Texas Master · 2026 NEC
Can you explain every demand factor in your service calculation?
Practice the setup, inspect the worked answer, and find the step you missed before you repeat it in a timed mock.
- 450practice questions
- 204paperback pages
- 2026 NECreference edition
Built for a complete study session
Topic practice and two two-part mock exams give you room to attempt questions, check your reasoning and return to weak areas. Keep a separate error log: lookup, setup, arithmetic or misread detail.
This is a fit if…
- You are preparing for the Texas Master exam and its reference edition matches this workbook.
- You want to work problems alongside your own code book, then review the reasoning.
- You want structured practice rather than an unexplained answer list.
Choose something else if…
You need another state, another license level or a different code edition. This workbook is not an official code book or a replacement for required training.
Texas Master — 2026 NEC
Chapter 4, 1. Dwelling service or feeder load, standard method
Givens
- Dwelling area: 2,000 ft2
- General lighting and general-use receptacle unit load: 2 VA/ft2 under 120.41
- Two small-appliance circuits: 1,500 VA each
- One laundry circuit: 1,500 VA
- Dishwasher: nameplate 1,200 W, used as 1,200 VA
- Disposal: nameplate 900 W, used as 900 VA
- Water heater: nameplate 4,500 W, used as 4,500 VA
- Trash compactor: nameplate 800 W, used as 800 VA
- Dryer: 5,000 VA
- Larger of heating or air-conditioning: 8,000 VA
- 120/240 V, single phase
The four named appliances are each at least 500 W, are fastened in place, share the same service, and are not fixed cooking equipment, a dryer, space heating, air-conditioning equipment, or EVSE. Section 120.53 permits the 75% factor. The watt ratings are used as VA for this example.
Full worked answer
- General lighting = 2,000 ft2 x 2 VA/ft2 = 4,000 VA.
- General connected load = 4,000 + 3,000 + 1,500 = 8,500 VA.
- Table 120.45 demand = 3,000 + (8,500 – 3,000) x 0.35 = 4,925 VA.
- Appliance total = 1,200 + 900 + 4,500 + 800 = 7,400 VA.
- Appliance demand = 7,400 x 0.75 = 5,550 VA.
- Total = 4,925 + 5,550 + 5,000 + 8,000 = 23,475 VA.
- Current = 23,475 / 240 = 97.8125 A.
Answer: 23,475 VA, or 97.8 A. Do not use the separate branch-circuit unit load for this service or feeder calculation.
Code verification: 120.41 supplies 2 VA/ft2. Table 120.45 supplies the general-load demand factors. Sections 120.52, 120.53, 120.54, and 120.60 control the other stated inputs.
The tempting shortcut: 35% of everything
Multiplying the entire 8,500 VA lighting-and-circuit load by 35% gives 2,975 VA. It drops the first 3,000 VA that this example keeps at 100%. The correct lighting-and-circuit demand is 4,925 VA; it is only one part of the complete 23,475 VA service example.
Before you buy: six straight answers
Which book should I buy?
Match the exact exam first: Texas Journeyman, Texas Master or California General Electrician. The Texas books use the 2026 NEC; the California book uses the 2023 NEC. You do not need all three. Confirm the current reference list with your exam provider before ordering.
What makes this useful beyond a list of questions?
You can inspect complete worked samples below: the givens, setup, calculation and reason an attractive wrong answer fails. Use the explanations to identify whether you missed a lookup, a setup step, arithmetic or a detail in the question.
Does buying the book include the code book or online practice pack?
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Will a mock score predict my result?
No. Treat a mock as a way to locate weak topics. Review guessed answers as well as wrong ones, then solve a fresh question without copying the explanation.
Is this official training, a license or a pass guarantee?
No. Independent study material does not grant a license, replace required training or authorize electrical work. Use current official exam instructions and qualified supervision for actual work.
Our own independently published study books. Amazon sets the current price, availability, delivery and preview. Paperback and Kindle are separate purchases. No official NEC code book, paid app membership or separately sold online practice pack is included. These are original practice materials, not official examination questions or a pass guarantee.
