Arizona Solar Plumbing, Liquid System Only Commercial Contractor (C-78) Books Allowed into Exam Package

The Arizona Solar Plumbing, Liquid System Only Commercial Contractor (C-78) Books Allowed into Exam Package is designed for contractors preparing for the Arizona C-78 trade exam with the reference materials permitted inside the examination center. This package focuses on the books used for solar water heating systems, solar pool heating systems, plumbing code requirements, mechanical code requirements, OSHA construction safety standards, piping, pumps, storage systems, collectors, and control components.

The C-78 classification is a commercial contractor classification for solar plumbing liquid systems only. The scope includes installation, alteration, and repair of solar water heating systems operating at temperatures not exceeding 220 degrees Fahrenheit, including thermosyphon systems, direct open loop systems, and indirect closed loop systems. This classification excludes air as a transfer medium.

The C-78 scope also includes installation of collectors, storage and expansion tanks, heat exchangers, piping valves, pumps, sensors, and low voltage controls that connect to existing plumbing and electrical stub-outs at the water tank location. It also includes installation of solar heating systems for swimming pools that tie into and operate from the conventional pool system. The classification excludes non-solar plumbing, electrical, and mechanical systems and components. Backup and auxiliary heating systems are included only when they are part of the original contract and are an integral part of the solar collector or storage equipment.

This books allowed into exam package is built for candidates who want the approved exam-room references for the Arizona C-78 Solar Plumbing, Liquid System Only Commercial Contractor exam. Because this exam allows specific books in the testing center, preparation should include more than general solar or plumbing experience. Candidates should become familiar with the structure of each reference, learn where important sections are located, and practice locating answers quickly under timed exam conditions.

Solar plumbing liquid system work requires knowledge of plumbing systems, mechanical equipment, pipe materials, open loop and closed loop systems, pump and storage components, system design, collectors, controls, temperature limitations, and construction safety. The Arizona C-78 exam reflects that trade scope by testing practical knowledge along with the ability to use approved code and safety references effectively.

This package gives candidates the books allowed into the exam room so they can prepare with the same materials used on test day. The included references support study in OSHA construction safety, plumbing code provisions, mechanical code provisions, piping requirements, equipment installation, solar water heating components, and system design concepts. For an open book exam, owning the correct references is only the first step. Strong preparation comes from studying with those books, organizing them correctly, and learning how to use them efficiently.

What You Get

• Books Allowed into the Exam: This package includes the listed reference books permitted inside the Arizona C-78 Solar Plumbing, Liquid System Only Commercial Contractor exam room.
• Trade-Specific Reference Materials: The included books support study in OSHA construction safety, plumbing code requirements, mechanical code requirements, piping, pumps, storage systems, solar liquid heating systems, collectors, and controls.
• Open Book Exam Preparation Support: Candidates can study with the same approved references used during the exam.
• Reference Navigation Practice: These books help candidates practice locating definitions, sections, tables, safety rules, code provisions, and technical requirements before test day.

Exam Details

The Arizona C-78 Solar Plumbing, Liquid System Only Commercial Contractor trade exam has 60 questions. The minimum passing score is 70%, and the time allowed is 150 minutes.

The exam content outline includes general plumbing, pipes and materials, open and closed loop systems, pumps and storage systems, system designs, collectors, and controls. These subject areas reflect the practical knowledge needed for solar liquid heating systems and the code-reference skills needed for a timed open book contractor exam.

The general plumbing section includes 15 questions. Candidates should prepare for questions involving plumbing system principles, water piping concepts, code definitions, installation requirements, system connections, valves, fittings, and the way solar plumbing systems connect to existing plumbing stub-outs.

The pipes and materials section includes 7 questions. Candidates should study pipe materials, fittings, joining methods, compatibility, system pressure, temperature limits, installation practices, and general material selection for solar liquid systems. The International Plumbing Code is an important reference for this part of preparation.

The open and closed loop systems section includes 8 questions. Candidates should understand direct open loop systems, indirect closed loop systems, thermosyphon systems, system circulation, heat transfer, freeze protection concepts, and the differences between system configurations. Since the C-78 classification is limited to liquid systems, candidates should focus on water and liquid transfer systems rather than air-based solar systems.

The pumps and storage systems section includes 8 questions. Candidates should prepare for pump operation, storage tanks, expansion tanks, heat exchangers, circulation, system layout, and installation considerations. These components are a major part of solar water heating and solar pool heating systems.

The system designs section includes 12 questions. Candidates should study how collectors, pumps, piping, storage, controls, and plumbing connections work together as a complete system. This section may require candidates to understand layout, component relationships, temperature limitations, system purpose, and practical installation sequence.

The collectors section includes 5 questions. Candidates should review collector purpose, placement considerations, connection points, flow through collectors, solar heating principles, and how collector equipment fits into the overall liquid system. The controls section includes 5 questions and may involve sensors, low voltage controls, operating sequence, control functions, and interaction with pumps and other solar system components.

Open Book Test

The Arizona C-78 Solar Plumbing, Liquid System Only Commercial Contractor exam allows specific reference materials in the examination center. Candidates are responsible for bringing their own approved references to the exam. The approved books may be used during the examination session, which makes preparation with the correct reference package an important part of exam readiness.

Reference materials may be highlighted, underlined, annotated, and indexed before the exam. Candidates may not write, highlight, underline, or index the references during the examination session. Any book preparation should be completed before arriving at the testing center.

Additional papers are not permitted with approved references. Candidates should not bring loose notes, attached pages, inserted sheets, removable notes, or unapproved supplemental materials into the exam room. References should be organized, compliant, and ready for inspection before the exam begins.

Permanent tabs are allowed. Temporary tabs, including removable notes or tabs that can be removed without tearing the page, are not allowed. If a reference is downloaded from the internet, it may be brought into the testing center as long as it is bound. A downloaded reference may be spiral bound or hole-punched and placed in a binder.

Because the C-78 exam is timed, candidates should practice using the books before the exam. Reviewing the table of contents, index, chapter layout, definitions, tables, code sections, mechanical provisions, and OSHA safety topics can improve speed and confidence. The strongest open book preparation comes from knowing where information is located before the exam begins.

Licensing Steps

Arizona contractor licensing is handled through the Arizona Registrar of Contractors. Candidates pursuing the C-78 Solar Plumbing, Liquid System Only Commercial Contractor classification must follow the Arizona contractor licensing process and satisfy the requirements that apply to the commercial license classification.

A practical licensing path begins with confirming that C-78 is the correct classification for the work being performed. This classification applies to commercial solar plumbing liquid systems only, including solar water heating systems, thermosyphon systems, direct open loop systems, indirect closed loop systems, solar heating systems for swimming pools, collectors, storage and expansion tanks, heat exchangers, piping valves, pumps, sensors, and low voltage controls that connect to existing plumbing and electrical stub-outs at the water tank location.

After selecting the correct classification, the qualifying party should prepare for the required trade exam. Preparation should include obtaining the approved references, reviewing the exam content outline, studying each major subject area, and practicing open book navigation. Candidates should also make sure their books are highlighted, tabbed, annotated, indexed, and bound according to testing-center rules before exam day.

Arizona contractor applicants generally need to complete the application process through the Arizona Registrar of Contractors and meet the requirements that apply to the business structure, qualifying party, experience, financial responsibility, bonding, and required examinations. Contractors should also understand that trade licensing works alongside local project requirements, permits, inspections, safety standards, building codes, and any utility or site requirements that may apply to a specific solar plumbing project.

Once the required exams and application steps are completed, the applicant can move forward through the license review process. For contractors planning to perform commercial solar plumbing liquid system work in Arizona, preparation for the C-78 trade exam is an important step toward operating within the proper classification.

State Requirements

The Arizona C-78 Solar Plumbing, Liquid System Only Commercial Contractor classification allows the licensee to install, alter, and repair solar water heating systems operating at temperatures not exceeding 220 degrees Fahrenheit. These systems include thermosyphon systems, direct open loop systems, and indirect closed loop systems, while excluding air as a transfer medium.

The classification includes installation of collectors, storage and expansion tanks, heat exchangers, piping valves, pumps, sensors, and low voltage controls that connect to existing plumbing and electrical stub-outs at the water tank location. It also includes installation of solar heating systems for swimming pools that tie into and operate from the conventional pool system.

The classification excludes non-solar plumbing, electrical, and mechanical systems and components. Backup and auxiliary heating systems are included only when they are part of the original contract and are an integral part of the solar collector or storage equipment.

This classification is important for commercial contractors involved in solar water heating and solar pool heating work. These systems involve plumbing connections, mechanical components, circulating liquid, storage equipment, collectors, control components, temperature limitations, and safe installation practices. Contractors should stay within the C-78 scope and obtain any additional license classification required for work outside that scope.

Arizona candidates should also recognize that solar plumbing liquid system work may involve local permitting, inspection requirements, building code compliance, plumbing code compliance, mechanical code compliance, jobsite safety, and coordination with other trades. Studying with the approved references helps candidates build familiarity with the technical materials connected to these responsibilities.

Reference Books

• Code of Federal Regulations - 29 CFR Part 1926 (OSHA)
  This construction safety reference covers OSHA standards for construction work. It supports preparation for safety-related exam questions involving jobsite hazards, ladders, scaffolds, excavation, personal protective equipment, electrical hazards, equipment use, and general construction safety requirements.
• International Plumbing Code, 2018
  This plumbing code reference supports study of plumbing definitions, piping materials, fixtures, water supply concepts, installation standards, valves, fittings, system connections, and code navigation relevant to solar plumbing liquid systems.
• International Mechanical Code, 2018
  This mechanical code reference supports study of mechanical system requirements, equipment installation, hydronic concepts, piping provisions, controls, ventilation-related provisions when applicable, and mechanical code navigation relevant to solar liquid heating systems.

Exam Room Approved Books

The following books are allowed into the Arizona C-78 Solar Plumbing, Liquid System Only Commercial Contractor exam room:

• Code of Federal Regulations - 29 CFR Part 1926 (OSHA)
  This OSHA construction safety reference is allowed in the exam room and supports safety-related questions.
• International Plumbing Code, 2018
  This plumbing code book is allowed in the exam room and supports code-based plumbing, piping, and system connection questions.
• International Mechanical Code, 2018
  This mechanical code book is allowed in the exam room and supports mechanical equipment, system installation, piping, and controls questions.

Candidates should prepare these references before test day. The books may be highlighted, underlined, annotated, and indexed before the exam, but not during the exam. Permanent tabs are allowed. Temporary removable tabs and loose papers are not allowed. Bound internet downloads may be used when properly bound.

Test Information and Study Materials

The Arizona C-78 exam contains 60 questions, requires a 70% minimum passing score, and allows 150 minutes. The content outline includes general plumbing, pipes and materials, open and closed loop systems, pumps and storage systems, system designs, collectors, and controls.

For general plumbing, candidates should review water piping principles, plumbing code organization, valves, fittings, system connections, protection of piping, installation requirements, and plumbing terminology. Since the C-78 classification connects solar equipment to existing plumbing stub-outs at the water tank location, plumbing code familiarity is a major part of preparation.

For pipes and materials, candidates should study material selection, pipe compatibility, temperature considerations, pressure-related concepts, joining methods, supports, fittings, and installation practices. Solar liquid systems rely on properly selected and installed piping components to move heated liquid through the system safely and effectively.

For open and closed loop systems, candidates should understand how direct open loop, indirect closed loop, and thermosyphon systems operate. Study should include system circulation, heat transfer, water movement, use of heat exchangers, system protection, and the differences between direct and indirect heating arrangements.

For pumps and storage systems, candidates should review pump purpose, circulation, storage tanks, expansion tanks, heat exchangers, flow, controls, and component relationships. These topics are central to solar water heating and solar pool heating system performance.

For system designs, candidates should study how the complete system is arranged, how collectors connect to piping and storage, how pumps and controls interact, and how the system ties into existing plumbing. This section has 12 questions and should receive careful attention during exam preparation.

For collectors, candidates should review collector function, liquid flow through collectors, placement considerations, solar heating principles, and system integration. For controls, candidates should study sensors, low voltage controls, control sequence, pump activation, and the way control components support safe and efficient operation.

For safety, candidates should review OSHA construction standards and understand how jobsite safety applies to solar plumbing work. Candidates may need to understand ladder safety, fall hazards, personal protective equipment, electrical awareness, tools, equipment, and general construction-site hazard prevention.

A strong study routine combines reading, reference navigation, and timed practice. Candidates should learn where major topics are located in each book, mark permitted sections before the exam, and practice finding information quickly. The open book format rewards candidates who understand how to use their references efficiently.

How 1 Exam Prep Helps You Reach Your Goal

1 Exam Prep helps Arizona C-78 candidates prepare with organized study guidance, trade-focused review, and the approved books needed for the exam room. Contractor exams can be challenging because they combine field knowledge, code references, technical standards, safety rules, and timed testing. A structured approach helps candidates stay focused and prepare with confidence.

This books allowed into exam package supports candidates by placing the approved references in one focused preparation path. Instead of relying on unrelated materials, candidates can work directly with the books tied to the Arizona C-78 exam. That helps build familiarity with reference navigation, section location, code terminology, and exam-room organization.

1 Exam Prep emphasizes practical preparation. For the C-78 exam, that means reviewing general plumbing, pipes and materials, open and closed loop systems, pumps and storage systems, system designs, collectors, controls, and OSHA safety. These areas reflect solar plumbing liquid system work and help candidates connect jobsite experience with written exam questions.

For an open book test, knowing how to use the references is a major part of preparation. 1 Exam Prep helps students focus on reference navigation, permanent tab organization when applicable, key topic review, and practice-oriented study habits. Candidates can become more comfortable with the layout of each book before test day.

This package is ideal for commercial solar plumbing contractors, qualifying parties, solar water heating installers, solar pool heating professionals, plumbing contractors expanding into solar liquid systems, and business owners preparing for the Arizona C-78 licensing exam. With the approved books in hand and a structured study plan, candidates can approach the exam with stronger organization and better familiarity with the materials allowed in the testing center.

FAQ Section

What is the Arizona C-78 contractor license for?

The Arizona C-78 Solar Plumbing, Liquid System Only Commercial Contractor classification covers installation, alteration, and repair of solar water heating systems operating at temperatures not exceeding 220 degrees Fahrenheit, including thermosyphon, direct open loop, and indirect closed loop systems. It also includes certain solar pool heating systems and related solar plumbing components.

Is the Arizona C-78 exam open book?

Yes. The Arizona C-78 exam allows specific approved reference materials in the examination center. Candidates must bring their own approved books and follow the testing rules for markings, tabs, binding, and loose materials.

How many questions are on the Arizona C-78 exam?

The Arizona C-78 Solar Plumbing, Liquid System Only Commercial Contractor exam has 60 questions.

How much time is allowed for the Arizona C-78 exam?

The time allowed for the Arizona C-78 exam is 150 minutes.

What score is required to pass the Arizona C-78 exam?

The minimum passing score for the Arizona C-78 exam is 70%.

What topics are covered on the Arizona C-78 exam?

The exam covers general plumbing, pipes and materials, open and closed loop systems, pumps and storage systems, system designs, collectors, and controls.

Which books are allowed into the Arizona C-78 exam?

The allowed books include Code of Federal Regulations - 29 CFR Part 1926 (OSHA), International Plumbing Code, 2018, and International Mechanical Code, 2018.

Can I highlight or underline my books before the exam?

Yes. Approved reference materials may be highlighted, underlined, annotated, and indexed before the examination session. Candidates may not write, highlight, underline, or index the books during the exam.

Are removable tabs allowed in the exam books?

No. Temporary removable tabs are not allowed. References may be tabbed or indexed with permanent tabs only.

Can I bring loose notes into the exam?

No. Additional loose or attached papers are not permitted with approved references.

Can downloaded references be used in the testing center?

Downloaded references may be used when they are bound. A downloaded reference may be spiral bound or hole-punched and placed in a binder.

Does the C-78 classification include air as a transfer medium?

No. The C-78 classification is for solar plumbing liquid systems only and excludes air as a transfer medium.

Why should I study with the exam-room approved books?

Studying with the approved books helps candidates become familiar with the same references they can use during the exam. This supports faster lookup, better organization, and stronger preparation for open book questions.