Idaho Limited Electrical Limited Energy 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
- 198 questions in pool
- Detailed explanations
Texts preferred · 9am–9pm Central
Idaho Limited Electrical Limited Energy 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 Limited Energy 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 7, 2017 National Electrical Code, NFPA Calculations – Chapter 2.
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 by the NEC (90.2); Code arrangement and chapter organization (90.3); Authority having jurisdiction (AHJ) roles and enforcement (90.4); Mandatory vs. permissive rules and explanatory material (90.5); Equipment examination, listing, and approval for safety (90.7); Wiring planning for future expansion and circuit limitations (90.8); Units of measurement and SI vs. inch-pound compliance (90.9).
2017 National Electrical Code, NFPA – Chapter 1 4 items
Our study plan for this topic: Key NEC Article 100 definitions (accessible, approved, labeled, listed, identified); Branch circuit types and definitions (general-purpose, individual, multiwire, appliance); Grounding and bonding terminology (grounded conductor, EGC, grounding electrode, bonding jumper); Equipment approval, listing, and labeling requirements (Article 110.2–110.3); Electrical connections, splices, and termination temperature ratings (Article 110.14); Working space and clearance requirements around electrical equipment (Article 110.26); Guarding of live parts and enclosure type selection (Articles 110.27–110.28); Equipment markings, arc-flash hazard warnings, and disconnecting means identification (Articles 110.16, 110.21–110.22, 110.24).
2017 National Electrical Code, NFPA – Chapter 2 3 items
Our study plan for this topic: Grounding and bonding requirements (Article 250) — system grounding, grounding electrode systems, and equipment grounding conductors; Branch circuit requirements — ratings, conductor sizing, GFCI and AFCI protection, and required outlets (Article 210); Overcurrent protection — fuses, circuit breakers, tap conductor rules, and location requirements (Article 240); Branch-circuit, feeder, and service load calculations — dwelling and non-dwelling demand factors and optional calculation methods (Article 220); Use and identification of grounded conductors — color coding, terminal identification, and polarity (Article 200); Grounding electrode types, installation, and sizing of grounding electrode conductors; Bonding requirements — service equipment, piping systems, structural metal, and communication systems; Equipment grounding conductor types, sizing, and identification.
2017 National Electrical Code, NFPA – Chapter 3 8 items
Our study plan for this topic: Conductor ampacity tables and temperature ratings (Article 310); Ampacity adjustment and correction factors for conductors; Protection of cables and raceways against physical damage (Article 300); Underground wiring installation requirements and minimum cover depths; Box and conduit body fill calculations and sizing (Article 314); Securing and supporting requirements for conduit types (EMT, RMC, PVC, FMC, LFMC, LFNC); Uses permitted and not permitted for wiring methods (NM cable, MC cable, conduit types); Cable tray installation, fill requirements, and ampacity (Article 392).
2017 National Electrical Code, NFPA – Chapter 7 18 items
Our study plan for this topic: Class 1, Class 2, and Class 3 circuit definitions and power source requirements; Fire alarm circuit types: power-limited (PLFA) and non-power-limited (NPLFA); Cable types, listing requirements, and substitution hierarchy for low-voltage systems; Separation and installation of conductors in different circuit types; Optical fiber cable types, installation, and grounding requirements; Fire-resistive cable systems and circuit integrity (CI) cable requirements; Instrumentation tray cable (Type ITC) uses, installation, and construction; Energy management systems: load control restrictions and field marking requirements.
2017 National Electrical Code, NFPA Calculations – Chapter 2 1 item
Our study plan for this topic: Branch-circuit load calculations using unit lighting loads (Table 220.12); Demand factors for general lighting loads by occupancy type (Table 220.42); Minimum load calculations for receptacle outlets and specific appliances (220.14); Small-appliance and laundry circuit loads for dwelling units (220.52); Feeder and service load calculations for electric ranges and cooking appliances (Table 220.55); Demand factors for electric clothes dryers in dwelling units (Table 220.54); Optional feeder and service load calculations for dwelling units (220.82); Farm load calculations and demand factors (Tables 220.102 and 220.103).
Sample 1 — 2017 National Electrical Code, NFPA – Chapter 7
Question: You are routing power-limited circuit cables in an outdoor cable tray at an industrial site. Which cable type is required for cables installed in cable trays outdoors?
- A. Type CL2R
- B. Type CL3X
- C. Type PLTC
- D. Type CL3P
Correct Answer: C
Per NEC 2017, 725.135(H), cables installed in cable trays outdoors shall be Type PLTC. The plenum, riser, and limited-use types listed are permitted only for the in-building applications shown in Table 725.154.
Reference: NEC 2017 Section 725.135(H)
Sample 2 — 2017 National Electrical Code, NFPA – Chapter 3
Question: Which letter suffix added to a conductor type designation indicates an assembly of two or more insulated conductors twisted spirally within an outer nonmetallic covering?
- A. D
- B. S
- C. T
- D. M
Correct Answer: D
Per NEC 2017, 310.120(C), the suffix D indicates two insulated conductors laid parallel within an outer nonmetallic covering, and 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 3 — 2017 National Electrical Code, NFPA – Introduction
Question: Which of the following installations falls within the scope of the Code?
- A. Electrical wiring in railway rolling stock
- B. Trailing cable for mining machinery
- C. Utility warehouse outside a generating plant
- D. Service drops with associated metering equipment
Correct Answer: C
Per NEC 2017, Section 90.2(A)(4), the Code covers installations used by the electric utility — such as office buildings, warehouses, garages, machine shops, and recreational buildings — that are not an integral part of a generating plant, substation, or control center. Service drops and metering under exclusive utility control (90.2(B)(5)), railway rolling stock (90.2(B)(1)), and mining machinery trailing cable (90.2(B)(2)) are all excluded.
Reference: NEC 2017 Section 90.2(A)(4)
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.