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Checked against primary sources 2026-09-07

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Colorado Electrician Exam Tools: Calculators and Drills

These are the pages you work rather than read, and each one shows its steps instead of handing you a total. The table values in them were read in the 2026 National Electrical Code, which is the edition Colorado examinations have run on since August 1, 2026, so the tool and the paper agree for once.

Test yourself: thirty free questions, timed

On this page
  1. The eight calculators
  2. The six games
  3. The four hands-on labs
  4. The drills, which matter more in Colorado
  5. The eligibility calculator
  6. Which edition these tools hold
  7. What the Colorado exam room does to your practice
  8. How to use them without learning the wrong thing
  9. Questions people ask
  10. What this page cites

The eight calculators

Voltage drop calculator. The resistance method and the approximate formula side by side, so you can see where they part.

Conduit fill calculator. The Chapter 9 tables for the fill percentages, the raceway areas and the conductor dimensions, worked step by step.

Box fill calculator. Every box size, with the items 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 temperature limit each on its own line.

Ampacity calculator. Correction and adjustment applied in the order the code applies them, with the termination cap shown rather than hidden.

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

Transformer calculator. Rating to amps, primary and secondary, with the overcurrent percentages worked out.

Ohms law calculator. The four quantities, solved from any two, with the power wheel shown rather than assumed.

The calculator index lists all eight on one page.

The six games

Ampacity sprint. The ampacity table 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: a load, and 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, picking the chapter, the article or the section out of four.

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

Grounding or bonding sorter. Twenty four items sorted one at a time. Grounding and bonding is the first competency the Board names in its own continuing education list, and it is the pair this trade mixes up.

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 rule 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 rule behind each fault.

Box fill lab. Drop conductors, grounds, a device yoke, clamps and fittings into a drawn box and watch the fill rise.

Grounding electrode lab. Drag electrodes into the ground, bond them into one system and size the grounding electrode conductor.

The labs index opens all four.

The drills, which matter more in Colorado

These are the ones built for a book you have never opened, which is the book Colorado puts in front of you.

Article drill. A timed drill on which article governs a question, scored in seconds, because 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.

Diagnostic. Twenty four questions across the main subjects, scored by subject and ordered worst first.

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

Calculation ladder. Eight rungs of exam arithmetic in the order they get harder, ten problems each with the working shown. Rung one is free and works with no network, and the other seven come with the $79 purchase.

The eligibility calculator

Hours to exam. Put in the hours you have and it checks them against the rule that decides.

Colorado counts hours and years together, so the tool checks both. The Board asks a journeyman applicant for 8,000 hours of experience earned in no less than 4 years, with 2,000 of those hours in commercial or industrial work, plus 288 hours of classroom education required for all applicants with no grandfathering. A residential wireman needs 4,000 hours of residential only experience earned in no less than 2 years. A master electrician needs 10,000 hours earned in no less than 5 years, or one of the three other routes on the Board's page.

One thing the tool cannot settle for you. The statute places the 288 classroom hours in the last eight years of your training or experience and the Board's rule says the last four years of apprenticeship, so it flags the conflict rather than picking a side. The hours page prints both.

It is free, it needs no account, and nothing leaves your browser unless you email the result to yourself.

Which edition these tools hold

The table values in these tools were read in the 2026 National Electrical Code.

That is the edition Colorado tests on. PSI's bulletin says that effective 8/1/2026, all examination questions are consistent with the 2026 National Electrical Code book, and the state electrical code itself moved to the 2026 edition on July 15, 2026 under Secretary of State rule filing 2026-00171. So the numbering in these tools matches the numbering in the book PSI hands you.

If your own copy at home is a 2023 book, work by subject rather than by number. We do not publish an article by article list of what moved between the two editions, because our Colorado source file holds no such comparison and we will not print one we cannot cite. The edition change page explains that decision.

We cite sections and describe what a rule covers. We do not reproduce National Electrical Code text and we do not reproduce its tables, here or anywhere else on this site. Check any number that decides an answer in your own copy.

What the Colorado exam room does to your practice

PSI provides the code book and a Formula Page at the test center. Its bulletin then says you may not write, highlight, underline, and/or index on the references, and that you may not use any other materials.

So there is no book to bring and no book to tab. The copy on the desk is clean, unfamiliar and the only one in the room, and the Formula Page beside it is the only other reference.

That changes which tools earn your time. A tabbed book is a personal index, and without one the index has to be in your head: which chapter holds a subject, which article inside it, and which heading to read first. The article drill, which table and the code navigation race are the three built for that, and all three are free.

The clock makes the same point. Ninety scored items in 240 minutes is two minutes forty seconds a question, which is comfortable for a rule you can find and hopeless for one you have to hunt. The book rules page has the full quote.

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, which matters here because a Colorado result letter comes back as one word. Board rule 3 CCR 710-1.8.C gives results in a pass or fail format and says they will not be given in any other manner, and rule 1.8.D says examinations are not subject to review by candidates.

On what you may carry into the room, the only sentence we can quote is the bulletin's bar on other materials. If you plan to bring anything at all beyond identification, ask PSI before the day rather than the proctor at the door.

Questions people ask

Are these Colorado electrician exam tools free?

The calculators, games, labs, drills and the eligibility calculator are free and need no account. The full question bank is $79 once, and that same payment opens the seven paid rungs of the calculation ladder.

Which code edition are the tool values from?

The 2026 National Electrical Code, which is the edition Colorado examination questions have followed since August 1, 2026 and the edition the state code moved to on July 15, 2026.

Can I use these calculators in the Colorado exam?

No. PSI supplies the code book and a Formula Page and its bulletin says you may not use any other materials. If you plan to bring anything beyond identification, ask PSI before your date.

Which tool helps most for a Colorado paper?

The navigation drills, because PSI hands you a book you have never marked. The article drill, which table and the code navigation race all train the lookup rather than the recall.

What does the hours calculator check?

The Board's figures: 8,000 hours in no less than 4 years with 2,000 commercial or industrial hours and 288 classroom hours for journeyman, 4,000 hours in no less than 2 years for residential wireman, and 10,000 hours in no less than 5 years or one of three other routes for master.

Do these tools reproduce the code?

No. They cite sections and describe what a rule covers, and they do not reproduce National Electrical Code text or tables. Check any number that decides an answer in your own copy.

Put it to the test

Thirty free questions, timed, with the working shown

Every miss comes back with the arithmetic worked out and the code section named, so you learn the trap and not just the answer. No account.

Start the free practice testSee the $79 question bank

All questions here are original. They are not actual exam questions, and no question bank can promise you a pass.

What this page cites

If your notes still say 2023

The 2023 to 2026 section crosswalk maps every section that moved, both directions, $29 once.

NEC and National Electrical Code are registered trademarks of the National Fire Protection Association.

Trojan Digital Marketing is an independent company. We are not affiliated with, endorsed by, or sponsored by NFPA, the Colorado State Electrical Board, PSI, or any licensing authority, school or union.

The Colorado examinations are open book only in the sense that PSI puts a book on the desk. PSI provides the National Electrical Code and a formula page at the test center, bars writing, highlighting, underlining and indexing on them, and allows no other materials. The questions have followed the 2026 edition since 1 August 2026, and the 2023 book is provided on request until 1 November 2026.

All practice questions are original. They are not actual exam questions.

Built and maintained by Jeff Clerisier, Trojan Digital Marketing.

Every rule here is cited to the section it comes from, and corrections are logged in public with the date. This is study material rather than electrical advice, and it does not replace your own code book or your inspector.

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