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.
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.
| Feature | Tsai Electro PDF | Print calculation workbook |
|---|---|---|
| Price | US$29 | US$48.55 listed sale price |
| Questions | 208 + 52 mock questions | 350+ |
| Worked solutions | Yes | Yes, per retailer |
| Code edition | 2026 NEC | 2026 NEC, per retailer |
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 the calculator √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
A box has 4 insulated 12 AWG conductors entering and terminating in the box, 1 device yoke(s) connected to 12 AWG, 1 entering 12 AWG equipment grounds, 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 4 insulated + 2 for yokes + 1 for the equipment grounds + 0 for clamps = 7 equivalents.
- 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.
Which NEC edition does it use?
It uses the 2026 NEC. Have your copy open so you can practise finding the references as you solve each problem.
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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