Checked against primary sources 2026-09-05

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NC Electrician Exam Tools: Calculators, Games and Labs

Twenty four tools, free and none of them asking for an account, apart from the seven upper rungs of the calculation ladder, which come with the $79 purchase. Each one shows the working rather than only the answer, because the working is the part that transfers to a paper where calculators are not the point. Their table values were read in the 2026 book, and this page says what that means for a state testing on 2020.

Test yourself: thirty free questions, timed

The eight calculators

Voltage drop calculator. Chapter 9 Table 8 conductor properties built in, with the resistance method and the approximate formula side by side so you can see where they part.

Conduit fill calculator. Chapter 9 Table 1 for the percentages, Table 4 for raceway areas and Table 5 for conductor dimensions, with the fill worked step by step.

Box fill calculator. Every box size in 314.16 and the categories that get counted differently, shown as a count rather than a total you have to trust.

Wire size calculator. Load in, conductor out, with the ampacity, the correction, the adjustment and the termination limit each on its own line.

Ampacity calculator. Correction, adjustment and the termination temperature cap at 110.14(C), in the order the code applies them.

Motor calculator. Full load current, conductor sizing, overload and the short circuit device, each from its own Article 430 table.

Transformer calculator. kVA to amps, primary and secondary, with the overcurrent percentages that sit at 450.5 in the 2026 book and 450.3 in the 2023 edition.

Ohm's law calculator. Any two values give the other two, with the power wheel shown rather than assumed.

The calculator hub lists all eight on one page.

The six games

Ampacity sprint. Table 310.16 against a clock: you are given a conductor and a temperature column and you name the ampacity.

Wire size sprint. The same table in reverse: you are given a load and you name the smallest conductor that carries it.

Which table? Ten prompts a round. Read the job, name the table or section you would open first. Three levels.

Code navigation race. Twenty timed prompts a round: pick the chapter, the article or the section out of four.

Article 100 definitions flashcards. Sixty terms, tap to flip, missed cards come back, plus a timed twenty card sprint.

The calculation ladder. Eight rungs of exam arithmetic in the order they get harder, box fill through tap rules, ten problems each with the working shown. Rung one is free and the other seven come with the $79 purchase that also opens the question bank.

The four hands-on labs

A lab is a page you work rather than read. You drag something, turn something or connect something, and it answers with the number it just changed and the section that governs it.

Conduit bending simulator. Drag the rise and turn the angle dial, and the multiplier, the shrink, the take up and every mark move with it.

Switch wiring lab. Drag conductor ends onto terminals on a three way and four way circuit, flip the switches, and a checker names the section behind each fault.

Box fill lab. Drop conductors, grounds, a device yoke, clamps and fittings into a drawn box and watch the fill rise, with the 314.16 rule on every drop.

Grounding electrode lab. Drag electrodes into the ground, bond them into one system and size the grounding electrode conductor from Table 250.66 and its ceilings.

The labs hub opens all four.

The five drills

Daily question. One original multiple choice question every morning, the same one for everybody, with the worked explanation, the section cited and a streak counter.

Diagnostic. Twenty four questions across the main content areas. It scores every area, orders them worst first and names your two weakest, which is the fastest way to decide what to study.

Article drill. A timed drill on which article governs a question, scored in seconds, because the code half of an open book paper is lost on search time rather than on knowledge.

Spot the violation. Twelve drawn scenes. Click the one thing that is wrong, and every region gets an explanation, including the ones that are fine.

Grounding or bonding sorter. Twenty four items sorted one at a time. Grounding reaches earth, bonding ties metal together, and several things do both.

The eligibility calculator

Hours to exam. Type in the hours you have and it gives you the date you can sit, tied to the rule that sets it.

North Carolina sets a different floor for each classification: at least 3,000 hours with 2,000 primary for Limited and the special restricted classifications, at least 5,750 with 5,000 primary for Intermediate, and at least 9,000 with 8,000 primary for Unlimited. The Board's rules count 2,000 hours as one creditable year.

It is free, it needs no account, and nothing leaves your browser unless you email the result to yourself. The hours page explains the credit percentages behind it.

Which edition these tools hold

The table values in these tools were read in the 2026 National Electrical Code. North Carolina examinations require the 2020 edition, so here is exactly what that does and does not mean.

The table numbers are the same in both editions we hold. Table 310.16 for ampacity, 314.16 for box fill, Table 250.66 for grounding electrode conductors, the Article 430 motor tables and Chapter 9 Tables 1, 4, 5 and 8. Our record of the numbers that moved between the 2023 and 2026 editions has no entry for any of them.

On the values inside the tables we are more careful. We read the 2026 tables and we have not compared them against a 2020 printing row by row, and we hold no crosswalk that reaches back to 2020. Use the tools to learn the method and check any number that decides an answer in the book you are carrying.

Two tools name a section that changed number in the recent editions. The transformer calculator cites transformer overcurrent protection at 450.5 in the 2026 book, which is 450.3 in the 2023 edition. The Ohm's law calculator points at load calculations in Article 120 in the 2026 book, which is Article 220 in the 2023 edition. Which edition is on the exam carries the full list.

How to use them without learning the wrong thing

A calculator that hands you an answer teaches you nothing you can carry into a room where the arithmetic has to come from you. That is why every tool here shows the steps.

Work the problem on paper first, then run it through the tool and compare the steps rather than the totals. A wrong total says something broke. A step by step comparison says which step.

Then log the step you got wrong. Twenty problems logged that way point at your two real weak spots inside a week.

Questions people ask

Are these NC electrician exam tools free?

Yes, all of them, with no account and nothing gated except the seven upper rungs of the calculation ladder, which come with the $79 question bank purchase. Nothing you type leaves your browser.

Can I use a calculator on the North Carolina exam?

The Board's handbook sets the reference and conduct rules for the examination, so read it for what you may bring and ask PSI before your date if anything is unclear. Practice the arithmetic by hand either way.

Which code edition are the tool values from?

The 2026 National Electrical Code. The table numbers match in both editions we hold, but we have not compared the values against a 2020 printing, so check any figure that decides an answer in your own book.

What does the hours calculator do?

It takes the hours you have and gives the date you can sit, against the Board's floors: 3,000 hours with 2,000 primary for Limited and the special restricted classifications, 5,750 with 5,000 for Intermediate, and 9,000 with 8,000 for Unlimited.

Do the labs need anything installed?

No. All four run in the browser, they need no account and nothing is uploaded.

Which tool should I start with?

The diagnostic, because it ranks your areas worst first in twenty four questions. Then work the two weakest areas as topic sets with your code book open.

What this page cites

• NCBEEC Examination Information Handbook The Board's own candidate handbook. Source for the item counts, the time limits, the reference list, the marking rules, the identification rules and the retake wait. Read 5 September 2026. source
• Title 21 NCAC Chapter 18B, the Board's rules The rule set behind the experience hours, the definitions of primary and secondary experience and the minimum grade of 70. Read 5 September 2026. source
• NCBEEC examination application for new applicants The application that sets the age, the character statements and the experience hours for each classification. Read 5 September 2026. source
• NEC 2026 renumbering, article by article Our own record of the article and section numbers that changed address between the 2023 and 2026 editions, each one read in the 2026 text before it went on the list. source
• Office of State Fire Marshal, state electrical code and interpretations The page that marks the 2020 North Carolina Electrical Code as the current code effective 1 November 2021 and the 2023 code as an indefinite delay. Read 5 September 2026. source