Idaho Limited Electrical Photovoltaic Installer Exam Prep Checklist
Everything for the Idaho Limited Electrical Photovoltaic Installer exam in one place: the bulletin's key facts, the topics and how many questions each carries, the reference books, sample questions with answers, and a prep checklist. PSI gives the exam.
Idaho Limited Electrical Photovoltaic Installer Exam Facts
From the official bulletin:
| Questions | 60 questions |
| Time limit | 3 hours |
| Passing score | a minimum score of 70 |
| Books in the exam room | Open book |
| Exam fee | $75 |
On exam day
- You must present one current, government-issued photo and signature ID (such as a driver's license, state ID card, passport, military ID, or alien registration card) to be admitted.
- Arrive 15 minutes before your appointment time.
- Candidates must bring their own reference materials, and anyone caught writing in references or holding unauthorized materials has the binder seized and is reported to the Division.
- Highlighting, underlining and permanent indexing done before the exam are permitted, while writing during the session and temporary markers such as Post-its are prohibited.
- Only approved items may be brought into the exam room; all other personal belongings, including electronics, writing devices, bags, food and drinks, must be placed in secure storage.
References you may bring
- NFPA 70 – National Electrical Code (2017)
- Ferm's Fast Finder Index (2017)
- Key Word Index by Tom Henry (2017)
- Ugly's Electrical References
Scheduling, changes and retakes
- You may schedule online through PSI's registration website or by calling PSI at 855-340-3713.
- You may cancel and reschedule without forfeiting your fee if PSI receives your cancellation notice 2 days before the scheduled examination date, done by website or by phone (not voicemail or email).
- If you miss your appointment, arrive after the examination start time, cancel late, or lack proper ID, your registration is invalid and you forfeit your examination fee.
- Your score is shown on screen at the end of the exam and a score report is provided, with a diagnostic report of strengths and weaknesses if you fail.
- If you do not pass, you may retake the exam as many times as needed, paying an examination fee for each attempt.
Source: Examination Scheduling Procedures / Examination Guide (Idaho PSI Candidate Bulletin), Effective 7/9/2026. Check the bulletin before test day: fees and rules can change.
Idaho Limited Electrical Photovoltaic Installer Exam Topics
The official content outline has 10 topics:
| Topic | Questions | Share of the exam |
|---|---|---|
| 2017 National Electrical Code, NFPA – Introduction | 5 | 8% |
| 2017 National Electrical Code, NFPA – Chapter 1 | 7 | 12% |
| 2017 National Electrical Code, NFPA – Chapter 2 | 7 | 12% |
| 2017 National Electrical Code, NFPA – Chapter 3 | 6 | 10% |
| 2017 National Electrical Code, NFPA – Chapter 4 | 6 | 10% |
| 2017 National Electrical Code, NFPA – Chapter 5 | 6 | 10% |
| 2017 National Electrical Code, NFPA – Chapter 6 | 10 | 17% |
| 2017 National Electrical Code, NFPA – Chapter 7 | 5 | 8% |
| 2017 National Electrical Code, NFPA – Chapter 9 | 3 | 5% |
| 2017 National Electrical Code, NFPA Calculations – Chapters 4 and 9 | 5 | 8% |
Idaho Limited Electrical Photovoltaic Installer Exam Prep Checklist
- Get the reference books the bulletin lists, in the editions it names.
- Learn each book's table of contents and index first.
- Highlight the sections you use most. The exam facts above list the bulletin's rules on tabs and markings, so follow them exactly.
- Take our timed practice exams until you pass several in a row.
- After each attempt, look up every question you missed in your book.
- Practice at the real exam's pace: about 3 minutes per question.
Idaho Limited Electrical Photovoltaic Installer Exam Reference Books
The 2017 NFPA 70 National Electrical Code is the allowed reference, and the 2017 Ferm's Fast Finder Index, 2017 Key Word Index by Tom Henry and Ugly's Electrical References may also be used as optional references not used to develop the exam.
Where to get them:
Test Day Checklist
- First pass: answer every question you know. Bookmark the rest. Every exam lets you return to bookmarked questions.
- Second pass: work through your bookmarks.
- Pace: 3 hours for 60 questions, which is about 3 minutes per question.
- Last step: answer anything still blank. A blank can't earn a point.
Study Tips
On an open-book exam, the winners aren't the smartest people in the room — they're the fastest at finding answers. Buy the required book, practice with it open, and tab and highlight each section the first time a question sends you there. Learn the index and table of contents until you can land on any topic in seconds. That speed is what separates a pass from a fail.
On an open-book exam, work through every question once: answer the ones you know and skip the ones you don't. Then go back to the ones you flagged. You can bookmark questions for later review, just like on our exams — and don't sink too much time into any single question. The clock is still running.
Give yourself at least three to six weeks. Use your exam's candidate bulletin as your roadmap for what's tested, and spend your time on finding-it-fast skills over rote memorization. In practice, aim for three clean passes at 80% or higher — setting your practice bar above the real cut score gives you a comfortable margin on test day.
Practicing against a ticking clock is the best way to beat exam-clock anxiety. Use these timed tests to build your pacing, so you learn to move steadily and never burn too long on a single question. By test day, the format feels routine.
Idaho Limited Electrical Photovoltaic Installer Sample Questions
From our practice question bank, with answers and references:
Sample 1 — 2017 National Electrical Code, NFPA – Chapter 3
Question: The adjustment factors for more than three current-carrying conductors do not apply to conductors in a raceway whose length does not exceed:
- A. 1.5 m (5 ft)
- B. 300 mm (12 in.)
- C. 900 mm (36 in.)
- D. 600 mm (24 in.)
Correct Answer: D
NEC 310.15(B)(3)(a)(2) states that adjustment factors shall not apply to conductors in raceways having a length not exceeding 600 mm (24 in.).
Reference: NEC 2017 Section 310.15(B)(3)(a)
Sample 2 — 2017 National Electrical Code, NFPA – Chapter 4
Question: You are installing oil-insulated transformers with a nominal voltage of 480 volts indoors, in a section of the building classified as combustible, and suitable arrangements have been made to prevent a transformer oil fire from igniting other materials. Without constructing a vault, what is the maximum total transformer capacity permitted in one location?
- A. 25 kVA
- B. 75 kVA
- C. 112½ kVA
- D. 10 kVA
Correct Answer: D
Exception No. 2 to NEC 2017, Section 450.26 permits oil-insulated transformers of 1000 volts or less to be installed indoors without a vault, with suitable fire-spread arrangements, where the total capacity in one location does not exceed 10 kVA in a section of the building classified as combustible (75 kVA where the surrounding structure is fire-resistant construction).
Reference: NEC 2017 Section 450.26 Exception No. 2
Sample 3 — 2017 National Electrical Code, NFPA – Chapter 5
Question: You are roughing in an intensive care unit bed location classified as a critical care (Category 1) space. What is the minimum number of receptacles required at that patient bed location?
- A. 20
- B. 8
- C. 6
- D. 14
Correct Answer: D
Per NEC 2017, 517.19(B)(1), each critical care (Category 1) patient bed location shall be provided with a minimum of 14 receptacles, at least one of which is connected to the normal system branch circuit or to a critical branch circuit supplied by a different transfer switch.
Reference: NEC 2017 Section 517.19(B)(1)
Sample 4 — 2017 National Electrical Code, NFPA – Introduction
Question: According to NEC 90.4, who has the responsibility for making interpretations of the rules of the Code, deciding on the approval of equipment and materials, and granting special permission?
- A. The electrical contractor performing the installation
- B. The equipment manufacturer
- C. The authority having jurisdiction for enforcement of the Code
- D. The National Fire Protection Association
Correct Answer: C
NEC 90.4 states that the authority having jurisdiction (AHJ) for enforcement of the Code has the responsibility for making interpretations of the rules, for deciding on the approval of equipment and materials, and for granting the special permission contemplated in a number of the rules.
Reference: NEC 2017 Section 90.4
Online Practice vs. a PDF
- Timed: you practice finding answers under time pressure, not just reading them.
- Bookmarks: flag questions and come back, the way you will on test day.
- New sets: each attempt draws new questions from our bank.
- Scored by topic: your results show which outline topics need more study.
Next Step
- Take the free Idaho Limited Electrical Photovoltaic Installer practice exam.
- Study the topics where you scored lowest.
- Read the exam bulletin for the official rules, and see the licensing board's website.