Checked against primary sources 2026-08-24

Six things to practice on, five of them free end to end

The examination is open book and scored against the clock, so the thing worth practicing is not recall. It is how fast you find a rule and how reliably you apply it once you have. Nothing here asks for an account or an email address.

Hands-on labs

Four pages you work rather than read. Drag, turn or connect something and the page answers with the number it changed and the code section behind it. Free, no account, and all four are listed together on the labs page.

• LabConduit Bending Simulator - Offsets, Saddles and 90s

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

• Lab3-Way and 4-Way Switch Wiring Lab - Drag the Wires

  Drag conductor ends onto terminals, flip the switches, and a checker names the 2026 NEC section behind each fault.

• LabBox Fill Lab - Drop Conductors in a Box and Watch It Fill

  Drag conductors, grounds, a device yoke, clamps and fittings into a drawn box and watch it fill.

• LabGrounding Electrode System Lab - Build It and Size the GEC

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

Open the labs

What each one is for

• Start hereWhich areas are you weakest in?

  Twenty four questions, three in each of the eight content areas. It scores every area, orders them worst first, names the two weakest and links the page here that covers each of them. Then it offers a retry on just those two, from questions you have not been served. It also says on the page how much three questions can and cannot tell you, which is less than most people assume.

• Timed paperThe practice exam

  Two modes. Simulation is mixed to the published blueprint, 24 calculation items in every 80 scored, clocked at the per-item pace of the portion each question came from and withholding every answer until you submit. Practice mode leans the other way, harder on calculations than the real paper, and explains each question the moment you answer it. Thirty questions are free; the full bank of 500 is the one paid thing here.

• SpeedWhere does it live?

  A question in exam wording, four article numbers, one right. Forty-six of them, scored in seconds. Some of the wrong options are articles that no longer exist, which is the mistake worth making here rather than at the desk.

• DrawingsSpot the violation

  Twelve drawn scenes, twelve rules, one thing wrong in each. Click it. All 56 clickable regions carry an explanation, so a wrong click tells you why it looked tempting and what the rule actually says.

• MethodFour calculators that show their working

  Derating, box fill, voltage drop, and the power wheel. The first three ask you to type in values you read out of your own book, and each field names the table it wants. The power wheel asks for nothing but volts, amps, ohms and watts. What all four supply is the order of operations, which is where the marks go.

• QuestionsPractice questions by topic

  Fifty-four topics, twenty-five original questions each, 1,350 in all, every answer cited to the 2026 section it comes from. Answer on the page, read the explanation on every miss, then take the timed paper.

• FieldWire size calculator

  Load, continuous or not, termination rating, ambient and conductor count in; the smallest Table 310.16 size, the device and the grounding conductor out, every step shown.

• FieldAmpacity calculator

  The derating chain with the factors built in: table ampacity, ambient correction, conductor count adjustment, the termination cap and the small conductor rule.

• FieldMotor calculator

  Table full load current, conductors at 125 percent, overload from the nameplate, and the largest branch-circuit device for each of the four device types, with the rounding rule.

• FieldTransformer calculator

  kVA to primary and secondary amps, primary only and primary plus secondary protection under 450.5(B), and the secondary conductor sized to the device.

• TheoryOhm's law calculator

  Any two of volts, amps, ohms and watts give the other two, single-phase and three-phase power with power factor, and a series and parallel resistance helper.

• GameWire size sprint

  Table 310.16 in reverse: a load, a material and a column, pick the smallest size that carries it, with the small conductor cap in play. Timed, with records.

• GameCode navigation race

  Twenty exam-worded prompts, pick the chapter, the article or the section against the clock. The code half of the paper is lost on search time, and this trains exactly that.

• GameDefinitions flashcards

  Sixty Article 100 terms, explained the way a journeyman explains them to an apprentice, with a spaced repetition queue and a twenty card sprint.

• GameWhich table?

  A job in exam wording, four tables or sections, pick the one you open. Forty-four tables and sections, 135 prompts, three levels.

• DailyDaily NEC code question

  One original question a day, the same one for everyone, with the worked explanation and the section it comes from. A streak counter, a best streak, and a share line for the crew. Free, no account.

• GameAmpacity sprint

  Ten Table 310.16 prompts against the clock: size, material and column, four ampere options. Copper, aluminum, or mixed with the 240.4(D) cap applied. Best score and best time kept on your phone.

• LadderCalculation ladder

  Eight rungs in the order the exam gets harder, box fill through tap rules, ten problems each with the working shown. Rung one is free. The other seven open with the same purchase as the question bank.

• FieldVoltage drop calculator

  Chapter 9 Table 8 is built in. Pick the size, the material and the system, enter the amps and the one way length, and read the volts dropped and the percent. It also runs the K factor method the exam uses, and it can size the conductor for a percent you name.

• FieldConduit fill calculator

  Tables 4 and 5 are built in. Add up to six rows of conductors, pick the raceway, and get the fill percent, pass or fail, and the smallest trade size that fits. The other mode prints how many of one conductor fit in every size, which is the Annex C question.

• FieldBox fill calculator

  Every box in Table 314.16(A) and every allowance in 314.16(B). Count what enters the box, tick the clamps and the yokes, and read the required volume against the box, with the grounding conductor rule applied the way the 2026 edition writes it.

• ConceptsGrounding, bonding, or both

  Twenty-four items, three buckets, and four of the items belong in both. The most confused pair of ideas in the trade, and every explanation names the section it rests on.

Why the calculators make you type the table values in

The obvious design is to put the code tables inside the tool. Type a wire size, get an ampacity. That is convenient and we are not going to do it, for a reason worth stating plainly rather than burying.

A calculator with the tables inside it is a republication of the tables with a form on the front. The tables belong to NFPA. Not being challenged over something is not the same as being entitled to do it.

There is also a study argument, and it happens to point the same way. The lookup is not what candidates fail. The sequence is: which correction applies before which adjustment, which limit overrides the answer you just calculated, when the termination temperature caps a figure you worked out correctly. Typing the value in from your own book is the part you will be doing in the examination room anyway.

What costs money, and what does not

The diagnostic, the drill, the drawn scenes, the calculators and the sorter are free end to end, forever, with nothing held back. There is no account behind any of them and no email address is asked for or stored anywhere on this site.

The diagnostic ships 48 of the bank inside its own page and never calls out to anything, so it works on a train and it works on the morning our functions are misconfigured. Thirty of those 48 are the same questions the practice exam gives away, which is deliberate: it keeps the total given away near 50 rather than near 80.

The practice exam is the exception and it is worth being exact about. Thirty questions ship inside the page, spread across all eight content areas, weighted the way the real paper is weighted, and carrying the same worked explanations as everything else. They work with no network and no payment. The rest of the bank, 470 more questions, unlocks once for $79. That is the only thing on this estate you can buy.

What the 148 are

Every one of them carries the arithmetic worked out rather than an answer letter: which factor applies before which, where the value came from, and why the final figure rounds the way it does. Behind those sit 534 lines explaining wrong options, one for each wrong option in the bank, and each one names the specific error that produces exactly that number. 83 of the 178 come from the calculation areas and 95 from the knowledge areas, across 8 content areas and four difficulty bands.

The price is worth holding against the retake fee rather than against other study material. TDLR recorded 1,301 passes on 6,328 attempts at the journeyman calculations portion in fiscal 2025, which is 20.56 percent, and a failed portion is rebooked at $78. Forty-nine dollars, once, is less than one retake, and the point of it is to move the failure to a desk where the reason is attached to it.

One payment and nothing after it. No subscription, no account, no password, and no mailing list, so there is no address here for anybody to lose. Stripe takes the payment and sends the receipt, and what comes back to the browser is a token saying a payment happened and nothing else, which is why a cleared browser needs the receipt to get back in.

If it is not what this page describes, write through the contact page inside ninety days of the payment, quote the Stripe receipt, and the money goes back to the card. No reason needed. Whatever has already loaded stays on your machine, because there is no account to close and no way for us to reach in and take it, which is the same reason we cannot tell whether you used any of it.

And it is one bank for two licenses. The master paper is a knowledge portion and a calculations portion as well, sat against the same book, so these 500 questions are the ones to come back to for it. What the bank is not is master-weighted: the simulation mixes to the journeyman blueprint, because that is the one with published item counts behind it.

What none of these do

None of them reproduces a code table, a table row, or the text of a rule. Where a number comes out of the book, you supply it.

None of them is a substitute for the book. The examination is open book, you bring your own, and every one of these tools assumes it is open in front of you.

None of them is a prediction of your result. They are practice, and the only thing they measure is how you did on the questions in front of you.

None of these questions came off a real paper. PSI does not publish its items, and anybody selling you the actual examination is selling you something they should not have. These are written against the same published blueprint the real one is built to.

And none of it is a course, a video, a mentor, or a pass promised in advance. It is a bank of questions with the working shown, and a price.

What this page cites

• NEC 90.3 How the code is arranged, which is what the drill and the calculators both assume you can navigate. source
• TDLR electrician examination statistics, FY2025 Journeyman calculations passed 1,301 of 6,328, which is 20.56 percent. Journeyman knowledge passed 1,402 of 5,731, 24.46 percent. Read 24 August 2026. source
• PSI Candidate Information Bulletin, updated 9 July 2026 Item counts and minutes for both portions, the $78 fee covering both, and the retake of a single failed portion at the same fee. source