Washington’s 06A certificate — formally the HVAC/refrigeration system certificate (06A) — is a specialty electrician certificate of competency issued by the Washington Department of Labor and Industries (L&I) under RCW 19.28 and WAC 296-46B, examined by PSI in an NEC & Theory section and a Washington Code section that must each be passed. The PassProfessor Washington 06A HVAC/R Specialty program prepares candidates for that examination and the Washington rules layered on it. This guide is the companion to the Washington 06A HVAC/R Specialty program page.
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The credential at a glance
| Item | Verified position |
|---|---|
| Program | Washington 06A HVAC/R Specialty: the HVAC/refrigeration system certificate (06A) |
| Regulator | Washington Department of Labor and Industries (L&I), Electrical Program, under RCW 19.28 and WAC 296-46B |
| Examination vendor | PSI Services LLC, under contract to L&I; L&I approval and an Exam Unique ID required before scheduling |
| Examination structure | NEC & Theory — 50 questions, 3 hours; Washington Code (RCW & WAC) — 20 questions, 1 hour; 70 questions, 4 hours, plus 10 unscored experimental questions |
| Passing standard | Each section independently — verbatim forms in the section below |
| Book policy | Open book, under the bulletin’s material rules |
| Tested code layer | 2020 National Electrical Code, plus the current RCW 19.28 and WAC 296-46B |
| Adopted field layers | 2023 National Electrical Code; field mechanical code: 2021 International Mechanical Code with Washington amendments — neither is the tested layer |
| Experience gate | 4,000 hours, for both examination eligibility and certification; 48 hours of basic classroom instruction |
| Credential term | Three-year renewal cycle; 24 hours of continuing education per cycle (8 / 4 / 12) |
| Administrator note | PassProfessor is independent and is not affiliated with the Washington Department of Labor and Industries |
This guide is organised the way the credential itself is organised: a full specialty inside an electrical licensing family, examined by a two-section open-book paper, gated by a single 4,000-hour figure, and bounded by a scope rule whose central sentence removes any voltage, phase or amperage ceiling inside the specialty. Each structural fact gets a full treatment below, because each decides a different part of preparation.
First, the structure: an electrical certificate, not a contractor license
Washington certifies the electrical side of heating, ventilation, air conditioning and refrigeration work through its electrician framework. The statute is RCW 19.28, Electricians. The rule is WAC 296-46B: section 920 lists the certificate types and their scopes, section 945 governs qualifying for examinations, section 960 governs examinations, section 909 sets fees, and section 970 frames continuing and classroom education. The 06A lives entirely inside that architecture.
No Washington HVAC contractor license appears in that architecture, and no mechanical license of that kind appears there either. The verified negative prints as structure throughout this guide: there is no separate HVAC contractor examination to take instead, and passing the 06A examination does not make its holder a contractor. What the examination certifies is an individual specialty electrician — one of fourteen specialty categories L&I lists — whose electrical work is performed in HVAC and refrigeration systems.
Above the specialties sits the general journey level (01) certificate, covering unrestricted electrical work; below them, the trainee certificate is the entry instrument. The sibling 06B restricted specialty shares the framework but carries its own smaller NEC & Theory section, its own hours structure and a hard power-connection ceiling. The two certificates are never interchangeable.
The passing standard, verbatim
Washington publishes the standard twice, and the guide states it only in the published forms.
The PSI bulletin, in its Score Reporting section, states: “You must score 70% to pass.”
The L&I Electrical Examination page states: “You must pass each section of the examination with a score of 70% or greater.”
The second form governs how a candidate should understand the first. The examination has two sections, and each must independently reach the standard. There is no combined score across the 70 questions and no averaging between sections. A candidate who performs strongly on NEC & Theory and falls short on Washington Code has not passed; a candidate in the reverse position is in exactly the same place. Preparation time, practice scoring and readiness judgements must therefore be tracked per section, never as a single percentage across both papers. Any readiness measure that blends the two sections into one number is measuring something Washington does not use to decide the result.
The examination in full
Approval before scheduling
The route to the chair runs through L&I first. Candidates must be approved by L&I, which sends an eligibility notice carrying an Exam Unique ID used to register with PSI. The bulletin lists Washington testing centres, with other locations across the United States. The examination is computer-administered, and the score appears on screen immediately.
Section one: NEC & Theory — 50 questions, 3 hours
The first section examines the National Electrical Code in its tested 2020 edition together with general electrical theory. The bulletin outline for 06A-HVAC/R, Electrician column, distributes the 50 questions across knowledge areas and notes that the number in any individual area is approximate. The largest areas are General Trade Knowledge & Theory, at 10 questions, and the area spanning NEC Articles 430 through 450 — motors, HVAC, generators and transformers — at 8. Wiring methods under NEC Articles 300 through 398 carries 6, and the NEC 240 and NEC 250 areas carry 5 each. The remaining areas complete the 50.
Two features shape study. First, the section’s centre of gravity is exactly where the specialty lives: motor and HVAC equipment articles, wiring methods, overcurrent protection and grounding, on a broad base of general trade knowledge and theory. Second, the theory component is genuinely general: the bulletin states that theory questions are drawn from general copyrighted electrical publications and may include general mathematics and theory computation. A candidate whose preparation is only a code-location drill is underprepared for those items. The same outline table prints Administrator and Master Electrician columns with different counts; those belong to different certificates. Only the Electrician column describes this program.
Section two: Washington Code — 20 questions, 1 hour
The second section examines Chapter 19.28 RCW and Chapter 296-46B WAC in their current versions — the law of the certificate itself: who must hold one, what each specialty may and may not do, how trainees are supervised, what education qualifies a candidate, and how examinations, fees and renewal are handled. Twenty questions in one hour is the fastest pace in the sitting, in material where the correct answer often turns on a precise rule boundary. Candidates misjudge this section as a short administrative appendix; the per-section pass rule gives it full veto power over the result. It deserves preparation in proportion to its power, not its size.
Experimental questions
In addition to the scored questions, 10 experimental questions may be administered. The bulletin states their terms exactly: these questions will not be scored, and the time taken to answer them will not count against examination time. They carry no identifying marker. The practical instruction is simple — answer every question as though it counts, at the same care level, because the scored result assumes full effort throughout.
Open book, precisely
All examinations in this program are open book. The bulletin states: “All examinations are open book.” It permits any original copyrighted material, together with a silent, nonprinting, nonprogrammable calculator. L&I’s bring-list specifies the National Electrical Code book in the 2020 edition and printed copies of Chapter 19.28 RCW and Chapter 296-46B WAC, hole-punched in a three-ring binder, alongside any original copyrighted material — examples include Ugly’s, Ferm’s Fast Finder and Soares Grounding.
The conditions are part of the policy. Permanent index tabs, highlighting and underlining are allowed; handwritten notes and removable or sticky tabs are not. Materials with unacceptable notations are not allowed into the examination and may be confiscated. Open book therefore rewards a particular preparation: a permanently tabbed code book navigated hundreds of times, a binder of the statute and rule organised for fast retrieval, and no reliance on annotations that will not survive the door check. Practise with the exact materials you will carry in.
Results, the one-year window and retakes
The score appears on screen immediately. Behind that instant result sits a one-year structure: a candidate has one year from the approval letter date to pass all sections, passed sections carry only within that period, and the first attempt must consist of all sections. At least 14 days must pass between attempts; after failing any section three times within a year, 90 days must pass between further attempts. Results may be challenged in writing to the Chief Electrical Inspector within 20 days, under WAC 296-46B-960. No component beyond the two sections is stated for the examination.
Three code layers, never merged
No discipline in this program matters more than keeping the code layers separate, because Washington’s layers genuinely diverge.
The tested layer is the 2020 National Electrical Code, plus the current RCW 19.28 and WAC 296-46B. The bulletin states the basis in one sentence: all law, rule and code questions are based on the current version of the Revised Code of Washington (RCW) 19.28 and Washington Administrative Code (WAC) 296-46B, and the 2020 National Electrical Code. Every examination answer is keyed to that layer.
The adopted electrical layer is different. WAC 296-46B-010 adopts the 2023 edition of the National Electrical Code, effective April 1, 2024, and already provides that, effective December 31, 2026, the 2026 edition is adopted and replaces the 2023 edition. Field installations are inspected against the 2023 edition now, and against the 2026 edition from the end of 2026 — while the examination tests the 2020 edition. Stating that the examination tests the 2023 or 2026 NEC would be wrong; stating that field work follows the 2020 NEC would be equally wrong.
The field mechanical layer is different again: Chapter 51-52 WAC adopts the 2021 International Mechanical Code with Washington amendments, effective statewide March 15, 2024, governing the mechanical side of the systems an 06A holder wires and services. It is not an examination reference and is presented here only as field context.
The renewal framework repeats the discipline after certification: code-update hours follow the currently adopted code, not the tested one. The candidates who handle the sitting best can say, for any given rule, which layer they are standing in.
Eligibility: the 4,000 hours, read closely
WAC 296-46B-945 sets the qualifying conditions, and Table 945-1 gives the 06A row its shape: 4,000 hours required to be eligible for examination, and 4,000 hours required for certification. Unlike its restricted sibling, the 06A offers no earlier examination point — the full experience figure stands in front of the sitting, not behind it.
The hours have conditions around them. The applicant must hold a current electrical training certificate; the work must have been performed for an employer employing an appropriate certified electrician; and the 4,000 hours must be experience under the direct supervision of an appropriate electrician in the specialty. This specialty is not eligible for unsupervised-trainee status. No more than 50 percent of the minimum experience may come from a training school program, and all applicants must be at least 16.
Classroom instruction is the second gate: 48 hours of basic classroom instruction, the figure the rule sets where 4,000 or more but less than 6,000 hours of experience is required — and L&I states that trainees in 4,000-hour specialties must complete it before they can renew or qualify for examination. During training, supervision must be by a specialty electrician certified for the kind of work being done, or by a journey level electrician, a minimum of 75 percent of the time. The rule also recognises completion of an appropriate two-year registered apprenticeship program as an alternative route.
The route in order runs: hold the training certificate and work under the required supervision while accumulating the specialty and classroom hours; obtain L&I approval and the Exam Unique ID; register with PSI; sit both sections; reach the verbatim standard in each; and receive the certificate. Hours earned under the restricted 06B have a defined place in this route — the rule credits the 2,000 hours required for 06B certification toward the 4,000 required here, while barring that credit toward qualification for the general journey level (01) examination. Count that credit exactly as the rule states it: toward this specialty, and not beyond it.
Scope in full: the unlimited sentence and the fence around it
The scope rule, WAC 296-46B-920(2)(f), opens with the sentence that defines the full specialty: “(A) The (06A) specialty is not limited by voltage, phase, or amperage.” Inside HVAC and refrigeration work, no ceiling of that kind applies. That is the whole difference in kind between the 06A and its restricted sibling, whose ceiling the rule states numerically.
Within that breadth, the rule lists what the specialty may install, repair, replace and maintain. Class 2 low-voltage control circuit wiring and components may be installed in all residential occupancies, and in other occupancies under the story and previously-wired conditions the rule states at its subsections (VI) and (VII). Line voltage components within HVAC and refrigeration equipment are within scope, including product-illumination luminaires inside refrigeration cases and factory-authorised accessories. Internal components of the equipment disconnecting means or controller are within scope, provided they are not located in a motor control centre or panelboard. Short sections of raceway for the physical protection of low-voltage cables, line-voltage flexible supply whips not over six feet, and the gas-piping bonding item named in the rule complete the principal list. A general condition runs underneath: component replacements must be like-in-kind or the manufacturer’s authorised replacement.
The prohibitions are drawn with the same precision, and examination questions test them as boundaries. The specialty may not install line voltage controllers or disconnect switches external to the equipment, subject to one narrow exception: a like-in-kind surface-mounted disconnect enclosure rated not more than 20 amperes and 120 volts, with up to ten feet of protective raceway, not terminating in a panelboard. It may not install integrated building control systems other than HVAC and refrigeration systems; stand-alone line voltage equipment — heat cable, wall and baseboard heaters, contactors and motor starters are the rule’s examples — unless exclusively controlled by and integrally connected to the system; building-lighting luminaires; raceway or conduit systems; panelboards, switchboards or motor control centres external to the system; or line voltage service, feeder or branch circuit conductors, apart from a narrow supplementary-device exception where the devices are within sight of each other. It may not perform wiring in NEC Articles 500 through 516 classified locations outside the equipment. One further fence sits inside the scope: no unsupervised trainee may work on any part of a system containing any circuit rated over 600 volts.
Read as a whole, the rule draws the specialty around the equipment: deep authority inside the systems and their controls, at any voltage, phase or amperage the equipment presents — and a firm stop at the building systems and distribution equipment that belong to broader certificates. Candidates should be able to place any described task on the correct side of that line, because the Washington Code section examines exactly that placement.
Fees, by instrument
Two payees, two stages, no combined figure.
PSI — the examination instrument. PSI charges per hour for most examinations, on the published scale: one hour $45.00, two hours $55.00, three hours $65.00, four hours $75.00, five hours $85.00, six hours $95.00, seven hours $105.00. The 06A examination totals four hours, so its fee is the $75.00 row. Registration fees are not refundable or transferable, examination fees are valid for one year, and retests are billed per hour for the sections retaken. L&I confirms the architecture: the fees paid to PSI are in addition to any application fees paid to L&I.
L&I — the state instrument. Under WAC 296-46B-909, in its current text effective July 1, 2026, the journey level, specialty or reciprocal electrician application — including the original certificate and processing — is $114.60, with $44.20 nonrefundable after submission. Renewal is $106.40 in person, by mail or by fax, or $92.60 fully online; late renewal is $212.90 or $185.30 on the same split. The fee rule’s department-administered examination fee applies to examinations the department itself administers; PSI administers this one, so that figure is not this program’s fee.
Renewal and continuing education
The certificate runs on a three-year renewal cycle. Across the three years between renewals, the holder completes 24 hours of continuing education, divided by subject: 8 hours on currently adopted National Electrical Code changes; 4 hours on Chapter 19.28 RCW and related Chapter 296-46B WAC; and the remaining 12 hours in any other approved course. The same class may not be taken twice for credit.
The division teaches the program’s central lesson one more time: the 8 code-update hours follow the currently adopted NEC, not the 2020 edition the examination tests. Washington’s framework assumes both literacies at once, from the first application through every renewal.
A study plan built on the two-section structure
First, qualify honestly. Confirm the route facts: training certificate current, specialty hours documented toward the full 4,000, the 48 classroom hours completed or scheduled to land before qualification, and supervision conditions met. The 06A has no early sitting point, so the calendar is built backward from the completed gate.
Second, build the NEC & Theory base at its published weight. General trade knowledge, theory and computation come first — the largest single area, and the base for everything else; then the motors, HVAC, generators and transformers area; then wiring methods, overcurrent protection and grounding. Practise with the permanently tabbed 2020 code book that will enter the room, and time the searches: open book converts knowledge into retrieval speed.
Third, study the Washington Code as a working text. Read RCW 19.28 and WAC 296-46B for the certificate’s own machinery: types and scopes, the 06A permissions and prohibitions read as boundary cases, supervision, qualifying hours, examination procedure, fees and renewal education. Drill the scope fence as sorting exercises — described task, correct side of the line, governing condition.
Fourth, keep the layers visibly separate. Maintain two short lists: what the tested layer says (NEC 2020) and what the adopted layer says (NEC 2023, with NEC 2026 effective December 31, 2026), with the field mechanical code noted as field context only. Any study note that cannot say which layer it belongs to is unfinished.
Fifth, rehearse the sitting as Washington scores it. Timed practice scored per section, against the verbatim standard in each separately; full-length runs in the real proportions — 50 questions in 3 hours, then 20 in 1 hour — answering everything at full care. Readiness is two verdicts, not one.
The errors this examination is built to catch
Blending the sections. Averaging a strong section against a weak one is the most consequential misreading available; each section must reach its standard alone. Studying the adopted code for the sitting. The examination tests NEC 2020; field currency in NEC 2023 does not substitute. Treating the mechanical code as examination material. The 2021 International Mechanical Code layer is field context, not a reference the sections test. Borrowing the wrong outline column. The Administrator and Master Electrician columns describe other certificates; their counts are not this examination. Merging the fees. PSI’s $75.00 fee and L&I’s $114.60 fee are separate instruments at separate stages; any combined figure is an invention. Misplacing the credential. Presenting the 06A as a contractor or mechanical license repeats the structural error the framework is built to prevent. Underpreparing the small section. Twenty questions with full veto power deserve more than the final evening.
Washington 06A in one view
The 06A is Washington’s full electrical specialty for HVAC and refrigeration work: a certificate inside the electrician family, unlimited by voltage, phase or amperage within its specialty, fenced precisely at the building systems and distribution equipment beyond the equipment it serves. It is gated by 4,000 supervised specialty hours and 48 classroom hours, examined by PSI in 50 NEC & Theory questions and 20 Washington Code questions that must each reach the published standard, priced through two separate instruments that must never be added together, and renewed every three years on 24 hours of education keyed partly to a code edition newer than the one it was examined on. Hold those structures apart — certificate from contractor, section from section, tested edition from adopted edition, vendor fee from state fee — and the examination becomes what it is designed to be. The companion Washington 06A HVAC/R Specialty program page carries the program overview.
Frequently asked questions
What exactly is the Washington 06A?
The HVAC/refrigeration system certificate (06A): a specialty electrician certificate issued by L&I under RCW 19.28 and WAC 296-46B — an electrical certificate for HVAC and refrigeration work, not an HVAC contractor or mechanical license, neither of which exists in this framework.
What are the two examination sections?
NEC & Theory — 50 questions, 3 hours — and Washington Code (RCW & WAC) — 20 questions, 1 hour: 70 questions and 4 hours in total, with 10 experimental questions possibly added unscored.
What score passes, exactly?
In the bulletin’s words: “You must score 70% to pass.” In L&I’s words: “You must pass each section of the examination with a score of 70% or greater.” Each section must reach the standard on its own.
Which code editions does the examination use?
The 2020 National Electrical Code and the current RCW 19.28 and WAC 296-46B. Washington’s adopted field edition is the 2023 NEC, with the 2026 edition adopted effective December 31, 2026 — separate layers from the tested edition.
Is the International Mechanical Code on this examination?
No. The 2021 International Mechanical Code with Washington amendments, effective March 15, 2024, is Washington’s field mechanical code layer. This is an NEC examination; the mechanical code is field context only.
How many hours stand in front of the 06A examination?
4,000 hours of specialty work experience under the direct supervision of an appropriate electrician — the same figure for examination eligibility and for certification — plus 48 hours of basic classroom instruction.
Can 06B hours count toward the 06A?
Yes, in the rule’s stated measure: the 2,000 hours required for 06B certification may be credited as 2,000 hours toward the 4,000 hours required for 06A certification. They cannot be credited toward qualification for the general journey level (01) examination.
What are the fees?
PSI charges $75.00 for the four-hour examination. L&I’s application, including the original certificate and processing, is $114.60, with $44.20 nonrefundable after submission. Renewal is $106.40 on paper or $92.60 fully online; late renewal is $212.90 or $185.30. The two instruments are separate.
What happens after a failed section?
At least 14 days pass between attempts; after failing any section three times within a year, 90 days must pass between further attempts. Passed sections carry only within the one-year period from the approval letter date. Results may be challenged in writing to the Chief Electrical Inspector within 20 days.
What continuing education does renewal require?
24 hours in each three-year cycle: 8 hours on currently adopted NEC changes, 4 hours on RCW 19.28 and WAC 296-46B, and 12 hours of other approved coursework. The same class may not be taken twice for credit.
When does enrollment open for the PassProfessor program?
The program is in the works; enrollment is not yet open. PassProfessor is an independent preparation provider, not affiliated with L&I or PSI. Leave an email address and PassProfessor will write when the program is ready — only about this program.