Idaho Limited Electrical Manufacturing Equipment Installer Practice Exam
Free Practice Exam
Test your knowledge with 10 questions from our pool of 20 free questions.
- 10 questions per attempt
- 30 minute time limit
- Unlimited attempts
- A new mix each time
- Instant results
Full Practice Exam
Complete exam simulation matching the real PSI test format.
- 40 questions (same as real exam)
- 120 minute time limit
- 6 topic areas covered
- 219 questions in pool
- Detailed explanations
Texts preferred · 9am–9pm Central
Idaho Limited Electrical Manufacturing Equipment Installer Practice Exam Guide
What's on the exam
Questions per topic, out of 40This practice exam is laid out like the official content outline for the Idaho Limited Electrical Manufacturing Equipment Installer exam: 2017 National Electrical Code, NFPA – Introduction, 2017 National Electrical Code, NFPA – Chapter 1, 2017 National Electrical Code, NFPA – Chapter 2, 2017 National Electrical Code, NFPA – Chapter 3, 2017 National Electrical Code, NFPA – Chapter 4, 2017 National Electrical Code, NFPA – Chapter 7.
Two ways to practice: the free practice exam gives you 10 questions per attempt, as often as you want. The full practice exam gives you 40 questions on a 2 hours clock, with a new draw from our question bank every time.
2017 National Electrical Code, NFPA – Introduction 6 items
Our study plan for this topic: Purpose and scope of the NEC (practical safeguarding of persons and property); Installations covered and not covered under NEC scope (Article 90.2); Code arrangement and chapter hierarchy (Chapters 1–9 and informative annexes); Mandatory vs. permissive rules and explanatory material (shall/shall not vs. shall be permitted); Authority having jurisdiction (AHJ) enforcement powers and special permission; Examination and listing of equipment for safety (Article 90.7); Units of measurement and dual SI/inch-pound system (Article 90.9); Wiring planning for future expansion and circuit limitation in enclosures (Article 90.8).
2017 National Electrical Code, NFPA – Chapter 1 6 items
Our study plan for this topic: Key NEC Article 100 definitions (approved, listed, labeled, identified, AHJ); Equipment examination, installation, and use requirements (Article 110.3); Working space and clearance requirements around electrical equipment (110.26); Electrical connections, splices, and termination temperature ratings (110.14); Equipment marking requirements including arc-flash hazard warnings and disconnecting means identification; Guarding of live parts and enclosure type selection (110.27, 110.28); Conductor materials, sizes, and wiring integrity requirements (110.5–110.8); Grounding and bonding definitions (grounded conductor, EGC, grounding electrode, bonding jumper).
2017 National Electrical Code, NFPA – Chapter 2 9 items
Our study plan for this topic: Grounding and bonding requirements (Article 250) — general principles and definitions; Grounding electrode system — types, installation, and sizing of grounding electrodes; Equipment grounding conductors — types, identification, sizing, and installation; Bonding methods for services, piping systems, and structural metal; Branch circuit requirements — ratings, conductor sizing, GFCI/AFCI protection, and required outlets; Overcurrent protection — fuses, circuit breakers, standard ratings, and location requirements; Branch-circuit, feeder, and service load calculations — demand factors and calculation methods; Feeder requirements — minimum conductor sizing, overcurrent protection, and grounded conductor identification.
2017 National Electrical Code, NFPA – Chapter 3 10 items
Our study plan for this topic: Conductor ampacity tables and temperature correction/adjustment factors (Article 310); Wiring methods — uses permitted and not permitted for conduit types (RMC, EMT, FMC, LFMC, LFNC, PVC); Securing and supporting requirements for raceways and cables; Box and conduit body fill calculations and sizing requirements (Article 314); Underground installation requirements and minimum cover depths (Articles 300, 310); Cable tray systems — installation, fill, ampacity, and grounding (Article 392); Conductors in parallel — requirements and restrictions (Article 310); Cabinets, cutout boxes, and enclosures — wiring space and conductor deflection (Article 312).
2017 National Electrical Code, NFPA – Chapter 4 6 items
Our study plan for this topic: Motor branch-circuit conductor sizing and ampacity (Article 430, Part II); Motor overload protection requirements and device ratings (Article 430, Part III); Motor branch-circuit short-circuit and ground-fault protective device ratings (Article 430, Part IV); Motor disconnecting means types, ratings, and location requirements (Article 430, Part IX); Motor controller ratings, marking, and design requirements (Article 430, Parts VII–VIII); Transformer overcurrent protection, installation, and transformer vault requirements (Article 450); Industrial control panel and industrial machinery supply conductor sizing and overcurrent protection (Articles 409 and 670); Flexible cord and flexible cable types, permitted uses, and ampacity (Article 400).
2017 National Electrical Code, NFPA – Chapter 7 3 items
Our study plan for this topic: Class 1 circuit classifications and power source requirements (power-limited vs. remote-control/signaling); Class 2 and Class 3 power source requirements and interconnection restrictions; Wiring methods and installation of Class 1 circuits; Separation requirements for Class 2 and Class 3 circuits from power and Class 1 conductors; Cable types, listing requirements, and substitution hierarchy for Class 2, Class 3, and PLTC cables; Installation locations and permitted uses for Class 2, Class 3, and PLTC cables by building area (plenum, riser, general-purpose); Type ITC cable uses permitted, construction specifications, and overcurrent protection requirements; Article 725 - Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits.
Sample 1 — 2017 National Electrical Code, NFPA – Chapter 3
Question: Per NEC 312.10(B), metal cabinets and cutout boxes constructed of sheet steel shall have a metal thickness not less than ______ mm (0.053 in.) uncoated.
- A. 1.02
- B. 1.35
- C. 1.59
- D. 2.36
Correct Answer: B
Per NEC 312.10(B), if enclosures within the scope of Article 312 are constructed of sheet steel, the metal thickness shall not be less than 1.35 mm (0.053 in.) uncoated.
Reference: NEC 2017 Section 312.10(B)
Sample 2 — 2017 National Electrical Code, NFPA – Chapter 2
Question: A 400 A service uses 600 kcmil copper service conductors. What is the minimum size of a copper grounding electrode conductor that runs only to a concrete-encased electrode?
- A. 2 AWG
- B. 4 AWG
- C. 3/0 AWG
- D. 1/0 AWG
Correct Answer: B
Table 250.66 would require a 1/0 AWG copper grounding electrode conductor for 600 kcmil copper service conductors, but 250.66(B) says a grounding electrode conductor (or bonding jumper) that runs only to a concrete-encased electrode is not required to be larger than 4 AWG copper. So the minimum size required here is 4 AWG copper.
Reference: NEC 2017 Section 250.66(B), Table 250.66
Sample 3 — 2017 National Electrical Code, NFPA – Introduction
Question: Per NEC 90.2(A), the Code covers the installation and removal of electrical conductors, equipment, and raceways; signaling and communications conductors, equipment, and raceways; and ______ cables and raceways.
- A. Coaxial
- B. Fiber optic
- C. Optical fiber
- D. Data communication
Correct Answer: C
Per NEC 90.2(A), the Code covers 'the installation and removal of electrical conductors, equipment, and raceways; signaling and communications conductors, equipment, and raceways; and optical fiber cables and raceways.' The specific term used in the Code is 'optical fiber.'
Reference: NEC 2017 Section 90.2(A)
Your first attempt is an inspection, not a final grade. The results page breaks your score down by outline topic, so you can see which areas need work. Compare it with the real exam's passing score, a minimum score of 70, and keep practicing until you pass consistently.
- Answer what you know first and bookmark the rest. Our practice exams let you bookmark and come back.
- Work your bookmarks on the second pass.
- Keep your pace. The real exam works out to about 3 minutes per question.
- After each attempt, look up each missed question's reference in your book and read the section.
| Questions | 40 questions |
| Time limit | 2 hours |
| Passing score | a minimum score of 70 |
| Books in the exam room | Open book |
| Exam fee | $75 |
- 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.