAC/R low-voltage circuits. New installations in nonresidential occupancies have additional conditions tied to the building and the existing space.

06A Can Work on Line-Voltage Components Inside HVAC/R Equipment

The specialty allows installation, repair, replacement, and maintenance of qualifying line-voltage components located within HVAC/refrigeration equipment.

This can include manufacturer-authorized internal components and accessories associated with the HVAC/R system.

Examples can include:

• Internal electrical controls.
• Contactors and relays located within qualifying equipment.
• Factory-authorized accessories.
• Internally mounted outlets authorized by the equipment manufacturer.
• Product-illumination luminaires located inside and powered from qualifying refrigeration equipment.

Internal Disconnect and Controller Components

06A may repair, replace, or maintain internal components of HVAC/refrigeration equipment disconnecting means or controllers when the disconnect or controller is not located within a motor control center or panelboard.

This authority is different from installing general external line-voltage controllers or disconnect switches.

When you study a scope question, pay attention to where the component is physically located. "Inside the HVAC equipment" and "mounted somewhere nearby on the building" can produce completely different licensing answers.

The Six-Foot Flexible Supply Whip Rule

Washington allows 06A electricians to repair, replace, or maintain qualifying line-voltage flexible supply whips that are not more than six feet long.

The work generally cannot change the characteristics of the supplying branch-circuit or feeder load, other than a permitted reduction in the HVAC unit's rated maximum overcurrent protection size.

The raceway method of the replacement whip does not have to remain identical when another approved method is used.

Short Raceway Sections for Low-Voltage Protection

The 06A specialty may install, repair, replace, and maintain short sections of raceway when they are used to physically protect low-voltage cables.

Washington limits what counts as a short protective section. It cannot mechanically interconnect two devices, junction boxes, equipment pieces, or other components.

This rule allows practical physical protection without turning the HVAC/R specialty into a general raceway-installation classification.

Gas-Piping Bonding Authority

Washington also allows 06A to install a bonding conductor for metal gas piping to an existing accessible grounding electrode conductor or grounding electrode when the terminations can be made outside electrical panelboards, switchboards, or other distribution equipment.

This is a specific HVAC/R specialty allowance. It should not be interpreted as general authority to modify a building's entire grounding electrode or distribution system.

Important 06A Scope Limits

The broad HVAC/R scope still has clear limits.

06A generally may not install line-voltage controllers or disconnect switches external to HVAC/refrigeration equipment.

Washington provides a narrow exception when HVAC/R equipment is being replaced. Under specific conditions, the specialty may replace a surface-mounted disconnecting means enclosure with a qualifying like-in-kind enclosure and may install a limited amount of raceway for cable protection.

06A generally does not include:

• Integrated building-control systems that are not HVAC/refrigeration systems.
• General building or structure lighting.
• General raceway and conduit systems.
• Line-voltage service conductors.
• General feeder conductors.
• General branch-circuit conductors.
• Panelboards external to the HVAC/R system.
• Switchboards external to the HVAC/R system.
• Motor control centers external to the HVAC/R system.
• Classified-location wiring located outside the HVAC/R equipment where the listed hazardous-location rules apply.

Questions about specialty scope often turn on one small detail, so read every word before deciding that a familiar HVAC component automatically makes the job 06A work.

06A vs. Restricted HVAC/R 06B

Washington's 06B HVAC/Refrigeration Restricted specialty has a narrower electrical scope.

06B is restricted based on the primary electrical power connection to the HVAC/R system. 06A does not have those general voltage, phase, and amperage limits.

There is also a useful experience pathway between the two certificates. Washington allows the 2,000 hours required for full 06B certification to count as 2,000 hours toward the 4,000 hours required for 06A certification.

That can make 06B a practical earlier step for someone whose work initially stays inside the restricted specialty.

06A Requires 4,000 Hours of Qualifying Experience

The current Washington experience table requires 4,000 qualifying work-experience hours for both 06A examination eligibility and full certification.

The 06A specialty is not eligible for the zero-percent unsupervised modified trainee pathway used by certain 2,000-hour specialties.

Keep Good Experience Records

Labor & Industries reviews work-experience records before approving a specialty electrician candidate to test.

Keep accurate records showing:

• Your employer.
• Your dates of employment.
• Your qualifying HVAC/R electrical hours.
• The type of electrical work performed.
• Your supervising electrician.
• The specialty under which the work was performed.

Do not wait until application day to reconstruct two years of electrical work from memory, old text messages, and whatever your brain thinks happened during one rainy Tuesday in March.

For help organizing the licensing process, review 1 Exam Prep application services.

High-Voltage HVAC/R and Trainee Supervision

06A itself is not limited by voltage, but Washington places an important supervision rule on trainees.

An unsupervised electrical trainee cannot install, repair, replace, or maintain any part of an HVAC/refrigeration system containing a circuit rated over 600 volts, whether that circuit is energized or deenergized.

For the examination, this connects scope knowledge with electrical safety and certification rules. The equipment may fit 06A while the trainee's supervision situation still makes the described work improper.

The Current 06A Electrician Exam at a Glance

Current 06A Electrician Exam Blueprint

The number of questions in each category is approximate, but the blueprint shows something useful: 06A is a broad technical exam. Several categories carry four questions each instead of one giant topic doing all the heavy lifting.

Motors and HVAC Equipment Matter

NEC 430 through 450 contributes approximately four questions to the electrician technical section.

Review:

• Motor full-load current.
• Branch-circuit conductor sizing.
• Motor-compressor circuits.
• Short-circuit and ground-fault protection.
• Motor overload protection.
• Controllers.
• Disconnecting means.
• Transformers.
• Motor tables.
• Equipment nameplates.

HVAC/R electricians live in a world full of motors and compressors. Article 430 should become familiar enough that opening it does not feel like visiting a new country every time.

Overcurrent Protection Is About Four Questions

NEC 240 contributes approximately four questions.

Review:

• Conductor overcurrent protection.
• Standard overcurrent device ratings.
• Branch-circuit protection.
• Equipment protection.
• Motor and HVAC-specific protection rules.

Pay attention to whether a question is asking about conductor protection, motor overload protection, or short-circuit and ground-fault protection. Those terms can sound like cousins, but they do different jobs.

Grounding and Bonding Is About Four Questions

NEC 250 also contributes approximately four questions.

Study equipment grounding conductors, bonding, fault-current paths, grounding electrodes where applicable, and grounding and bonding around mechanical equipment.

Do not memorize grounding terms as isolated definitions. Picture the actual HVAC/R installation and ask where fault current needs to travel if something goes wrong.

Wiring Methods Are About Four Questions

NEC 300 through 398 contributes approximately four questions.

HVAC/R equipment appears in mechanical rooms, rooftops, outdoor locations, refrigeration spaces, damp locations, and plenty of other places where wiring methods matter.

• Conductor installation.
• Raceways and cable methods.
• Boxes and fittings.
• Wet and damp locations.
• Protection from physical damage.
• Supports and securing.
• Outdoor wiring.
• Equipment connections.

Electrical Equipment Is About Four Questions

NEC 400-427 and 455-480 contribute approximately four questions.

This area can involve flexible cords and cables, appliances, electric heating equipment, generators, storage batteries, and other equipment categories included in the examination outline.

Connect these subjects to real HVAC/R work instead of studying article numbers like a phone book with unusually strict consequences.

General Trade Knowledge and Theory Is About Four Questions

Basic electrical theory is another important part of the examination.

• Voltage.
• Current.
• Resistance.
• Power.
• Ohm's law.
• Series and parallel circuits.
• Basic AC theory.
• Electrical measurements.
• Troubleshooting.
• Trade math.

Being able to solve basic theory questions without searching a reference can save valuable time for harder code lookups.

Equipment Over 600 Volts Appears on the Exam

The current 06A electrician outline includes approximately one question from NEC Article 490.

This is another reminder that 06A is not limited to low-voltage or ordinary 120/240-volt equipment.

Understand the general safety and installation concepts related to equipment over 600 volts and remember the Washington supervision restrictions that apply to trainees around these systems.

Hazardous Locations and Specialty Scope

The current technical outline includes approximately one hazardous-location question.

Washington's 06A scope specifically limits electrical wiring governed by certain NEC hazardous-location articles when that wiring is located outside HVAC/refrigeration equipment.

That makes hazardous-location questions especially interesting because both the NEC requirement and the licensing scope may matter.

The Washington Codes Section Has 17 Questions

Do not let the technical section steal all your attention. Washington Laws & Rules contributes approximately 17 questions and gives you one hour.

Study:

• Chapter 19.28 RCW.
• Chapter 296-46B WAC.
• WAC 296-46B-920 specialty scope.
• WAC 296-46B-945 experience qualification.
• Electrician certification.
• Trainee supervision.
• Permits.
• Inspections.
• Electrical contractor requirements.
• Certificate renewal.
• Continuing education.

State-law questions can become some of the quickest points on the exam when you already know where the information lives.

The Current 06A Electrician Exam Is Open Book

The current PSI bulletin identifies Washington electrical examinations as open book.

The current core references include:

• 2020 National Electrical Code.
• Current Chapter 19.28 RCW.
• Current Chapter 296-46B WAC.

Original copyrighted references may contain highlighting, underlining, and permanent index tabs prepared before entering the exam area.

Removable notes, sticky notes, and repositionable tabs are prohibited. References may not be written in during testing.

Printed Washington RCW and WAC materials are accepted when prepared according to PSI's current binder requirements. A silent, nonprinting, nonprogrammable calculator is also allowed under the current rules.

Current Exam NEC vs. Washington Field NEC

The current PSI licensing-exam bulletin still identifies the 2020 National Electrical Code.

Washington field installations currently use the 2023 NEC with state amendments.

Washington has adopted the 2026 NEC with a delayed effective date of December 31, 2026, when it is scheduled to replace the 2023 NEC for field installations.

Open-Book Strategy for the 06A Exam

1. Learn the scope first. Know what work inside and outside HVAC/R equipment belongs to 06A.
2. Memorize the six-foot whip rule.
3. Know the difference between 06A and 06B.
4. Practice Articles 240, 250, 300, and 430.
5. Review electrical equipment articles in the published blueprint.
6. Review Article 490.
7. Practice electrical theory without relying on a book.
8. Study WAC 296-46B-920 and 296-46B-945.
9. Practice Washington RCW/WAC lookups.
10. Take 34-question technical practice sections in two hours.
11. Take 17-question Washington Codes practice sections in one hour.

Apply Through Labor & Industries Before PSI

06A electrician candidates must first qualify through Washington Labor & Industries.

L&I reviews the candidate's work experience and education requirements. Once the application is approved, the state sends an exam eligibility notice with instructions and the identification needed to schedule with PSI.

The current PSI rules give approved candidates one year from the approval date to pass all required exam sections.

If you fail an examination attempt, the current rules require a 14-day wait before retesting. After a third failed attempt, the waiting period increases to three months from the most recent failure for future attempts.

Current Exam and Certification Fees

Fees can change. Verify the live PSI and Washington amounts when you are ready to apply, test, or renew.

For application help, review 1 Exam Prep application services. For exam books, licensing expenses, and related costs, review 1 Exam Prep financing options.

Renewal and Continuing Education

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

A normal three-year renewal currently requires 24 hours of approved continuing education.

• At least 8 hours must cover changes in the currently adopted NEC.
• At least 4 hours must cover Chapter 19.28 RCW and/or related WAC requirements.
• The remaining 12 hours may be other approved continuing education.

If an electrician certificate remains expired for more than 90 days, it generally cannot simply be renewed. Retesting becomes the path back to certification.

A Practical 06A HVAC/R Study Plan

1. Start with WAC 296-46B-920. Learn exactly what 06A can and cannot do.
2. Know the six-foot whip rule and external-disconnect limits.
3. Learn how 06A differs from 06B.
4. Study NEC 430-450 motors and HVAC equipment.
5. Study NEC 240 overcurrent protection.
6. Study NEC 250 grounding and bonding.
7. Study NEC 300-398 wiring methods.
8. Review electrical equipment articles and Article 490.
9. Practice electrical theory and trade math.
10. Study Washington certification, supervision, permit, and inspection rules.
11. Practice code navigation with a timer.
12. Take full 34-question technical and 17-question Washington practice sections.

Use the Washington A-HVAC/R Electrician collection to organize your specialty-focused preparation.

For core Washington electrical references, review the Washington General Electrician Book Package.

Study Like a 06A Electrician

A good way to prepare is to picture an actual HVAC/R service call.

Start with the equipment. Is the work part of a heating, ventilation, air-conditioning, or refrigeration system? Is the component inside the equipment or external to it? Is it low-voltage control wiring, a line-voltage internal component, a flexible supply whip, or general premises wiring?

Then check the electrical rules. What conductor rules apply? What overcurrent protection is required? What motor rules control the installation? What grounding and bonding are needed? Is the wiring method correct for the location?

Finally, check the specialty boundary. Is 06A legally allowed to perform this part of the job? If the project has grown into general branch circuits, feeders, services, external panelboards, general building lighting, or unrelated building-control systems, the answer may be no.

That habit turns exam preparation into the same decision-making process you will use in the field.

Frequently Asked Questions

Conclusion

The Washington 06A HVAC/Refrigeration Electrician certificate is a broad specialty for electricians whose work centers on heating, ventilation, air-conditioning, and refrigeration systems. Unlike the restricted 06B specialty, 06A is not generally limited by voltage, phase, or amperage. That allows 06A electricians to work on a wider range of HVAC/R equipment, but the work must still remain inside the specialty boundaries established by Washington.

Those boundaries are worth learning early. The specialty covers qualifying HVAC/R low-voltage controls, telecommunications circuits, line-voltage components within HVAC/R equipment, certain internal disconnect and controller components, short protective raceway sections, qualifying flexible supply whips, and specific bonding work.

At the same time, 06A generally does not provide broad authority to install general building services, feeders, branch circuits, raceway systems, panelboards, switchboards, motor control centers, or unrelated building-control systems. General building lighting is also outside the ordinary specialty simply because it happens to be near HVAC equipment.

The experience requirement is straightforward. Washington currently requires 4,000 qualifying work hours for both examination eligibility and full 06A certification. A 4,000-hour specialty also requires 48 hours of approved basic trainee classroom instruction.

For people who begin in Restricted HVAC/R 06B, Washington provides a useful bridge. The 2,000 hours required for full 06B certification can count as 2,000 hours toward the 4,000 hours needed for 06A. That credit does not turn the 06B experience into general journey-level experience.

The current 06A electrician examination has two sections. NEC and Theory contains approximately 34 scored questions and allows two hours. Washington Codes contains approximately 17 scored questions and allows one hour. That creates a published total of 51 scored questions over three section-hours.

The technical blueprint is broad. Overcurrent Protection, Grounding and Bonding, Wiring Methods, Electrical Equipment, Motors/HVAC/Generators/Transformers, and General Trade Knowledge and Theory each contribute approximately four questions. The exam also includes general requirements, wiring and protection, equipment above 600 volts, hazardous locations, special equipment, and special conditions.

The Washington Codes section is just as important. Learn 06A scope, experience qualification, certification requirements, trainee supervision, permits, inspections, contractor responsibilities, renewal, and continuing education.

The current PSI bulletin identifies the exam as open book and currently bases code questions on the 2020 National Electrical Code together with current Chapter 19.28 RCW and Chapter 296-46B WAC. Permanent tabs, highlighting, and underlining are permitted under current rules, while removable notes and repositionable tabs are prohibited.

Washington field installations currently use the 2023 NEC. The state has adopted the 2026 NEC with a delayed effective date of December 31, 2026. That makes it especially important to distinguish the exam-reference edition from the code currently enforced on job sites.

The application process starts with Labor & Industries. L&I reviews the candidate's experience and education before approving the person to schedule with PSI. Once approved, the candidate currently has one year to pass all required sections.

Current PSI rules require a 14-day waiting period after a failed attempt. After the third failed attempt, future attempts require a three-month waiting period from the most recent failure.

The current PSI fee for the three-hour 06A examination is $65. Washington currently charges $114.60 for the specialty electrician application including the original certificate and processing fee. Current renewal is $92.60 online or $106.40 by mail, fax, or in person.

Once certified, a specialty electrician normally renews every three years. A normal renewal period requires 24 hours of approved continuing education, including at least eight hours of NEC code update and four hours of Washington RCW/WAC education.

The best exam preparation connects the specialty scope to actual HVAC/R electrical work. Look at a system and ask where the HVAC equipment begins and ends. Identify whether the electrical component is inside or outside the equipment. Decide whether the work falls within 06A. Then apply the NEC rules for motors, wiring methods, overcurrent protection, grounding, bonding, and equipment.

That approach is more useful than trying to memorize hundreds of isolated rules because it trains you to think through the same questions you will face in the field.

Key Takeaways

• Washington 06A HVAC/R is a 4,000-hour specialty, requiring 4,000 qualifying hours for examination eligibility and certification.
• 06A is not generally limited by voltage, phase, or amperage, but the work must remain inside the HVAC/refrigeration specialty scope.
• The current 06A electrician exam contains approximately 34 NEC/Theory questions in two hours plus 17 Washington Codes questions in one hour.
• The current exam is open book, requires 70 percent to pass, and currently uses the 2020 NEC plus current RCW 19.28 and WAC 296-46B.
• Focus on 06A scope, motors, overcurrent protection, grounding and bonding, wiring methods, electrical equipment, theory, and Washington licensing rules.

Plain-Language Summary

Washington's 06A HVAC/Refrigeration Electrician certificate is for electricians who perform qualifying electrical work on heating, ventilation, air-conditioning, and refrigeration systems.

The 06A specialty is broader than Restricted HVAC/R 06B. Washington does not generally limit 06A by voltage, phase, or amperage. That does not mean a 06A electrician can perform every type of electrical work. The job still has to fall inside the HVAC/R specialty.

06A can perform qualifying low-voltage HVAC/R control work, work on line-voltage components inside HVAC/R equipment, certain internal disconnect and controller work, short protective raceway sections, flexible supply whips up to six feet long, and other specifically allowed HVAC/R electrical work.

The specialty generally does not include broad installation of building services, feeders, general branch circuits, raceway systems, external panelboards, switchboards, motor control centers, general building lighting, or unrelated building-control systems.

Washington currently requires 4,000 qualifying work-experience hours before taking the 06A examination. Full certification also requires 4,000 hours. Candidates in this 4,000-hour specialty must complete the required 48 hours of basic trainee classroom instruction.

If you already hold or are working through the 06B Restricted HVAC/R path, Washington allows the 2,000 hours required for 06B certification to count as 2,000 hours toward the 4,000 required for 06A.

The current 06A electrician exam has approximately 34 NEC and Theory questions. You receive two hours for that section. The Washington Codes section has approximately 17 questions and allows one hour. That is 51 published scored questions across three section-hours.

The current technical exam gives about four questions each to Overcurrent Protection, Grounding and Bonding, Wiring Methods, Electrical Equipment, Motors/HVAC/Generators/Transformers, and General Trade Knowledge and Theory.

The exam also covers general requirements, wiring and protection, equipment above 600 volts, hazardous locations, special equipment, and special conditions.

The Washington Codes section tests state law and administrative rules. Candidates should understand specialty scope, experience requirements, trainee supervision, certification, electrical contractors, permits, inspections, renewal, and continuing education.

The current examination is open book. PSI currently identifies the 2020 National Electrical Code, current Chapter 19.28 RCW, and current Chapter 296-46B WAC as the main code and law references.

The current passing score is 70 percent. Candidates first apply through Washington Labor & Industries. After L&I approves the candidate, the exam is scheduled through PSI.

Current PSI pricing lists $65 for a three-hour exam. Washington currently lists $114.60 for the specialty electrician application and original certificate. Current certificate renewal is $92.60 online or $106.40 by mail, fax, or in person.

The 06A electrician certificate normally renews every three years. A normal three-year renewal currently requires 24 hours of approved continuing education, including eight hours of code update and four hours of Washington RCW/WAC education.

Good preparation starts with understanding the 06A scope. Then study motors, overcurrent protection, grounding and bonding, wiring methods, electrical equipment, theory, and Washington law. Practice finding answers quickly in your approved references so the open-book exam works in your favor instead of becoming a three-hour page-turning contest.

Use the Washington A-HVAC/R Electrician collection from 1 Exam Prep to organize your preparation around the current specialty and exam.