Work through the math before the exam clock starts
The Texas Journeyman calculation section gives you 110 minutes for 26 questions. Get faster at choosing a formula, finding the right NEC reference, and checking your units with 208 chapter exercises and two timed calculation mocks.
Each worked answer gives you the NEC section to open, the numbers to use, the unit to write down and a common mistake to watch for. The 2026 NEC exercises use the 8 kVA optional-method threshold and 2 VA per square foot for dwelling general lighting where those rules apply. Finish each chapter with a timed quiz at roughly four minutes per calculation. The printable PDF is US$29 and is available right after checkout.
Build skill, then build speed
- 2026 NEC references with each solution
- 208 chapter exercises, from worked examples to timed quizzes
- 2 × 26 calculation mock questions
- 2 pages of printable formulas
Compare calculation workbooks
Other print calculation workbooks reviewed start at US$43.20 before shipping.
| Compare | This workbook | Holder 2026 Practice Calculations (print) | Tom Henry 2026 Calculations (print) |
|---|---|---|---|
| Price | US$29 | US$48.55 to US$53.95 | US$43.20 to US$48 |
| Delivery | Instant PDF download | Print, shipped | Print, shipped |
| NEC lookup, numbers, units and common errors | Shown in worked answers | Not stated | Not stated |
| Texas calculation pace | Timed quizzes in every chapter and two 26-question mocks at 110 minutes each | Not stated | Not stated |
| 2026 NEC load changes | 8 kVA optional-method threshold and 2 VA per sq ft for dwelling lighting where applicable | Not stated | Not stated |
Try three questions
Solve the problem, then check the arithmetic and the Code reference.
Continuous feeder loads
A feeder carries 18 A continuous and 15 A noncontinuous. No 100%-rated exception or derating applies. Find the minimum required conductor ampacity.
2026 NEC lookup: 215.4(A)(1).
- Continuous portion: 18 A x 1.25 = 22.50 A.
- Add the full 15 A noncontinuous portion.
37.50 A. Do not apply the continuous multiplier to the noncontinuous load.
Transformer primary protection
A balanced three-phase transformer is rated 45 kVA, 480 V line to line on the primary. Find the primary full-load current. Use your calculator’s square root of 3 without rounding it.
2026 NEC lookup: 450.5(B) and Table 450.5(B).
- Convert 45 kVA to 45,000 VA.
- Primary current: 45,000 VA / (sqrt(3) x 480 V) = 54.1266 A.
54.13 A. Do not substitute secondary voltage into the primary calculation.
Box fill
Four insulated 12 AWG conductors enter and terminate in the box. It has one device yoke connected to 12 AWG conductors, one 12 AWG equipment grounding conductor entering the box, and no internal clamps. No other allowances apply. Find the minimum volume.
2026 NEC lookup: 314.16(B)(1), (2), (4), (5) and Table 314.16(B).
- Count four conductor volumes for the insulated conductors, two for the yoke and one for the ground. The total is seven.
- Volume: 7 x 2.25 cu in per 12 AWG equivalent.
15.75 cu in. Do not count a single device yoke as one equivalent.
Questions about the workbook
What do I get after purchase?
You get a printable PDF with 208 chapter exercises, two calculation mocks, worked solutions and a two-page formula sheet.
Is this for the 2026 NEC?
It uses the 2026 NEC. Have your copy open so you can practise finding the references as you solve each problem.
How is this different from a full practice exam?
This workbook drills calculations, Code lookup and units. Use the full-length electrician practice exams when you want to practice the wider exam.
Does it cover Journeyman and Master calculations?
Yes. Each track has a 26-question workbook mock. Texas gives Journeyman candidates 110 minutes for 26 calculation items; the Master workbook mock uses that same practice pace.
Can I bring the formula sheet to the Texas exam?
No. Use the sheet for study. Bring a qualifying soft-bound NEC book and check PSI’s bulletin for exam-day material rules.
Keep preparing
Try the full-length electrician practice exams, the Texas Journeyman exam and license bundle or the electrical materials practice pack. Explore Tsai Electro membership for more learning paths.
NEC® and NFPA 70® are registered trademarks of the National Fire Protection Association. Tsai Electro is not affiliated with NFPA.
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