Idaho Limited Electrical Sign Installer

How to Pass the Idaho Limited Electrical Sign Installer Exam

You don't have to guess how to prepare for the Idaho Limited Electrical Sign Installer exam. This guide lays it out: the key facts from the official bulletin, the topics on the test, the books you need, sample questions with answers, and a study plan you can follow. PSI gives the exam.

Idaho Limited Electrical Sign Installer Exam Basics

Here's what the official bulletin says about the exam:

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.

What's on the Idaho Limited Electrical Sign Installer Exam

The official content outline splits the exam into 5 topics:

Your Idaho Limited Electrical Sign Installer Study Plan

Your books are your best friend on this exam. It's open book, so the references on the bulletin's list are what you'll use on test day. Get your own copies in the editions the bulletin names.

Get to know them early. Spend time with each book's table of contents and index until you can find any major subject quickly. On an open-book exam, finding answers fast is the skill that counts.

Make the books yours. Highlight the sections you keep coming back to. The exam facts above list the bulletin's rules on tabs and markings, so follow them exactly.

Put your energy where the points are. 2017 National Electrical Code, NFPA – Chapter 6 and 2017 National Electrical Code, NFPA – Chapter 2 make up 68% of the exam, so start there.

Practice with the clock running. Our timed practice exams help you build the pace the real exam needs: about 3 minutes per question. Every attempt is another rep.

Keep going until you pass practice exams consistently. One good score is a great start. A few passing scores in a row is how you know you're ready.

Books You'll Need for the Idaho Limited Electrical Sign Installer Exam

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:

• NEC 2017

Test Day Tips

Start with a quick pass through the whole exam. Answer every question you're sure about and bookmark the rest. Every exam lets you return to bookmarked questions, so nothing is lost by moving on.

Then come back to your bookmarks and work through them one at a time. Keep an eye on the clock: you have 2 hours for 40 questions, which is about 3 minutes per question. Before you finish, make sure every question has an answer. 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.

Our practice exam is specifically designed to mimic the testing conditions at all exam centers. While untimed PDF study guides might help with studying, they don’t prepare you for the challenge of managing your time during an actual test.

Don't choose a word simply because it looks familiar. On difficult questions, you may not recognize several words in the answer choices—but that doesn't mean they're invented. Test writers only use real words. If you recognize the words in only one answer choice, focus on that choice and evaluate it carefully. If it's correct, great. If not, eliminate it. Every answer choice you eliminate improves your odds, even if you end up guessing among the remaining options.

Try These Idaho Limited Electrical Sign Installer Practice Questions

Give these a try. They come from our practice question bank, each with its answer and reference.

Sample 1 — 2017 National Electrical Code, NFPA – Chapter 3

Question: Copper or aluminum conductors of each phase, polarity, neutral, or grounded circuit conductor are permitted to be connected in parallel (electrically joined at both ends) only in what minimum size?

• A. 1 AWG
• B. 2 AWG
• C. 1/0 AWG
• D. 2/0 AWG

Correct Answer: C

NEC 2017, 310.10(H)(1) permits parallel conductors only in sizes 1/0 AWG and larger, except for the limited control-power and high-frequency applications of Exception No. 1 and the engineering-supervised 2 AWG/1 AWG neutral allowance of Exception No. 2.

Reference: NEC 2017 Section 310.10(H)(1)

Sample 2 — 2017 National Electrical Code, NFPA – Introduction

Question: In the dual system of units used throughout the Code, how are measurements presented?

• A. SI units first, inch-pound in parentheses
• B. Inch-pound units first, SI in parentheses
• C. Trade size designators in place of both
• D. Whichever system the authority specifies

Correct Answer: A

NEC 90.9(A) establishes SI (metric) as the system of preference, and 90.9(B) requires that SI units appear first with inch-pound units immediately following in parentheses. Per 90.9(D), compliance with the numbers shown in either system constitutes compliance with the Code.

Reference: NEC 2017 Section 90.9(B)

Sample 3 — 2017 National Electrical Code, NFPA – Chapter 6

Question: You are installing a pylon sign supplied by a branch circuit run up inside the metal pole that supports it, and you intend to use the point-of-entry option for the required disconnecting means. Where must the disconnecting means be located?

• A. At the nearest accessible junction box ahead of the sign
• B. Inside the sign at the lamp compartment
• C. At the service equipment supplying the branch circuit
• D. Where the circuit enters the sign enclosure, body, or pole

Correct Answer: D

NEC 2017, 600.6(A)(1) permits the disconnect to be located at the point the feeder circuit or branch circuit(s) supplying a sign or outline lighting system enters a sign enclosure, a sign body, or a pole, and it must open all ungrounded conductors where it enters that enclosure or pole.

Reference: NEC 2017 Section 600.6(A)(1)

Sample 4 — 2017 National Electrical Code, NFPA – Chapter 2

Question: Interior metal water piping that is electrically continuous with a metal underground water pipe electrode may be used to extend the grounding electrode conductor connection to the electrode only where the piping is located no more than what distance from the point of entrance to the building?

• A. 15 ft
• B. 5 ft
• C. 3 ft
• D. 10 ft

Correct Answer: B

NEC 2017, 250.68(C)(1) permits interior metal water piping that is electrically continuous with a metal underground water pipe electrode and located not more than 1.52 m (5 ft) from the point of entrance to the building to extend the connection to an electrode. Piping beyond 5 ft may not be used except under the industrial/commercial/institutional exception.

Reference: NEC 2017 Section 250.68(C)(1)

Why Practice Online?

Reading questions in a PDF is a start, but it doesn't prepare you for the clock. Our practice exams are timed and on a screen, so you build speed along with knowledge. Each attempt draws a new set of questions from our bank, and your results show your score by topic so you know where to focus next.

Ready to Start?

Take the free Idaho Limited Electrical Sign Installer practice exam and see where you stand today. Then focus on the topics that need the most work. For the official rules, read the exam bulletin, and see the licensing board's website.