What Does the Arizona CR-15 Blasting Classification Cover?

The CR-15 Blasting classification covers the use of explosives and explosive devices for excavation, demolition, geological exploration, mining, and construction-related blasting.

The scope also includes work required to support those blasting operations, including drilling, boring, earth moving, and the construction of temporary shelters, barricades, protective devices, equipment, and related enclosures.

That is a serious amount of responsibility. Not surprisingly, the examination spends a large amount of time on explosive materials, shot preparation, storage, and safety.

Step 1: Confirm That CR-15 Is the Classification You Need

Before buying books or scheduling an exam, confirm your license classification with the Arizona Registrar of Contractors.

The current Arizona classification requirements list CR-15 Blasting as requiring four years of qualifying hands-on and/or managerial experience, along with the Arizona Statutes and Rules Exam and the trade examination.

The qualifying party is the individual who satisfies the experience and examination requirements for the business. Arizona generally requires the qualifying party to be regularly employed by the licensee and actively involved in the classification of work being performed.

Confirming this first sounds obvious, but it matters. Studying hard for the wrong classification is still studying for the wrong classification. That is basically measuring twice and cutting the wrong board anyway.

Review the Arizona Registrar of Contractors license classification requirements before beginning your exam preparation.

Step 2: Understand the Arizona Examination Path

Arizona currently separates the contractor examination process into the Arizona Statutes and Rules Exam, or SRE, and the applicable trade-specific examination.

The SRE is a computer-based training course and examination provided through the Arizona Registrar of Contractors. The current PSI bulletin lists the SRE cost at $61.

New applicants who were not previously listed as a qualifying party on another Arizona contractor license within the applicable period generally need to complete the SRE.

The CR-15 trade examination is administered through PSI. The current PSI fee for one trade examination is $66.

Current licensing information is available through the Arizona Registrar of Contractors application guide.

Step 3: Know the CR-15 Trade Exam Numbers

With 210 minutes for 80 scored questions, you have an average of about two minutes and 37 seconds per question.

PSI may also include a small number of experimental questions that are not scored. They still use examination time, so build a little extra room into your pacing plan.

During practice, aim comfortably above 70%. Walking into the real exam hoping to land exactly on the passing line is like parking a work truck one inch from a wall. It can work, but there is no reason to make life that exciting.

Step 4: Learn the CR-15 Exam Breakdown

The official PSI content outline divides the Arizona CR-15 Blasting examination into four major subject areas.

The first three categories account for 76 of the 80 scored questions. That should strongly influence how you divide your study time.

Explosives, Design, and Shot Preparation Deserves the Most Study Time

With 32 questions, Explosives, Design, and Shot Preparation is the biggest section of the CR-15 examination.

Your preparation should include the terminology, planning concepts, preparation requirements, material-related concepts, initiation concepts, calculations, and safety requirements connected with blasting operations.

Do not try to memorize disconnected facts without understanding where they belong. Instead, learn how the information is organized in your reference materials.

When you read a practice question, ask yourself two things:

1. What subject is this question testing?
2. Which reference is most likely to contain the answer?

Training yourself to make that decision quickly can save a surprising amount of time during an approved-reference exam.

Storage Is Almost One-Third of the Exam

Storage contributes 24 questions, so it deserves much more than a quick review the night before your appointment.

Become comfortable locating rules concerning explosive materials storage, magazines, protection, separation, security, compatibility, housekeeping, and related safety requirements.

NFPA 495, Explosive Materials Code is an important reference for this portion of your preparation.

Learn the table of contents. Learn the index. Know where definitions live. Become familiar with the chapters and tables that repeatedly appear while you work through practice questions.

Knowing that an answer is somewhere in the book is not enough. You need to find it before the clock starts acting like it has somewhere important to be.

Safety Accounts for 20 Questions

Safety makes up one-quarter of the scored examination, which means OSHA construction requirements and blasting-specific safety rules deserve serious attention.

Study areas may involve:

• Construction jobsite safety.
• Employee protection.
• Explosive-material handling.
• Hazardous conditions.
• Protective practices.
• Warning and site-control requirements.
• Equipment restrictions.
• Blasting-related OSHA requirements.

Safety questions often depend on very specific wording. Pay close attention to words such as minimum, maximum, required, prohibited, before, and after.

Do Not Ignore Transportation

Transportation contains only four questions, so it is easy to push it to the bottom of the study pile.

Do not skip it.

Review the rules that apply to transporting explosive materials, vehicle precautions, handling, separation, and related safety controls.

Four questions may not sound like much, but on a licensing exam every correct answer counts. A smaller subject can become a quick source of points when you know it well.

Step 5: Use the Correct CR-15 Reference Materials

The current CR-15 PSI content outline identifies the following references as allowed in the examination center:

• Code of Federal Regulations, 29 CFR Part 1926, OSHA, with the latest available amendments, or the applicable PSI selections.
• NFPA 495, Explosive Materials Code, 2018 Edition.

The examination outline also lists the ISEE Blasters' Handbook, 18th Edition, 2011 as a reference used to prepare examination questions.

That distinction is important. A reference can be useful for learning the material without being approved for use during the exam.

Review the Arizona exam books and preparation resources at Contractor Exam Preps and compare the editions with the latest PSI content outline before ordering.

Step 6: Prepare Your Approved Books Correctly

The CR-15 PSI outline allows approved references to be prepared before the examination.

Current rules allow approved materials to be:

• Highlighted before the exam.
• Underlined before the exam.
• Annotated before the exam.
• Indexed before the exam.
• Tabbed with permanent tabs.

Permanent tabs are tabs that would damage or tear the page if removed.

Temporary tabs, Post-it notes, removable tabs, and unauthorized loose or attached papers are not allowed.

PSI also states that candidates may not continue writing, highlighting, underlining, or indexing their references during the examination.

If you print an approved reference from the internet, it must be properly bound. PSI gives examples such as spiral binding or placing hole-punched pages into a binder.

Get this work done before test day. A reference book with 150 mystery tabs stuck everywhere is not organized. It is a paper jungle.

Step 7: Learn to Navigate the Books Fast

Approved references only help when you know how to use them.

Begin by learning the table of contents and index in each book. Then match major sections of your references to the four CR-15 exam categories.

Use permanent tabs for major chapters and commonly researched topics. Highlight important definitions, tables, exceptions, and rule language.

Then practice lookup drills.

1. Choose a practice question.
2. Identify the subject being tested.
3. Decide which reference should contain the answer.
4. Start a timer.
5. Locate the supporting information.
6. Record how long the lookup took.

Your first goal is accuracy. Your second goal is speed.

Eventually, you want to know which book to open before you start flipping pages.

Step 8: Study the ISEE Blasters' Handbook Before the Exam

Because the ISEE Blasters' Handbook is a test-development reference but is not allowed in the examination center, it should be part of your study plan before test day.

Use it to strengthen your understanding of blasting terminology, planning, general blasting principles, performance, troubleshooting concepts, and industry practices.

Then connect what you learn to the references you are allowed to use during the actual exam.

PSI notes that trade examinations may contain questions based on trade knowledge and general industry practices, not only sentences that can be copied directly from an approved code book.

In other words, the books are tools. They are not magical answer dispensers.

Step 9: Practice Calculations Before You Are Under Pressure

Blasting work can involve calculations and relationships connected with field planning and material use.

The current PSI bulletin allows candidates at an examination center to use a basic, silent, nonprinting, non-programmable, non-scientific calculator.

Practice with the same type of calculator before test day.

Get comfortable checking units, entering values correctly, and recognizing when an answer is obviously too large or too small.

Accuracy should come first. Speed arrives after enough repetition.

Step 10: Use a Four-Week CR-15 Study Plan

Your exact study schedule can change depending on your experience, but the important part is giving each subject a planned place on the calendar.

For Arizona-focused books, tabs, study guides, and other preparation options, browse the Arizona contractor licensing exam prep collection.

Step 11: Practice Using the Real 210-Minute Time Limit

Do not give yourself unlimited time during every practice session.

The real CR-15 trade exam gives you 210 minutes. At least some of your practice exams should use the same limit.

If one question is taking too long, mark it and move forward. Return to it after answering the questions you can solve more quickly.

A useful strategy is to make a first pass through easier questions, then spend your remaining time on questions that require deeper reference searches.

Spending eight minutes wrestling with one stubborn question while seven easier questions wait down the road is not a great trade.

Step 12: Watch for Important Words in the Question

Some examination questions become difficult because of one small word.

Watch carefully for:

• MOST
• LEAST
• MINIMUM
• MAXIMUM
• FIRST
• BEFORE
• AFTER
• EXCEPT
• NOT
• REQUIRED
• PROHIBITED

Mentally repeat the key word before choosing your answer.

If you look up the rule in a reference, compare the exact language in the book with the exact question. Do not choose an answer only because it sounds familiar from the jobsite.

Step 13: Know the Current PSI Retake Rules

Nobody plans to fail an exam, but knowing the retake rules removes one more surprise from the process.

The current PSI bulletin says candidates must wait 30 days before retaking an examination they did not pass.

Candidates are currently allowed three attempts. After three failed attempts, a 90-day waiting period applies before another attempt.

If you do not pass, PSI provides diagnostic information showing areas of strength and weakness.

Use it. Do not simply schedule the next attempt and repeat the same study plan with more coffee.

Step 14: Prepare for the PSI Appointment

For an in-person PSI examination, plan to arrive early and bring the required valid identification. The name on your identification should match the name used for scheduling.

Before leaving home, inspect every reference you plan to bring.

• Confirm the book is an approved reference.
• Check that your tabs are permanent.
• Remove unauthorized loose papers.
• Confirm printed references are properly bound.
• Bring only a calculator that meets PSI requirements.
• Review PSI's current security and testing rules.

Doing this the night before is much better than conducting a surprise tab inspection in the PSI parking lot.

Step 15: Remember That Passing CR-15 Is Only Part of Licensing

Passing the trade examination is an important milestone, but an exam score by itself does not create an Arizona contractor license.

The qualifying party must satisfy the applicable classification requirements and complete the licensing process with the Arizona Registrar of Contractors.

Arizona's application process can include:

• Identifying the qualifying party.
• Meeting the required experience standard.
• Completing the Arizona Statutes and Rules Exam.
• Passing the required trade examination unless a waiver applies.
• Completing required background checks.
• Obtaining the appropriate contractor license bond.
• Providing required identification.
• Submitting the license application and supporting documents.
• Paying applicable licensing fees.

The current PSI bulletin says the required exam results and completed license application should be submitted within two years of passing the examination.

Review the Arizona Registrar of Contractors licensing instructions before submitting your application.

A Simple Arizona CR-15 Exam Study Roadmap

1. Confirm that CR-15 Blasting is the correct Arizona classification.
2. Verify the latest Arizona ROC experience and examination requirements.
3. Complete or plan for the Arizona Statutes and Rules Exam.
4. Download and review the current PSI CR-15 content outline.
5. Obtain the correct editions of the approved reference materials.
6. Separate exam-room references from study-only references.
7. Set up permanent tabs, highlighting, and indexing before test day.
8. Spend the most study time on Explosives, Design, and Shot Preparation.
9. Give Storage and Safety major attention.
10. Do not ignore Transportation just because it has four questions.
11. Practice finding information in NFPA 495 and OSHA 29 CFR Part 1926.
12. Study the ISEE Blasters' Handbook before the exam.
13. Practice calculations with an approved-style basic calculator.
14. Take timed practice exams using the 210-minute limit.
15. Review every missed question and identify why you missed it.
16. Confirm PSI rules, identification, and reference requirements before your appointment.

Arizona CR-15 Exam Prep Resources

Good exam preparation is not about reading everything ever written about blasting. It is about studying the correct subjects, using the correct references, and practicing until you can find and apply information without wasting time.

Once your books are correct, your tabs are ready, and your study plan follows the actual examination percentages, CR-15 preparation becomes much more organized. You know where the points are, you know which books matter, and you know exactly what to practice.