Daily NEC Code Question
One question a day from the 2026 National Electrical Code, the same question for every reader on the same date. Answer it, read why, and keep the streak going. The bank holds 120 original questions spread across the eight content areas this site builds its practice on.
The Colorado examinations have been written on the 2026 National Electrical Code since 1 August 2026, and the state code went to the 2026 edition on 15 July 2026. This page holds no table values, and the sections it names are the 2026 numbers, which is the book PSI hands you in the room.
The article level moves are concentrated at the two ends of the book: Chapter 1 took in load calculations from Article 220 and energy management from Article 750, and the limited energy and communications material was rebuilt across the 720s. Ampacity, overcurrent, grounding, motors and boxes kept their articles, and Chapter 9 is still the tables.
Five minutes a day beats an hour on Sunday. The point of a daily item is not the one question, it is the habit of opening the code book and finding a section under mild time pressure.
Every question names the section it comes from. Look that section up in your own book before you read the explanation, and the day is worth four times as much.
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One worked question a week, the same style as these
The daily item is one question. The weekly email is one worked all the way through, with the arithmetic shown and a line on each wrong answer naming the mistake that produces it. Unsubscribe in one click.
How the day is picked
The bank is a fixed list of 120 questions in a fixed order. The page counts whole days from 1 September 2026, divides that count by 120 and takes the remainder. That remainder is the question, so the arithmetic gives the same item to everyone reading on the same date with no server involved.
After 120 days the list comes round again. By then the questions you found hard the first time are the ones worth meeting a second time, which is the argument for a fixed order over a random draw.
Progress lives in your browser under a key starting with txee. and nowhere else. A private window, a cleared cache or a different device starts you at zero, and the question of the day is unaffected either way.
The eight content areas
These are the areas the diagnostic on this site scores, and the bank is spread evenly across them. Fifteen questions apiece.
| Content area | Questions |
|---|---|
| Conductor sizing and derating | 15 |
| Raceway and box fill | 15 |
| Load calculations | 15 |
| Motor circuits | 15 |
| Electrical theory | 15 |
| Grounding and bonding | 15 |
| Installation requirements | 15 |
| Licensing, code editions and administration | 15 |
Where the numbers come from
Every section number, table number and figure on this page was checked against the text of the 2026 National Electrical Code before the question was written. A citation that could not be found in that text did not go on the page.
Several sections moved for 2026, and the questions lean on that on purpose. Load calculations left Article 220 for Article 120. The underground cover table is now Table 300.7(A) and free conductor length is now 300.16. Transformer overcurrent protection moved from 450.3 to 450.5. Working from a 2023 book on those items will send you to the wrong page.
The rules are restated in plain words rather than quoted. Read them here, then read the section itself, because the exam is open book and the skill being tested is finding the rule rather than remembering this page.
Questions people ask
Is the daily question the same for everyone?
It is. The question is picked from the bank by the calendar date, so every reader who opens the page on a given day gets the same item. Nothing is drawn at random and nothing is sent to a server, which is why the page keeps working with no network.
Which code edition are the questions written against?
The 2026 National Electrical Code. Every section number on this page was checked against the text of that edition before the question was written. Several of them moved in 2026, so a 2023 book will send you to the wrong place on the load calculation and Article 300 items.
How does the streak work?
Answering on a calendar day adds one to the streak. Miss a day and the streak starts again at one the next time you answer. The longest streak and the number of days played are kept alongside it, and all three live in your own browser.
What happens if I get it wrong?
The explanation appears either way, along with the section the rule comes from and a link to the study page that covers it. A wrong answer still counts as a day played, because showing up daily is the habit the streak is measuring.
Can I go back and do yesterday's question?
Yes. The link under the question loads yesterday's item so you can read it and its explanation. Answering it does not change the streak, since the streak counts the days you turned up rather than the questions you have finished.
Do the questions come from a real exam?
No. They were written for this page, one at a time, from the code text. They are the same shape as the items on an electrician licensing examination and cover the same eight content areas, but no question here is copied from any exam.
The 2023 to 2026 section crosswalk maps every section that moved, both directions, $29 once.
One exam question a week, worked all the way through
One original question in the Colorado style, the arithmetic worked, the code section named, and a short note whenever a Colorado licensing or code rule moves. Unsubscribe in one click.