ICC T17 Journeyman Electrician Exam (2020 NEC) Practice Exam
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- 240 minute time limit
- 9 topic areas covered
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ICC T17 Journeyman Electrician (2020 NEC) Practice Exam Guide
What's on the exam
Questions per topic, out of 80This practice exam follows the official content outline for the ICC T17 Journeyman Electrician (2020 NEC) exam: General Knowledge, Services and Service Equipment, Feeders, Branch Circuits and Conductors, Wiring Methods and Materials, Equipment and Devices, Control Devices, Motors and Generators, Special Occupancies, Equipment, and Conditions.
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 80 questions on a 4 hours clock, with a new draw from our question bank every attempt.
General Knowledge 5 items
Our study plan for this topic: Electrical Theory and General Electrical Load Calculations; Code Definitions and Terms; Plan Reading; NEC Purpose, Scope, and Code Arrangement (Article 90); General Requirements for Electrical Installations (Article 110); Working Spaces and Clearances Around Electrical Equipment; Conductor Types, Sizes, and Ampacity Ratings; Equipment Approval, Listing, Labeling, and Marking Requirements.
Services and Service Equipment 9 items
The outline lists: Services and Fault Current; Service Load Calculations; Service Equipment & Service Conductors; Transformers; System Grounding and Bonding; Temporary Service Wiring; Service disconnect requirements and ratings (Article 230); Overhead and underground service conductor clearances and installation methods.
Feeders 3 items
Our study plan for this topic: Load Calculations; Equipment Grounding; Feeder conductor minimum ampacity and sizing (NEC 215.2); Overcurrent protection for feeders (NEC 215.3); Ground-fault protection of equipment on feeder disconnects (NEC 215.10); Feeder conductor identification — grounded, ungrounded, and equipment grounding conductors (NEC 215.12); Outside feeder clearances and wiring methods (NEC Article 225); Disconnecting means for buildings supplied by feeders (NEC 225.31–225.34).
Branch Circuits and Conductors 15 items
Our study plan for this topic: Branch Circuit Calculation; Overcurrent Protection; Conductors; Required Outlets & GFCI/AFCI Protection; Equipment Grounding; Conductor Identification (grounded, ungrounded, and equipment grounding conductors); Ampacity Correction and Adjustment Factors (ambient temperature and bundling derating); Voltage Drop Calculations (single-phase and three-phase formulas and NEC recommendations).
Wiring Methods and Materials 21 items
The outline lists: Raceway Installations; Underground Wiring Methods; Boxes and Enclosures; Cabinets, Panelboards, & Switchboards; Clearance and Guarding; Flexible Cords and Cables; Conduit Fill Calculations and Conductor Count Tables; Cable Wiring Methods (NM, AC, MC, MI, SE, UF, TC, FC, FCC).
Equipment and Devices 10 items
Our study plan for this topic: Luminaires; Receptacles, Switches and Other Devices; Appliances and Other Equipment; Other Utilization Equipment; Heating and Cooling Equipment; Fixture Wire Types, Ampacity, and Uses (Article 402); Switch Ratings, Types, and Installation Requirements (Article 404); Receptacle Installation in Damp and Wet Locations.
Control Devices 3 items
Our study plan for this topic: Switches, Disconnects and Controllers; Motor controller ratings and markings (NEC 430.8, 430.83); Motor control circuit overcurrent protection (NEC 430.72); Motor control circuit wiring and disconnection requirements (NEC 430.73–430.75); Disconnecting means types and location requirements for motors and controllers (NEC 430.101–430.113); Motor overload protection devices and settings (NEC 430.32–430.40); Stop-start station and jogging control circuit diagrams; Hand-off-automatic (HOA) control circuits.
Motors and Generators 5 items
Our study plan for this topic: Motors; Generators; Motor branch-circuit conductor sizing (125% rule, single and multiple motors); Motor branch-circuit short-circuit and ground-fault protective device ratings (Table 430.52); Motor overload protection requirements and trip current percentages; Motor disconnecting means requirements and location; Motor controllers: ratings, types, and marking requirements; Locked-rotor current and code letters.
Special Occupancies, Equipment, and Conditions 9 items
The outline lists: Special Occupancies; Swimming Pools and Similar Installations; Mobile Home and RV Parks; Data Processing Equipment; Miscellaneous Special Equipment; Emergency Systems; Signaling and Fire Alarm Systems; Hazardous Location Classification (Classes, Divisions, and Zones).
Sample 1 — Wiring Methods and Materials
Question: What is the ampacity rating basis for Type UF cable?
- A. 75°C (167°F) conductors
- B. 90°C (194°F) conductors
- C. 60°C (140°F) conductors
- D. 105°C (221°F) conductors
Correct Answer: C
Per NEC 340.80, the ampacity of Type UF cable shall be that of 60°C (140°F) conductors in accordance with 310.14.
Reference: NEC 2020 Section 340.80
Sample 2 — Branch Circuits and Conductors
Question: You are a master electrician installing a new 200-ampere service for a single-family dwelling using a single-phase, 120/240-volt system. The homeowner asks if the service conductors can be smaller than 200-ampere rated conductors. According to the NEC, what is the minimum ampacity the service conductors must have?
- A. 200 amperes (100 percent of the service rating)
- B. 180 amperes (90 percent of the service rating)
- C. 166 amperes (83 percent of the service rating)
- D. 160 amperes (80 percent of the service rating)
Correct Answer: C
Per NEC 310.12(A), for a service rated 100 through 400 amperes supplying the entire load of a one-family dwelling on a single-phase, 120/240-volt system, the service conductors shall be permitted to have an ampacity not less than 83 percent of the service rating. For a 200-ampere service, that is 200 × 0.83 = 166 amperes.
Reference: NEC 2020 Section 310.12(A)
Sample 3 — Equipment and Devices
Question: What is the maximum output voltage permitted for the secondary winding of an isolation transformer connected to an impedance heating system for fixed outdoor electric deicing and snow-melting equipment?
- A. 60 volts ac
- B. 80 volts ac
- C. 30 volts ac
- D. 15 volts ac
Correct Answer: C
Per NEC 426.32, the secondary winding of the isolation transformer connected to the impedance heating elements shall not have an output voltage greater than 30 volts ac.
Reference: NEC 2020 Section 426.32
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, 70% correct, 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 | 80 questions |
| Time limit | 4 hours |
| Passing score | 70% correct |
| Books in the exam room | Open book |
| Exam fee | $120 |
- Results for examinations taken electronically are available immediately after the examination is completed.
- You must wait 10 days before retaking a failed exam.
Source: National Contractor/Trades Examination Information Bulletin, PUBLISHED June 30, 2026; ICC Exam Catalog, checked September 27, 2026. Check the bulletin before test day: fees and rules can change.