Idaho Limited Electrical Irrigation Sprinkler Installer Exam Prep Checklist
Everything for the Idaho Limited Electrical Irrigation Sprinkler 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 Irrigation Sprinkler Installer Exam Facts
From the official bulletin:
| Questions | 40 questions |
| Time limit | 2 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 Irrigation Sprinkler Installer Exam Topics
The official content outline has 5 topics:
| Topic | Questions | Share of the exam |
|---|---|---|
| 2017 National Electrical Code, NFPA – Introduction | 3 | 8% |
| 2017 National Electrical Code, NFPA – Chapter 1 | 5 | 12% |
| 2017 National Electrical Code, NFPA – Chapter 2 | 11 | 28% |
| 2017 National Electrical Code, NFPA – Chapter 3 | 5 | 12% |
| 2017 National Electrical Code, NFPA – Chapter 6 | 16 | 40% |
Idaho Limited Electrical Irrigation Sprinkler 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.
- Start with the biggest topics: 2017 National Electrical Code, NFPA – Chapter 6 and 2017 National Electrical Code, NFPA – Chapter 2 (68% of the exam).
- 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 Irrigation Sprinkler 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: 2 hours for 40 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 Irrigation Sprinkler Installer Sample Questions
From our practice question bank, with answers and references:
Sample 1 — 2017 National Electrical Code, NFPA – Chapter 3
Question: In conductor type designations, a type letter used alone indicates a single insulated conductor. What does the letter suffix "D" indicate?
- A. Two or more conductors twisted spirally
- B. A dual-rated temperature conductor
- C. Two conductors laid parallel in a covering
- D. A conductor listed for direct burial
Correct Answer: C
NEC 2017, Section 310.120(C) states that the suffix "D" indicates two insulated conductors laid parallel within an outer nonmetallic covering, while the suffix "M" indicates an assembly of two or more insulated conductors twisted spirally within an outer nonmetallic covering.
Reference: NEC 2017 Section 310.120(C)
Sample 2 — 2017 National Electrical Code, NFPA – Introduction
Question: In converting inch-pound units to metric units in the Code, which conversion shall be used where a negative impact on safety would result?
- A. Hard conversion
- B. Soft conversion
- C. Trade size designation
- D. Approximate rounded conversion
Correct Answer: B
NEC 2017, 90.9(C)(4) states that where a negative impact on safety would result, soft conversion shall be used. Soft conversion is a direct mathematical conversion that does not change the actual dimension, whereas hard conversion changes dimensions or properties into new sizes.
Reference: NEC 2017 Section 90.9(C)(4)
Sample 3 — 2017 National Electrical Code, NFPA – Chapter 6
Question: Several motors are permitted on one irrigation machine branch circuit protected at not more than 30 amperes without individual branch-circuit short-circuit and ground-fault protection. Under that allowance, no motor on the circuit may exceed what horsepower rating?
- A. 3 hp
- B. 1 hp
- C. 2 hp
- D. 1½ hp
Correct Answer: C
NEC 2017, 675.10(A) permits several motors, each not exceeding 2 hp, on an irrigation machine circuit protected at not more than 30 amperes at 1000 volts nominal or less, provided the additional conditions of 675.10(A)(1) through (3) are met.
Reference: NEC 2017 Section 675.10(A)
Sample 4 — 2017 National Electrical Code, NFPA – Chapter 2
Question: You drive a single ground rod at a new irrigation pump control panel and measure its resistance to earth. A supplemental electrode is NOT required if the measured resistance does not exceed what value?
- A. 10 ohms
- B. 15 ohms
- C. 25 ohms
- D. 5 ohms
Correct Answer: C
Per the Exception to NEC 250.53(A)(2), if a single rod, pipe, or plate grounding electrode has a resistance to earth of 25 ohms or less, the supplemental electrode is not required.
Reference: NEC 2017 Section 250.53(A)(2) Exception
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 Irrigation Sprinkler 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.