Idaho Limited Electrical Water Pump 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
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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
- 226 questions in pool
- Detailed explanations
Texts preferred · 9am–9pm Central
Idaho -Limited Electrical Water Pump Installer 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 Water Pump 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 Calculations.
You have two ways to practice. The free practice exam gives you 10 questions per attempt, and you can retake it as often as you like. The full practice exam gives you 40 questions on a 2 hours clock, with a new draw from our question bank every attempt.
2017 National Electrical Code, NFPA – Introduction 3 items
Our study plan for this topic: Purpose of the NEC: practical safeguarding of persons and property; Scope of NEC coverage: premises, structures, and installation types included; Installations not covered by the NEC (exclusions and exemptions); Code arrangement: role and hierarchy of Chapters 1–9 and informative annexes; Mandatory vs. permissive rules and explanatory material (shall/shall not vs. shall be permitted); Authority having jurisdiction: enforcement, interpretations, and special permission; Equipment examination, listing, and approval for safety; Units of measurement: SI and inch-pound dual system.
2017 National Electrical Code, NFPA – Chapter 1 4 items
Our study plan for this topic: Key NEC definitions and terminology (Article 100 Part I); Equipment approval, listing, and labeling requirements; Electrical connections, splices, and temperature limitations; Working space and clearance requirements around electrical equipment; Guarding of live parts and enclosure type selection; Equipment marking and arc-flash hazard warning labels; Wiring integrity, conductor materials, and conductor sizing; Deteriorating agents and environmental protection of equipment.
2017 National Electrical Code, NFPA – Chapter 2 14 items
Our study plan for this topic: Grounding and bonding requirements for motor-operated water pumps and submersible pumps; Equipment grounding conductor types, sizing, and identification; Grounding electrode system and permitted grounding electrodes; Bonding of piping systems, structural metal, and service equipment; Overcurrent protection for branch circuits and feeders; Branch circuit ratings, conductor sizing, and GFCI protection requirements; Load calculations for branch circuits, feeders, and services; Outside branch circuits and feeders — clearances, disconnecting means, and conductor requirements.
2017 National Electrical Code, NFPA – Chapter 3 8 items
Our study plan for this topic: Conductor ampacity tables and temperature ratings (Article 310); Ampacity correction and adjustment factors for ambient temperature and bundled conductors; Underground installation minimum cover requirements (Table 300.5 and Table 300.50); Wiring method selection, uses permitted, and uses not permitted for conduit types (RMC, IMC, EMT, FMC, LFMC, LFNC, PVC); Securing and supporting requirements for raceways and cables; Box and conduit body fill calculations and sizing (Article 314); Protection of conductors against physical damage (Article 300); Cable type applications: Type MC, NM, UF, SE/USE, and conductor identification and marking.
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 selection and settings for continuous-duty motors (Article 430 Part III); Motor branch-circuit short-circuit and ground-fault protective device ratings (Table 430.52); Motor disconnecting means types, ratings, and location requirements (Article 430 Part IX); Motor controller ratings, marking, and design requirements (Article 430 Part VII); Motor control circuit overcurrent protection and disconnection (Article 430 Part VI); Flexible cord and cable permitted uses, ampacity, and prohibited applications (Article 400); Switch installation, ratings, grounding, and accessibility requirements (Article 404).
2017 National Electrical Code, NFPA Calculations 1 item
Our study plan for this topic: Motor branch-circuit conductor sizing (125% rule for single motors, Article 430.22); Branch-circuit short-circuit and ground-fault protective device ratings for motors (Table 430.52 percentages by motor type and protective device); Full-load current determination from NEC tables (Tables 430.247–430.250) vs. nameplate values; Feeder conductor ampacity for multiple motors (430.24 summation method); Motor overload protection sizing (430.32 trip current percentages by service factor and temperature rise); Feeder overcurrent protection rating for motor loads (430.62 largest branch-circuit device plus sum of other motor FLCs); Branch-circuit load calculations for motor outlets under Article 220 (220.14(C), 220.18(A), 220.50); Locked-rotor current and code letter kVA/hp values (Table 430.7(B) and Tables 430.251(A)/(B)) for disconnecting means sizing.
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: You are installing a single-phase motor on a 115-volt branch circuit in a residential application. The motor is rated ¾ HP. Per NEC 430.7(A)(8), what marking is required on this motor's nameplate regarding locked-rotor characteristics?
- A. Code letter or locked-rotor amperes, since the motor is rated ½ HP or more
- B. Design letter only
- C. No locked-rotor marking is required for single-phase motors
- D. Locked-rotor torque value only
Correct Answer: A
Per NEC 430.7(A)(8), an alternating-current motor rated ½ HP or more shall be marked with the code letter or locked-rotor amperes on the nameplate. Since the ¾ HP motor exceeds the ½ HP threshold, this marking is required.
Reference: NEC 2017 Section 430.7(A)(8)
Sample 3 — 2017 National Electrical Code, NFPA – Chapter 3
Question: Solid aluminum conductors in sizes 8, 10, and 12 AWG used for general wiring must be made of which conductor material?
- A. AA-1350 series electrical grade aluminum alloy
- B. ACSR electrical grade aluminum alloy
- C. AA-6101 series electrical grade aluminum alloy
- D. AA-8000 series electrical grade aluminum alloy
Correct Answer: D
NEC 2017, 310.106(B) requires solid aluminum conductors 8, 10, and 12 AWG to be made of an AA-8000 series electrical grade aluminum alloy conductor material; the same requirement applies to listed stranded aluminum conductors 8 AWG through 1000 kcmil of the marked types.
Reference: NEC 2017 Section 310.106(B)
Treat your first attempt as a checkup, not a verdict. After every attempt, the results page breaks your score down by outline topic, so you can see which topics need work. Compare your score with the real exam's passing score, a minimum score of 70, and keep practicing until you pass consistently.
- Answer what you know first. Go through every question once, answer the ones you know, and bookmark the rest. Our practice exams let you bookmark and come back.
- Come back to your bookmarks. Work them out on your second pass.
- Watch your pace. The real exam works out to about 3 minutes per question.
- Look up every miss. After each attempt, find 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.