Idaho Limited Electrical Well Driller 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
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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
- 227 questions in pool
- Detailed explanations
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Idaho Limited Electrical Well Driller Practice Exam Guide
What's on the exam
Questions per topic, out of 40This practice exam follows the official content outline for the Idaho Limited Electrical Well Driller 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 Calculations.
You can practice two ways. The free practice exam gives you 10 questions per attempt, and you can retake it whenever you like. The full practice exam gives you 40 questions on a 2 hours clock, with a new draw from our question bank each attempt.
2017 National Electrical Code, NFPA – Introduction 3 items
Our study plan for this topic: Purpose and scope of the NEC (practical safeguarding of persons and property); What installations are covered and not covered under NEC scope (90.2); Code arrangement and chapter organization (Chapters 1–9, annexes); Authority having jurisdiction (AHJ) roles, enforcement, and special permissions; Mandatory vs. permissive rules and explanatory material (shall/shall not vs. shall be permitted); Equipment examination, listing, and approval for safety (90.7); Wiring planning for future expansion and circuit limitations in enclosures (90.8); Units of measurement: SI and inch-pound dual system (90.9).
2017 National Electrical Code, NFPA – Chapter 1 4 items
Our study plan for this topic: Key NEC definitions (Article 100 terms: grounded, bonded, ampacity, overcurrent, service, feeder, branch circuit); Equipment approval, listing, and labeling requirements; Examination and identification criteria for electrical equipment (110.3); Electrical connections: terminals, splices, and conductor temperature limitations; Working space and clearances around electrical equipment (110.26); Guarding of live parts and arc-flash hazard warning requirements; Enclosure type selection (Table 110.28 indoor/outdoor ratings); Wiring integrity, conductor materials, and interrupting ratings.
2017 National Electrical Code, NFPA – Chapter 2 14 items
Our study plan for this topic: Grounding and bonding requirements for grounded and ungrounded AC systems (Article 250); Grounding electrode system types, installation, and sizing (250.50–250.70); Equipment grounding conductors: types, sizing, and identification (250.118–250.122); Bonding of services, piping systems, and structural metal (250.90–250.106); GFCI and AFCI protection requirements for branch circuits (Article 210); Branch-circuit ratings, conductor sizing, and overcurrent protection (Articles 210 and 240); Branch-circuit, feeder, and service load calculations including demand factors (Article 220); Outside branch circuits and feeders: clearances, disconnecting means, and wiring methods (Article 225).
2017 National Electrical Code, NFPA – Chapter 3 8 items
Our study plan for this topic: Conductor ampacity tables and adjustment factors (Art. 310); Wiring method installation requirements and physical protection (Art. 300); Underground installation cover requirements and burial depth (Art. 300/310); Box and conduit body fill calculations and sizing (Art. 314); Conduit types, uses permitted, and securing/supporting requirements (RMC, IMC, EMT, PVC, FMC, LFMC, LFNC); Cable types, uses permitted, and installation requirements (NM, MC, SE, USE, UF); Conductor identification, marking, and insulation type designations (Art. 310); Cabinet and enclosure wiring space, deflection, and wire-bending requirements (Art. 312).
2017 National Electrical Code, NFPA – Chapter 4 10 items
Our study plan for this topic: Motor branch-circuit conductor sizing and ampacity requirements (Article 430, Part II); Motor overload protection devices and trip current settings (Article 430, Part III); Motor branch-circuit short-circuit and ground-fault protective device ratings and Table 430.52; Motor disconnecting means types, location, and ampere rating requirements (Article 430, Part IX); Motor controller ratings, marking, and design requirements (Article 430, Part VII); Flexible cord and cable permitted uses, prohibited uses, and ampacity tables (Article 400); Switch installation, ratings, grounding, and accessibility requirements (Article 404); Industrial control panel conductor sizing, overcurrent protection, short-circuit current rating, and marking (Article 409).
2017 National Electrical Code, NFPA Calculations 1 item
Our study plan for this topic: Motor branch-circuit conductor ampacity calculations (Article 430.22, 430.24); Motor branch-circuit short-circuit and ground-fault protective device ratings (Table 430.52); Motor overload protection sizing and trip current percentages (Article 430.32); Full-load current determination from NEC motor tables (Tables 430.247–430.250); Feeder conductor ampacity and protective device ratings for multiple motors (Articles 430.24, 430.62); Branch-circuit and feeder load calculations for general lighting and occupancy loads (Article 220, Table 220.12); Demand factors for feeder and service load calculations (Tables 220.42, 220.54, 220.55, 220.84); Conduit fill calculations using Chapter 9 tables (Table 1, Table 4, Table 5).
Sample 1 — 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 2 — 2017 National Electrical Code, NFPA – Chapter 4
Question: Exposed live parts of motors and controllers operating at 50 volts or more between terminals may be guarded against accidental contact by elevation. What is the minimum height above the floor required?
- A. 2.5 m (8 ft)
- B. 1.8 m (6 ft)
- C. 3.0 m (10 ft)
- D. 2.1 m (7 ft)
Correct Answer: A
NEC 2017, 430.232(3) permits guarding by elevation of 2.5 m (8 ft) or more above the floor, in addition to the options of installation in a room accessible only to qualified persons or on a suitable elevated balcony, gallery, or platform.
Reference: NEC 2017 Section 430.232
Sample 3 — 2017 National Electrical Code, NFPA – Chapter 3
Question: According to the NEC, what is the maximum number of quarter bends (in degrees total) permitted between pull points in a run of Rigid Metal Conduit (RMC)?
- A. 180 degrees
- B. 270 degrees
- C. 360 degrees
- D. 90 degrees
Correct Answer: C
According to the National Electrical Code Handbook, Article 344.26 (Page 335), there shall not be more than the equivalent of four quarter bends (360 degrees total) between pull points, for example, conduit bodies and boxes.
Reference: NEC 2017 Section 344.26
Your first attempt tells you where you're starting from. After every attempt, the results page shows your score for each outline topic, so you can see what to study next. Compare your score with the real exam's passing score, a minimum score of 70, and keep going until you pass consistently.
- Answer the questions you know first, and bookmark the rest. Our practice exams let you bookmark and come back.
- Return to your bookmarks on the second pass.
- Keep a steady pace. The real exam works out to about 3 minutes per question.
- After each attempt, look up each missed question's reference 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.