ICC G16 Master Electrician Exam (2017 NEC) 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 Pearson VUE test format.
- 100 questions (same as real exam)
- 300 minute time limit
- 9 topic areas covered
- 446 questions in pool
- Detailed explanations
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ICC G16 Master Electrician (2017 NEC) Practice Exam Guide
What's on the exam
Questions per topic, out of 100This practice exam follows the official content outline for the ICC G16 Master Electrician (2017 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 100 questions on a 5 hours clock, with a new draw from our question bank every attempt.
General Knowledge 12 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; Equipment Approval, Listing, and Labeling Requirements; General Installation Requirements (Article 110); Working Space and Clearances Around Electrical Equipment; Conductor Materials, Sizes, and Temperature Ratings.
Services and Service Equipment 16 items
The outline lists: Services and Fault Current; Service Load Calculations; Service Equipment & Service Conductors; Transformers; System Grounding and Bonding; Temporary Service Wiring; Service entrance conductor installation methods and clearances; Service disconnecting means requirements and ratings.
Feeders 4 items
Our study plan for this topic: Load Calculations; Equipment Grounding; Feeder conductor sizing and ampacity requirements; Overcurrent protection for feeders; Feeder neutral load calculations and demand factors; Outside feeders: clearances, conductor sizing, and disconnecting means; Demand factors for dwelling and non-dwelling feeder loads; Ground-fault protection of equipment for feeders.
Branch Circuits and Conductors 16 items
Our study plan for this topic: Branch Circuit Calculation; Overcurrent Protection; Conductors; Required Outlets & GFCI/AFCI Protection; Equipment Grounding; Voltage Drop Calculations (Single-Phase and Three-Phase); Conductor Insulation Types and Application Environments; Ampacity Correction and Adjustment Factors.
Wiring Methods and Materials 19 items
The outline lists: Raceway Installations; Underground Wiring Methods; Boxes and Enclosures; Cabinets, Panelboards, & Switchboards; Clearance and Guarding; Flexible Cords and Cables; Cable Wiring Methods (NM, AC, MC, MI, SE, UF, TC, MV, FCC, FC, IGS cable types); Conduit and Tubing Types (RMC, IMC, EMT, FMC, LFMC, PVC, HDPE, RTRC, ENT, LFNC, FMT).
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 Installation Requirements; NEMA Receptacle and Plug Configurations; Lighting Track Installation and Construction Requirements.
Control Devices 3 items
Our study plan for this topic: Switches, Disconnects and Controllers; Motor controller ratings and markings (horsepower, voltage, short-circuit current); Motor control circuit overcurrent protection and wiring (Article 430 Part VI); Motor disconnecting means types, location, and ampere ratings; Motor control center construction, overcurrent protection, and grounding; Class 1, Class 2, and Class 3 remote-control circuit classifications and power source requirements; Stop-start station wiring and control relay circuits (jogging, hand-off-automatic); Industrial control panel overcurrent protection, short-circuit current rating, and disconnecting means.
Motors and Generators 8 items
Our study plan for this topic: Motors; Generators; Motor branch-circuit conductor sizing (125% FLC rule); Motor branch-circuit short-circuit and ground-fault protection (Table 430.52); Motor overload protection (sizing and placement of overload devices); Motor disconnecting means (type, location, and rating requirements); Motor controllers (ratings, types, and design requirements); Motor control centers (overcurrent protection, grounding, and busbar requirements).
Special Occupancies, Equipment, and Conditions 12 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 (Classified) Locations — Class I, II, and III Division and Zone Classification.
Sample 1 — Wiring Methods and Materials
Question: You are installing a new panelboard in a residential garage. The homeowner has stacked storage boxes in front of the planned installation location. What is the minimum working space width required in front of the panelboard?
- A. 24 inches (610 mm)
- B. 30 inches (762 mm)
- C. 36 inches (914 mm)
- D. 42 inches (1067 mm)
Correct Answer: B
Per NEC 110.26(A)(2), the width of the working space in front of electrical equipment shall not be less than 30 inches (762 mm). Additionally, per NEC 110.26(B), working space required by this section shall not be used for storage. The homeowner's boxes would need to be removed.
Reference: NEC 2017 Section 110.26(A) and (B)
Sample 2 — Services and Service Equipment
Question: For track lighting in other than dwelling units, an additional load of 150 volt-amperes shall be included for every ______ of lighting track or fraction thereof when calculating feeder and service loads.
- A. 1 ft
- B. 4 ft
- C. 5 ft
- D. 2 ft
Correct Answer: D
Per NEC 220.43(B), for track lighting in other than dwelling units or guest rooms/suites of hotels or motels, an additional load of 150 volt-amperes shall be included for every 2 ft (600 mm) of lighting track or fraction thereof.
Reference: NEC 2017 Section 220.43(B)
Sample 3 — Branch Circuits and Conductors
Question: What is the minimum copper service-entrance conductor size for a 200 A, 120/240-volt, single-phase service to a one-family dwelling, using THHN conductors with 75°C terminals?
- A. 2/0 AWG
- B. 3/0 AWG
- C. 250 kcmil
- D. 300 kcmil
Correct Answer: A
For a 120/240-volt, single-phase service supplying the entire load of a one-family dwelling, 310.12(A) (310.15(B)(7) in NEC 2017) permits service conductors with an ampacity of not less than 83 percent of the service rating: 200 A x 0.83 = 166 A. In the 75°C column of Table 310.16, 2/0 AWG copper is rated 175 A, so 2/0 AWG is the minimum. Without that dwelling allowance, 3/0 AWG copper (rated 200 A) would be required.
Reference: NEC 2017 Section 310.15(B)(7) and Table 310.15(B)(16)
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, 75% 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 | 100 questions |
| Time limit | 5 hours |
| Passing score | 75% 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.