Arizona Plumbing, Including Solar Commercial Contractor (C-77) Exam - Online Practice Questions

Prepare for the Arizona Plumbing, Including Solar Commercial Contractor (C-77) exam with online practice questions designed to support focused, trade-specific exam preparation. This product includes 3 months of access, giving you a flexible way to review commercial plumbing systems, solar plumbing concepts, drainage, waste and vents, indirect waste, water supply, backflow prevention, storm drainage, fixtures, fuel gas, septic and sewer, hydronics, fire sprinklers, excavation, isometric analysis, plumbing math, pipe trades information, boiler concepts, underground utility awareness, wastewater rules, and jobsite safety.

The Arizona C-77 Plumbing, Including Solar Commercial Contractor exam is part of the Arizona contractor licensing process for commercial plumbing contractors whose scope includes solar. Candidates preparing for this classification should be ready to study both the main plumbing trade exam and the required solar portion. This means preparation should include standard commercial plumbing topics as well as solar water heating and pool heating concepts such as collectors, controls, piping materials, system design, pumps, storage systems, open-loop systems, and closed-loop systems.

This online practice question product helps turn study time into active review. Plumbing and solar exams require more than simply reading through code books. Candidates need to understand how systems work, how code sections are organized, how tables are used, how piping and fixture requirements are applied, and how contractor-style questions are worded. Practice questions help identify weak areas, improve topic recognition, and build confidence before test day.

The Arizona Plumbing, Including Solar Commercial Contractor (C-77) Exam - Online Practice Questions product is designed for self-paced preparation. With 3 months of access, you can study in organized sessions, revisit missed questions, return to difficult topics, and continue improving your readiness over time. This product can be used with approved exam-room references, study-only references, highlighted materials, tabbed books, classroom instruction, or an independent study plan.

Commercial plumbing including solar is a broad classification. Candidates should prepare for plumbing code questions, fuel gas requirements, mechanical code topics, sprinkler system fundamentals, hydronic heating, wastewater treatment provisions, excavation and utility awareness, solar water heating, and general industry practices. A strong preparation plan should cover the full exam outline instead of focusing only on the areas most familiar from field experience.

What You Get

• Online Practice Questions: Trade-focused questions designed to support preparation for the Arizona Plumbing, Including Solar Commercial Contractor (C-77) exam.
• 3 Months of Access: Study online with 3 months of access so you can review, repeat, and strengthen your exam preparation over time.
• Commercial Plumbing Review: Practice content supports review of drainage, waste and vents, water supply, backflow prevention, fixtures, fuel gas, hydronics, fire sprinklers, septic and sewer, excavation, and isometric analysis.
• Solar Plumbing Review: Practice supports review of solar water and pool heating concepts, collectors, controls, piping, open and closed loop systems, system design, pumps, and storage systems.
• Reference-Based Study Support: Questions help reinforce the plumbing, fuel gas, mechanical, sprinkler, wastewater, safety, pipe trades, hydronic heating, boiler, utility, and solar references used for preparation.
• Self-Paced Preparation: Work through questions on your own schedule and return to subjects that need additional review.

Exam Details

The Arizona C-77 Plumbing, Including Solar Commercial Contractor classification includes the C-77 plumbing trade examination and an additional C-77 solar examination. The C-77 plumbing exam includes 100 questions, allows 240 minutes, and requires a minimum passing score of 70%. The C-77 solar exam includes 30 questions, allows 75 minutes, and requires a minimum passing score of 70%.

The C-77 plumbing exam content outline includes drainage waste and vents, indirect waste, water supply systems, backflow prevention, roof drains and storm drainage systems, plumbing fixtures including water heaters and accessibility, general knowledge and general regulations, specialty plumbing, interceptors and traps, isometric analysis, fuel gas, septic and sewer, hydronics, fire sprinklers, and excavation.

The C-77 plumbing exam subject areas include drainage waste and vents with 15 items, indirect waste with 4 items, water supply systems with 12 items, backflow prevention with 5 items, roof drains and storm drainage systems with 5 items, plumbing fixtures including water heaters and accessibility with 6 items, general knowledge and general regulations with 8 items, specialty plumbing, interceptors, and traps with 5 items, isometric analysis with 5 items, fuel gas with 10 items, septic and sewer with 10 items, hydronics with 5 items, fire sprinklers with 5 items, and excavation with 5 items.

The C-77 solar exam content outline includes pool systems, estimating and sizing, collectors, controls, open and closed loop systems, pipes and materials, system designs, and pumps and storage systems. The subject areas include pool systems with 1 item, estimating and sizing with 2 items, collectors with 3 items, controls with 3 items, open and closed loop systems with 5 items, pipes and materials with 5 items, system designs with 5 items, and pumps and storage systems with 6 items.

Because the C-77 path includes both plumbing and solar testing, candidates should plan study time carefully. The plumbing portion is broad and code-heavy, while the solar portion requires focused review of solar thermal system design and operation. Practice questions can help you build a testing rhythm, strengthen weak areas, and improve your ability to move between trade knowledge and reference navigation.

Open Book Test

The Arizona Plumbing, Including Solar Commercial Contractor (C-77) exam is an open-book exam. Candidates are responsible for bringing their own approved references to the examination center. Approved references may be highlighted, underlined, annotated, and indexed before the examination session. References may not be written in during the exam. Permanent tabs are allowed. Temporary removable tabs are not allowed. Additional loose or attached papers are not permitted with approved references.

For the C-77 plumbing exam, the approved exam-room references include the Code of Federal Regulations - 29 CFR Part 1926 (OSHA), International Fuel Gas Code, 2018, International Mechanical Code, 2018, International Plumbing Code, 2018, NFPA 13: Installation of Sprinkler Systems, 2016, NFPA 13D - Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes, 2007 Edition, NFPA 13R - Sprinkler Systems for Residential Occupancies up to and Including Four Stories in Height, 2007 Edition, and On-site Wastewater Treatment Facility Provisions in Unified Water Quality Permit Rule, Arizona Administrative Code Title 18, Chapter 9, 2006.

For the C-77 solar exam, the approved exam-room reference is the International Plumbing Code, 2018. The Solar Water and Pool Heating Design and Installation Manual is used for study but is not allowed in the examination center for the solar portion.

Several listed materials are useful for preparation but are not allowed in the examination center. These include Mathematics for Plumbers and Pipefitters, IPT’s Pipe Trades Handbook, Boiler Operator’s Guide, Arizona 811 - Arizona Blue Stake Brochure, Modern Hydronic Heating for Residential and Light Commercial Buildings, and Solar Water and Pool Heating Design and Installation Manual. Candidates should use these study references during preparation while bringing only approved references into the testing center.

Licensing Steps

Arizona contractor licensing is handled through the Arizona Registrar of Contractors. Applicants should begin by selecting the correct license classification for the work they plan to perform. For commercial plumbing work that includes solar, the relevant classification is C-77 Plumbing, Including Solar Commercial.

After selecting the correct classification, candidates should review the examination requirements tied to that license. The C-77 path includes the plumbing trade exam and the additional solar exam. Contractor applicants may also need to complete Arizona business management or statutes and rules requirements, application requirements, qualifying party requirements, bonding requirements, experience requirements, and other items required by the Arizona Registrar of Contractors.

A practical licensing plan separates exam preparation from application preparation. Exam preparation focuses on trade knowledge, plumbing code navigation, fuel gas, mechanical systems, sprinkler standards, wastewater provisions, hydronics, excavation, solar water heating, and safety. Application preparation focuses on state forms, business structure, qualifying party information, bond requirements, fees, and supporting documents.

Using online practice questions during the exam preparation phase gives structure to your study time. Questions help reveal which subjects are already familiar and which ones need more review. This makes it easier to use the 3-month access period productively and keeps your preparation focused on the topics most closely tied to the C-77 plumbing and solar exams.

State Requirements

The C-77 Plumbing, Including Solar Commercial classification includes installation, alteration, and repair of all plumbing, including solar, when performed solely within property lines and not on public easements or rights-of-way except as allowed by the classification.

The scope includes piping, fixtures, and appliances related to water supply, including pressure vessels and tanks, excluding municipal or related water supply systems. It also includes venting and sanitary drainage systems for fluid, semi-fluid, and organic wastes; septic tanks and leaching lines; roof leaders; lawn sprinkler systems; water conditioning equipment; and piping and equipment for swimming pools.

The classification also includes piping, fixtures, appliances, and pressure vessels for manufactured and natural gases, compressed air and vacuum systems, petroleum, fuel oil, non-potable liquids, hot water heating and hot water supply systems operating at pressures not exceeding 30 psig or temperatures not exceeding 220°F, steam heating and steam supply systems not exceeding 15 psig operating pressure, and gas- or oil-fired space heaters and furnaces excluding duct work. It also includes piping for water cooling systems excluding refrigerant piping and equipment, plus testing and balancing of hydronic systems.

Sewer, gas, and water lines and connections from a structure to the nearest point of public supply or disposal may cross public or private easements or be installed within private easements. Pipe installed across public property may not be increased in size or make another connection between the point of exit from private property and the point of connection at public supply or disposal. These lines may not be installed parallel to main lines in public easements or rights-of-way.

Reference Books

• Code of Federal Regulations - 29 CFR Part 1926 (OSHA)
  Used to review federal construction safety standards, including excavation safety, personal protective equipment, ladders, tools, equipment, hazard recognition, and worker protection topics.
• International Fuel Gas Code, 2018
  Used to study fuel gas piping systems, combustion air, venting, appliances, sizing, installation requirements, and gas system safety.
• International Mechanical Code, 2018
  Used to review mechanical system requirements, hydronic-related concepts, equipment provisions, ventilation, exhaust, and mechanical code topics connected to plumbing work.
• International Plumbing Code, 2018
  The primary plumbing code reference for drainage, waste and vent systems, water supply, fixtures, storm drainage, backflow prevention, water heaters, traps, interceptors, and solar-related plumbing provisions.
• NFPA 13: Installation of Sprinkler Systems, 2016
  A fire sprinkler reference used to review sprinkler system design, installation, components, water supplies, piping, spacing, and system requirements.
• NFPA 13D - Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes, 2007 Edition
  A sprinkler reference focused on one- and two-family dwellings and manufactured homes, including residential sprinkler system layout, components, and installation concepts.
• NFPA 13R - Sprinkler Systems for Residential Occupancies up to and Including Four Stories in Height, 2007 Edition
  A sprinkler reference focused on residential occupancies up to and including four stories in height, including installation concepts, system components, and protection requirements.
• On-site Wastewater Treatment Facility Provisions in Unified Water Quality Permit Rule, Arizona Administrative Code Title 18, Chapter 9, 2006
  A wastewater reference used to review Arizona on-site wastewater treatment provisions, septic-related requirements, permitting concepts, and disposal system rules.
• Mathematics for Plumbers and Pipefitters, 8th edition
  A study reference for plumbing and pipefitting math, including measurements, offsets, slopes, formulas, and practical trade problem-solving.
• IPT’s Pipe Trades Handbook, Robert A. Lee, 2016
  A pipe trades reference used to review pipe data, fittings, valves, measurements, threading, flanges, symbols, calculations, and field information.
• Boiler Operator’s Guide, 5th Edition
  A study reference for boiler operation concepts, hot water systems, steam systems, equipment, safety, maintenance awareness, and system operation fundamentals.
• Arizona 811 - Arizona Blue Stake Brochure
  A utility location reference used to review underground utility awareness, excavation notification practices, and damage prevention concepts.
• Modern Hydronic Heating for Residential and Light Commercial Buildings, John Siegenthaler, P.E., 2022
  A hydronic heating reference used to review hot water heating systems, piping arrangements, components, controls, system design concepts, and light commercial hydronic applications.
• Solar Water and Pool Heating Design and Installation Manual
  A solar thermal reference used to study solar water heating, pool heating, collectors, controls, open and closed loop systems, pumps, storage, piping, sizing, and system design.

Exam Room Approved Books

• Code of Federal Regulations - 29 CFR Part 1926 (OSHA)
  Approved for use during the C-77 plumbing exam and used for construction safety, excavation safety, personal protective equipment, access, tools, equipment, and jobsite hazard questions.
• International Fuel Gas Code, 2018
  Approved for use during the C-77 plumbing exam and used for fuel gas piping, sizing, venting, appliances, installation requirements, and gas safety questions.
• International Mechanical Code, 2018
  Approved for use during the C-77 plumbing exam and used for mechanical system requirements, equipment provisions, exhaust, ventilation, and related mechanical code topics.
• International Plumbing Code, 2018
  Approved for use during the C-77 plumbing exam and the C-77 solar exam, and used for plumbing code questions involving drainage, waste and vents, water supply, fixtures, backflow prevention, traps, storm drainage, water heaters, and solar-related plumbing provisions.
• NFPA 13: Installation of Sprinkler Systems, 2016
  Approved for use during the C-77 plumbing exam and used for sprinkler system installation, system components, piping, spacing, protection, and water supply questions.
• NFPA 13D - Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes, 2007 Edition
  Approved for use during the C-77 plumbing exam and used for residential sprinkler system concepts, installation requirements, and system components.
• NFPA 13R - Sprinkler Systems for Residential Occupancies up to and Including Four Stories in Height, 2007 Edition
  Approved for use during the C-77 plumbing exam and used for sprinkler systems in qualifying residential occupancies, including installation and protection concepts.
• On-site Wastewater Treatment Facility Provisions in Unified Water Quality Permit Rule, Arizona Administrative Code Title 18, Chapter 9, 2006
  Approved for use during the C-77 plumbing exam and used for Arizona on-site wastewater treatment provisions, septic-related requirements, and wastewater facility rules.

Test Information and Study Materials

The Arizona C-77 exam requires preparation across plumbing code, fuel gas, mechanical systems, hydronics, fire sprinklers, excavation, wastewater, and solar water heating. Candidates should study the complete outline because the exam includes both common plumbing topics and specialty areas that may not appear in every contractor’s daily work.

Drainage, waste and vent preparation should include trap protection, venting, fixture drainage, pipe sizing, cleanouts, slope, building drains, building sewers, and DWV system layout. Indirect waste preparation should include air gaps, air breaks, receptors, special waste discharge, and fixture connections. Water supply preparation should include pipe sizing, pressure, flow, materials, valves, water heaters, fixture supply, thermal expansion, and system protection.

Fuel gas preparation should include gas piping sizing, pressure, regulators, appliance connections, venting, combustion air, shutoff valves, testing, and installation safety. Septic and sewer preparation should include building sewers, disposal connections, septic system concepts, leaching lines, cleanouts, slope, and separation considerations. Hydronics preparation should include hot water heating systems, pumps, expansion tanks, boilers, piping arrangements, controls, valves, and system balancing.

Solar preparation should include collectors, controls, open-loop and closed-loop systems, pipes and materials, system designs, pumps, storage systems, estimating, sizing, and pool system applications. The solar portion is shorter than the plumbing exam, but it is still a required part of the C-77 plumbing including solar path, so candidates should give solar thermal study dedicated attention.

Online practice questions help candidates move from passive reading to active recall. When you miss a question, use it as a signal for what to review next. Return to the related code section, safety reference, pipe trades handbook, math topic, hydronic heating material, sprinkler standard, wastewater rule, or solar topic, then practice again until the material becomes more familiar.

How 1 Exam Prep Helps You Reach Your Goal

1 Exam Prep helps Arizona contractor candidates prepare with organized study guidance, trade-focused review, and practice-oriented exam preparation. For the Arizona Plumbing, Including Solar Commercial Contractor (C-77) exam, that means supporting your study routine with questions connected to commercial plumbing, solar water heating, drainage, waste and vents, water supply, backflow prevention, storm drainage, fixtures, fuel gas, septic and sewer, hydronics, fire sprinklers, excavation, isometric analysis, code navigation, and OSHA safety.

Many experienced plumbers understand field work but still need support with the testing format. Contractor exams require careful reading, time management, reference navigation, and the ability to connect each question to the correct trade concept or code book. Online practice questions help you become more comfortable with that process before exam day.

1 Exam Prep helps candidates study with structure instead of guessing what to review next. Practice questions can reveal weak areas, guide reference review, and reinforce the subjects most closely connected to the exam outline. This helps you use your 3-month access period effectively and keeps preparation focused.

For open-book exams, 1 Exam Prep also supports better reference navigation. Approved books are valuable, but they are most helpful when you know how to use them quickly. Practice-based study can help you learn when to use the plumbing code, fuel gas code, mechanical code, sprinkler standards, wastewater provisions, OSHA material, and solar study references without losing unnecessary time during the exam.

This product is designed to support confidence through preparation. It does not guarantee a passing score, license approval, or any state outcome. It gives you a practical way to study, review, and strengthen your understanding before taking the Arizona C-77 Plumbing, Including Solar Commercial Contractor exam.

FAQ Section

Who is this product for?

This product is for candidates preparing for the Arizona Plumbing, Including Solar Commercial Contractor (C-77) exam who want online practice questions and 3 months of access for self-paced study.

How long do I get access?

This product includes 3 months of access. During that period, you can work through online practice questions, review missed topics, and continue studying at your own pace.

Is the Arizona C-77 exam open book?

Yes. The Arizona C-77 Plumbing, Including Solar Commercial Contractor exam is open book and allows approved references into the examination center.

How many questions are on the Arizona C-77 plumbing exam?

The Arizona C-77 plumbing exam includes 100 questions, allows 240 minutes, and requires a minimum passing score of 70%.

Is there an additional solar exam?

Yes. The C-77 solar exam includes 30 questions, allows 75 minutes, and requires a minimum passing score of 70%.

Which book is allowed for the C-77 solar exam?

The International Plumbing Code, 2018 is the approved exam-room reference for the C-77 solar exam.

Is the Solar Water and Pool Heating Design and Installation Manual allowed in the exam room?

No. The Solar Water and Pool Heating Design and Installation Manual is a study reference for preparation, but it is not listed as an approved exam-room reference for the C-77 solar exam.

What subjects are covered on the C-77 solar exam?

The solar exam covers pool systems, estimating and sizing, collectors, controls, open and closed loop systems, pipes and materials, system designs, and pumps and storage systems.

Does this product include physical books?

This product is for online practice questions and includes 3 months of access. Physical books are not listed as included with this product.

Can online practice questions help with the C-77 exam?

Yes. Practice questions can help improve topic recognition, code navigation, timing, reference use, and comfort with plumbing and solar contractor exam wording before test day.