Arizona Boilers, Steamfitting and Process Piping, Including Solar Commercial Contractor (C-74) Exam Book Package

Arizona Boilers, Steamfitting and Process Piping, Including Solar Commercial Contractor (C-74) Exam Book Package

The Arizona Boilers, Steamfitting and Process Piping, Including Solar Commercial Contractor (C-74) Exam Book Package is designed for candidates preparing for the Arizona C-74 Boilers, Steamfitting and Process Piping, Including Solar commercial contractor exam path. This package brings together the key references used to study commercial boiler systems, steam and hot water piping, gas piping, burners, controls, flues, vents, sizing, estimating, testing, inspection, process piping, mechanical code requirements, fuel gas code requirements, OSHA construction safety, hydronic heating, pipe trades fundamentals, and solar water and pool heating systems.

The Arizona C-74 classification is focused on commercial boilers, steamfitting, process piping, and solar-related boiler work. Candidates preparing for this license should be comfortable with steam and hot water systems, boiler installation and repair, chimney connections, flues, refractories, burners, piping, fittings, valves, thermal insulation, accessories, fuel and water lines serving boilers, process and specialty piping, pneumatic controls, electrical controls, and solar thermal system concepts. This exam book package supports both technical trade study and open book reference navigation.

Commercial boiler, steamfitting, process piping, and solar thermal work requires careful attention to safety, pressure, temperature, system operation, piping layout, fuel gas requirements, equipment installation, testing, inspection, and code compliance. The books in this package help candidates study code-based topics and practical trade concepts in an organized way. The approved exam-room references support open book lookup, while the supplemental study references help build the technical understanding needed to answer trade knowledge questions.

This package is a strong fit for commercial boiler contractors, steamfitters, pipefitters, hydronic heating professionals, process piping contractors, solar thermal installers, mechanical contractors, boiler technicians, service professionals, and qualifying parties preparing for the Arizona C-74 commercial contractor exam. Candidates can use these references to review the major exam areas and build familiarity with the books before test day.

Open book contractor exams require more than owning the books. Candidates need to know how each reference is organized, which topics belong in which book, and how to locate information quickly under time pressure. A strong study plan includes reviewing the exam content outline, reading through the references, learning indexes and chapter layouts, creating approved permanent tabs, highlighting useful sections before exam day, and practicing timed lookup. The goal is to make the approved references familiar enough that candidates can use them efficiently during the exam.

Exam Details

The Arizona C-74 Boilers, Steamfitting and Process Piping, Including Solar commercial contractor exam path includes the C-74 trade exam and the C-74 Solar exam. The C-74 trade exam includes 50 questions, a 120-minute time limit, and a minimum passing score of 70%. The C-74 Solar exam includes 30 questions, a 75-minute time limit, and a minimum passing score of 70%.

The C-74 trade exam content outline includes boilers, steam and hot water piping, gas piping, burners, controls, flues and vents, sizing and estimating, testing and inspection, and process piping. Boilers includes 10 questions. Steam and hot water piping includes 6 questions. Gas piping includes 6 questions. Burners includes 5 questions. Controls includes 5 questions. Flues and vents includes 4 questions. Sizing and estimating includes 4 questions. Testing and inspection includes 4 questions. Process piping includes 6 questions.

The solar exam content outline includes collection loops, components, installation, maintenance, mounting, principles, and solar systems piping. Candidates preparing for the C-74 classification should study the boiler and piping references along with the solar water and pool heating reference because the classification includes solar-related work.

The exam may include direct reference lookup questions and questions based on trade knowledge or general industry practices. Candidates should be ready to answer questions involving boiler systems, hydronic heating, steam piping, hot water piping, gas piping, burner operation, control systems, venting, flue connections, process piping, inspection procedures, testing requirements, estimating, solar collectors, solar piping, mounting, circulation loops, and safety standards.

The Arizona C-74 scope covers installation, alteration, and repair of steam and hot water systems and boilers, including solar. This includes chimney connections, flues, refractories, burners, piping, fittings, valves, thermal insulation, accessories, fuel and water lines from the source of supply to boilers, process and specialty piping and related equipment, and pneumatic and electrical controls. If necessary, a new circuit may be added to an existing service panel or sub-panel. Installation of a new service panel or sub-panel is excluded from the classification scope.

Open Book Test

The Arizona C-74 Boilers, Steamfitting and Process Piping, Including Solar commercial contractor exam path uses approved references for open book testing. Candidates are responsible for bringing their own approved references to the examination center and following all testing center rules for permitted materials, book preparation, tabs, notes, and calculator use.

The exam-room-approved references for the C-74 trade exam are Code of Federal Regulations - 29 CFR Part 1926 (OSHA), International Mechanical Code, and International Fuel Gas Code. This package includes the 2018 editions of the International Mechanical Code and International Fuel Gas Code.

Reference materials may be highlighted, underlined, annotated, and indexed before the examination session. Candidates may not write, highlight, underline, or index references during the exam. All book preparation should be completed before test day, including highlighting, notes, indexes, and tabs.

References may be tabbed or indexed with permanent tabs only. Permanent tabs are tabs that would tear the page if removed. Temporary tabs, Post-It notes, removable notes, loose papers, or any tabs that can be removed without tearing the page are not allowed. Candidates should review their books before the exam and remove unapproved temporary tabs or loose materials.

A silent, nonprinting, non-programmable calculator may be used in the examination center. Downloaded references may be brought into the testing center when they are bound. Candidates may use spiral binding or place hole-punched pages in a binder when permitted by current testing rules.

Low Pressure Boilers, 5th Edition, Modern Hydronic Heating for Residential and Light Commercial Buildings, IPT’s Pipe Trades Handbook, and Solar Water and Pool Heating Design and Installation Manual are study references for this package. They help candidates strengthen trade knowledge before test day. Candidates should separate approved exam-room references from supplemental study references when organizing materials for the exam.

Licensing Steps

Arizona contractor licensing is handled through the Arizona Registrar of Contractors. A candidate pursuing the Arizona Boilers, Steamfitting and Process Piping, Including Solar Commercial Contractor (C-74) license should begin by confirming that the C-74 commercial classification matches the work the business intends to perform. The classification should align with commercial boiler systems, steamfitting, process piping, fuel and water lines serving boilers, specialty piping, controls, solar-related boiler work, and related mechanical work.

After confirming the correct classification, the candidate should review the required examination path. Arizona contractor licensing may include trade examination requirements, statutes and rules requirements, qualifying party requirements, experience requirements, bonding, business entity information, and application documentation. This exam book package supports preparation for the technical trade exam portion of the licensing process.

The qualifying party is responsible for demonstrating the knowledge and experience required for the license classification. Candidates should prepare for the C-74 trade exam and the solar exam using the approved references and supporting study materials included in this package. After preparation, the candidate can schedule the required examinations through the proper testing process and complete the exams according to current procedures.

Once examination requirements are completed, the applicant continues through the Arizona contractor license application process. This may include submitting the correct application, naming the qualifying party, satisfying experience requirements, obtaining any required bond, and meeting other state licensing requirements that apply to the classification and business structure.

This exam book package does not replace the state license application. It supports the study portion of the licensing path by giving candidates the references needed to prepare for boilers, steam and hot water piping, gas piping, burners, controls, flues, vents, sizing, estimating, testing, inspection, process piping, solar thermal systems, OSHA safety, mechanical code, and fuel gas code topics connected to the Arizona C-74 classification.

State Requirements

The Arizona Registrar of Contractors issues residential, commercial, and dual contractor license classifications. The C-74 classification is a commercial boilers, steamfitting and process piping, including solar classification. Candidates preparing for this license should understand the commercial scope of work and the limits of the classification.

The C-74 scope includes installation, alteration, and repair of steam and hot water systems and boilers, including solar. This work includes chimney connections, flues, refractories, burners, piping, fittings, valves, thermal insulation, and accessories. It also includes fuel and water lines from the source of supply to boilers, process and specialty piping and related equipment, and pneumatic and electrical controls.

The classification allows a new circuit to be added to an existing service panel or sub-panel when necessary. It does not include installation of a new service panel or sub-panel. Candidates should understand this limitation because contractor scope questions and licensing responsibilities often depend on knowing what work is included and what work is excluded.

For study purposes, candidates should connect the license scope to the exam content outlines. Boiler questions may involve system components, installation practices, fittings, valves, controls, burners, safety devices, refractory materials, insulation, and boiler operation. Steam and hot water piping questions may involve pipe layout, materials, system components, pressure and temperature concepts, expansion, valves, fittings, and hydronic or steam distribution principles.

Gas piping questions may involve fuel gas piping, appliance connections, pipe sizing, pressure testing, shutoff valves, combustion air, venting, and safe fuel gas practices. Process piping questions may involve specialty piping systems, related equipment, pipe trade terminology, layout, fittings, testing, inspection, and field practices. Solar questions may involve collectors, circulation loops, components, mounting, maintenance, system principles, and solar systems piping.

Reference Books

• Code of Federal Regulations - 29 CFR Part 1926 (OSHA)
  This construction safety reference supports preparation for OSHA-related exam content, including jobsite hazards, personal protective equipment, ladders, fall protection, tools, material handling, hazard communication, excavation awareness, equipment safety, and safe construction practices.
• International Mechanical Code, 2018
  This mechanical code reference supports preparation for heating systems, mechanical equipment installation, ventilation, combustion air, hydronic piping, boilers, chimneys, vents, mechanical safety requirements, and commercial mechanical system compliance.
• International Fuel Gas Code, 2018
  This fuel gas code reference supports study for gas piping, pipe sizing, appliance installation, combustion air, venting, pressure testing, shutoff valves, clearances, gas-fired equipment, and fuel gas safety requirements.
• Low Pressure Boilers, 5th Edition
  This boiler reference supports study of low pressure steam and hot water boilers, boiler operation, boiler controls, safety devices, fittings, valves, combustion, maintenance, hydronic heating concepts, troubleshooting, and safe operating principles.
• Modern Hydronic Heating for Residential and Light Commercial Buildings, John Siegenthaler, P.E., 2022
  This hydronic heating reference supports study of hot water heating systems, piping arrangements, controls, pumps, heat emitters, heat transfer, system design concepts, and hydronic system performance for light commercial and related applications.
• IPT’s Pipe Trades Handbook, Robert A. Lee, 2016
  This pipe trades reference supports study of pipefitting terminology, pipe sizes, fittings, valves, flanges, threading, welding-related reference data, layout information, calculations, and practical field information used in pipe trades work.
• Solar Water and Pool Heating Design and Installation Manual
  This solar thermal reference supports preparation for solar water heating and pool heating systems, including collectors, circulation loops, components, installation methods, mounting, maintenance, system principles, and solar piping concepts.

Exam Room Approved Books

• Code of Federal Regulations - 29 CFR Part 1926 (OSHA)
  This reference may be used in the exam room for OSHA construction safety questions when prepared according to testing center rules.
• International Mechanical Code, 2018
  This reference may be used in the exam room for mechanical code questions, including heating equipment, ventilation, combustion air, hydronic piping, boilers, vents, chimneys, and mechanical equipment installation provisions.
• International Fuel Gas Code, 2018
  This reference may be used in the exam room for fuel gas code questions, including gas piping, appliance installation, combustion air, venting, pressure testing, clearances, and fuel gas safety requirements.

Test Information and Study Materials

A strong study plan should begin with the C-74 exam content outlines. Candidates should divide preparation across boilers, steam and hot water piping, gas piping, burners, controls, flues and vents, sizing and estimating, testing and inspection, process piping, and solar topics. Since the exam path includes both code-based and trade knowledge questions, candidates should study the approved code references and the supplemental technical references together.

When studying the International Mechanical Code, candidates should focus on mechanical equipment installation, heating systems, ventilation, combustion air, hydronic piping, boilers, chimneys, vents, and safety-related provisions. Candidates should practice using the index, definitions, tables, and chapter headings to locate information quickly.

When studying the International Fuel Gas Code, candidates should review fuel gas piping, pipe sizing, appliance installation, combustion air, venting, pressure testing, shutoff valves, connectors, clearances, and gas-fired equipment requirements. Fuel gas questions often require careful reading because the answer may depend on equipment type, location, pipe material, system pressure, venting method, or installation condition.

When studying OSHA, candidates should focus on safety topics that apply to commercial boiler, steamfitting, process piping, and solar work. This may include personal protective equipment, ladders, fall protection, hand and power tools, material handling, hazard communication, equipment safety, excavation awareness, and general jobsite safety. Safety questions often test hazard recognition and proper protective measures.

Low Pressure Boilers, 5th Edition supports the technical side of boiler preparation. Candidates should review boiler operation, steam and hot water systems, boiler controls, pressure and temperature concepts, safety devices, fittings, valves, burners, combustion, maintenance, troubleshooting, and safe operating practices.

Modern Hydronic Heating for Residential and Light Commercial Buildings supports study of hydronic system principles, piping layouts, pumps, controls, heat emitters, heat transfer, system design, and performance concepts. IPT’s Pipe Trades Handbook supports process piping and pipefitting preparation through practical data on pipe sizes, fittings, valves, flanges, threading, field calculations, and layout information.

Solar Water and Pool Heating Design and Installation Manual supports preparation for the solar portion of the exam path. Candidates should review solar system principles, collection loops, components, mounting, installation, maintenance, circulation, piping, and system operation. Solar-related study should connect design concepts with practical installation knowledge, safe roof and equipment work, system layout, component function, and integration with water or boiler-related systems.

How 1 Exam Prep Helps You Reach Your Goal

1 Exam Prep helps contractor candidates prepare with organized study guidance, trade-focused review, and exam preparation resources built around licensing exams. For the Arizona Boilers, Steamfitting and Process Piping, Including Solar Commercial Contractor (C-74) exam path, candidates need to understand commercial boiler systems, steamfitting, process piping, solar thermal systems, and fuel gas requirements while also learning how to navigate approved references under timed conditions.

This book package supports that preparation by giving candidates the references needed for structured study. OSHA, the International Mechanical Code, and the International Fuel Gas Code help candidates prepare for open book reference navigation. Low Pressure Boilers helps reinforce the technical understanding behind steam systems, hot water systems, boiler controls, safety devices, burners, maintenance, and boiler operation. Modern Hydronic Heating supports hydronic system knowledge, IPT’s Pipe Trades Handbook supports pipefitting and process piping study, and the solar manual supports solar water and pool heating preparation.

1 Exam Prep focuses on practical preparation. Candidates should know where information is located, how the books are organized, and which reference applies to each topic. With consistent review, proper book organization, and practice-oriented study, candidates can approach the Arizona C-74 exam path with a clearer strategy and stronger confidence.

For open book exams, confidence comes from preparation and familiarity. Candidates who study the references, organize their books correctly, and practice timed lookup are better prepared for the testing experience. The goal is not to promise a specific result. The goal is to support realistic preparation through structured review, reference navigation, trade-focused study, and exam-day readiness.

FAQ Section

What books are included in this Arizona C-74 Exam Book Package?

This package includes Code of Federal Regulations - 29 CFR Part 1926 (OSHA), International Mechanical Code, 2018, International Fuel Gas Code, 2018, Low Pressure Boilers, 5th Edition, Modern Hydronic Heating for Residential and Light Commercial Buildings by John Siegenthaler, P.E., 2022, IPT’s Pipe Trades Handbook by Robert A. Lee, 2016, and Solar Water and Pool Heating Design and Installation Manual.

Is the Arizona C-74 Boilers, Steamfitting and Process Piping, Including Solar exam open book?

Yes. The Arizona C-74 exam path uses approved references for open book testing. Candidates are responsible for bringing their own approved references and following exam center rules for tabs, highlighting, annotations, indexing, and permitted materials.

How many questions are on the Arizona C-74 trade exam?

The C-74 trade exam includes 50 questions. The time allowed is 120 minutes, and the minimum passing score is 70%.

How many questions are on the C-74 Solar exam?

The C-74 Solar exam includes 30 questions. The time allowed is 75 minutes, and the minimum passing score is 70%.

What topics are covered on the Arizona C-74 trade exam?

The exam content outline includes boilers, steam and hot water piping, gas piping, burners, controls, flues and vents, sizing and estimating, testing and inspection, and process piping.

What topics are covered on the solar exam?

The solar exam content outline includes collection loops, components, installation, maintenance, mounting, principles, and solar systems piping.

Which books are approved for the exam room?

The exam-room-approved references for the C-74 trade exam are Code of Federal Regulations - 29 CFR Part 1926 (OSHA), International Mechanical Code, and International Fuel Gas Code. This package includes the 2018 editions of the International Mechanical Code and International Fuel Gas Code.

Can I mark my books before exam day?

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

Are removable tabs allowed in the exam books?

No. Temporary tabs, Post-It notes, removable notes, and removable sticky tabs are not allowed. Permanent tabs are allowed when they would tear the page if removed.

Who should use this Arizona C-74 Exam Book Package?

This package is intended for candidates preparing for the Arizona Boilers, Steamfitting and Process Piping, Including Solar Commercial Contractor (C-74) exam path and for contractors who want focused references for commercial boilers, steamfitting, process piping, solar thermal systems, mechanical code, fuel gas code, OSHA safety, hydronic heating, and pipe trades study.