ICC T16 Master Electrician (2020 NEC) Exam: Step-by-Step Study Guide
Preparing for the ICC T16 Master Electrician (2020 NEC) exam is easier one step at a time. This guide starts with the key facts from the official bulletin, then covers the topics on the exam, the reference books, sample questions with answers, and a simple way to prepare. Pearson VUE gives the exam.
ICC T16 Master Electrician (2020 NEC) Exam Overview
Start with the facts. Here's what the official bulletin says:
| Questions | 100 questions |
| Time limit | 5 hours |
| Passing score | 75% correct |
| Books in the exam room | Open book |
| Exam fee | $120 |
On exam day
- Questions are four-option multiple choice with one correct answer.
- You may bring copyrighted, bound books to the test administration, including those specifically listed as approved references. However, training materials such as presentations, study guides, or practice questions are not permitted. All exam questions are based solely on the approved reference list, and only those references may be used as the basis for appealing exam questions.
References you may bring
- National Electrical Code (NEC) (2020)
- Ugly's Electrical Reference (any edition)
Scheduling, changes and retakes
- Exams are scheduled through PearsonVUE at www.pearsonvue.com/ICC, where candidates can create an account, schedule an exam, locate a test center, purchase vouchers and request accommodations.
- Results for examinations taken electronically are available immediately after the examination is completed.
- You must wait 10 days before retaking a failed exam.
- After passing, contact the jurisdiction in which you wish to be licensed for any other requirements, because ICC is not a licensing agency.
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.
Topics on the ICC T16 Master Electrician (2020 NEC) Exam
Next, the content. The official content outline has 9 topics:
| Topic | Questions | Share of the exam |
|---|---|---|
| General Knowledge | 12 | 12% |
| Services and Service Equipment | 16 | 16% |
| Feeders | 4 | 4% |
| Branch Circuits and Conductors | 16 | 16% |
| Wiring Methods and Materials | 19 | 19% |
| Equipment and Devices | 10 | 10% |
| Control Devices | 3 | 3% |
| Motors and Generators | 8 | 8% |
| Special Occupancies, Equipment, and Conditions | 12 | 12% |
Services and Service Equipment: Services and Fault Current; Service Load Calculations; Service Equipment & Service Conductors; Transformers; System Grounding and Bonding; Temporary Service Wiring; Service Disconnecting Means Requirements and Ratings; Overhead and Underground Service Conductor Installation and Clearances.
Wiring Methods and Materials: Raceway Installations; Underground Wiring Methods; Boxes and Enclosures; Cabinets, Panelboards, & Switchboards; Clearance and Guarding; Flexible Cords and Cables; Cable Types and Their Permitted and Prohibited Uses (NM, MC, AC, MI, TC, SE, UF, and specialty types); Conductor Fill Calculations and Conduit Sizing (Chapter 9 Tables, percent fill, nipple fill).
Special Occupancies, Equipment, and Conditions: 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 (Class I, II, III / Division and Zone Systems).
A Simple Plan to Prepare for the ICC T16 Master Electrician (2020 NEC) Exam
Step one is the books. This is an open-book exam, so the references on the bulletin's list are what you'll work from, while you study and in the exam room. Get the editions the bulletin names.
Step two is learning your way around them. Go through each book's table of contents and index until you know where the major subjects are. You don't need to memorize the books. You need to find things in them.
Step three is marking them up. Highlight the sections you use most. The exam facts above list the bulletin's rules on tabs and markings, so follow them exactly.
Step four is timed practice. Our practice exams run on a clock, so you get used to the real exam's pace: about 3 minutes per question.
The last step is consistency. Keep practicing until you pass several practice exams in a row. That's the signal you're ready.
Reference Books for the ICC T16 Master Electrician (2020 NEC) Exam
The listed references are the 2020 National Electrical Code (NEC) and Ugly's Electrical Reference (any edition).
Where to get them:
On Test Day
Go through the exam at a steady pace. On your first pass, answer the questions you know and bookmark the ones you don't. Every exam lets you come back to bookmarked questions.
On your second pass, return to your bookmarks one at a time. You have 5 hours for 100 questions, which is about 3 minutes per question, so keep moving and don't let one question hold you up. Before you finish, answer anything you skipped. A blank can't earn a point.
Study Tips
On an open-book exam, the winners aren't the smartest people in the room — they're the fastest at finding answers. Buy the required book, practice with it open, and tab and highlight each section the first time a question sends you there. Learn the index and table of contents until you can land on any topic in seconds. That speed is what separates a pass from a fail.
Know your way around each book's index and table of contents. Open-book exams reward speed: you need to find specific items quickly.
On an open-book exam, work through every question once: answer the ones you know and skip the ones you don't. Then go back to the ones you flagged. You can bookmark questions for later review, just like on our exams — and don't sink too much time into any single question. The clock is still running.
Give yourself at least three to six weeks. Use your exam's candidate bulletin as your roadmap for what's tested, and spend your time on finding-it-fast skills over rote memorization. In practice, aim for three clean passes at 80% or higher — setting your practice bar above the real cut score gives you a comfortable margin on test day.
Practicing against a ticking clock is the best way to beat exam-clock anxiety. Use these timed tests to build your pacing, so you learn to move steadily and never burn too long on a single question. By test day, the format feels routine.
This practice exam mirrors the real Pearson VUE exam — the same number of questions, drawn from the same topics. Practicing in that format now means no surprises when you sit for the real thing.
Sample ICC T16 Master Electrician (2020 NEC) Practice Questions
Here are a few questions from our practice question bank, each with its answer and reference.
Sample 1 — General Knowledge
Question: Using Ohm's Law, what is the resistance of a circuit that draws 8 amperes from a 240-volt source?
- A. 20 ohms
- B. 25 ohms
- C. 30 ohms
- D. 35 ohms
Correct Answer: C
According to Ohm's Law, Ohms = Volts ÷ Amperes. Therefore, R = 240V ÷ 8A = 30 ohms.
Reference: Ugly's Electrical References, 2023 ed., Ohm's Law, Page 1 (2020 ed.: Ohm's Law)
Sample 2 — Special Occupancies, Equipment, and Conditions
Question: You are called to install wiring for a new elevator system. The hoistway door interlock conductors need to be connected from the hoistway riser. What minimum temperature rating must these conductors be suitable for?
- A. 60°C (140°F)
- B. 90°C (194°F)
- C. 150°C (302°F)
- D. 200°C (392°F)
Correct Answer: D
Per NEC 620.11(A), conductors to hoistway door interlocks from the hoistway riser shall be flame retardant and suitable for a temperature of not less than 200°C (392°F). Conductors shall be Type SF or equivalent, or physically protected using an approved method that is flame retardant and suitable for not less than 200°C.
Reference: NEC 2020 Section 620.11(A)
Sample 3 — Equipment and Devices
Question: Thermal insulation shall not be installed within what distance of a recessed luminaire's enclosure, wiring compartment, or ballast, unless the luminaire is identified as Type IC?
- A. 25 mm (1 in.)
- B. 50 mm (2 in.)
- C. 75 mm (3 in.)
- D. 100 mm (4 in.)
Correct Answer: C
Per NEC 410.116(B), thermal insulation shall not be installed above a recessed luminaire or within 75 mm (3 in.) of the recessed luminaire's enclosure, wiring compartment, ballast, transformer, LED driver, or power supply unless the luminaire is identified as Type IC.
Reference: NEC 2020 Section 410.116(B)
Sample 4 — Motors and Generators
Question: What is the maximum percentage of motor full-load current for the overload device trip setting on a motor with a marked service factor of 1.15 or greater?
- A. 115%
- B. 125%
- C. 130%
- D. 140%
Correct Answer: B
Per NEC 430.32(A)(1), a separate overload device for a motor with a marked service factor of 1.15 or greater shall be selected to trip or rated at no more than 125 percent of the motor nameplate full-load current rating.
Reference: NEC 2020 Section 430.32(A)(1)
Practicing Online vs. With a PDF
A PDF lets you read questions at your own pace. The real exam runs on a clock. Our practice exams are timed and on a screen, so you practice finding answers with the clock running. Each attempt draws a new set of questions from our bank, and your results show your score by topic, so you always know what to study next.
Your Next Step
Take the free ICC T16 Master Electrician (2020 NEC) practice exam to see where you stand. Then study the topics that need the most attention, one at a time. For the official rules, read the exam bulletin, and see the licensing board's website.