Home Wiring in Practice

How it's made

Built so you can find it in seconds

1Each topic drawn, with the note box right beside it
257 pages in 8 parts, one topic per page
3Sources: NFPA 70 (NEC), NFPA 70E and OSHA 29 CFR 1910/1926

A different way to learn

Section 90.3 as the code book prints it, and as the page draws it

The same topic, explained two ways.

A text manual

The organization of the Code is described in Section 90.3. The first four chapters establish general requirements applicable to all installations. The fifth through seventh chapters address special occupancies, special equipment and special conditions, and may supplement or modify the general provisions. Communications systems in Chapter 8 remain independent of the preceding chapters unless specifically referenced, while Chapter 9 provides tables that are applied only where cited elsewhere.

A text manual

You flip through the NEC front to back hoping the article shows up.
You memorize that Chapter 3 is wiring methods without knowing why it matters.
You ask the journeyman on site which chapter overrides which.

90.3: Chapters 1-4 apply generally, 5-7 modify them, Chapter 9 holds the tables. — **This book**
A map of the nine chapters shows where each kind of question lives.
90.3 is drawn as layers: 1-4 general, 5-7 modify them, 8 stands alone, 9 holds the tables.
The callout spells out the order: Chapters 5 through 7 can modify Chapters 1 through 4.

Inside

A Panel With the Cover Off, a 40-Amp Circuit, and the Wrong Column

You're on a job site with the panel cover off. The plans call for a circuit with 8 AWG copper, 90 °C insulation, and the equipment terminals are rated for 75 °C: which column of the table do you read?

You could flip through the code book and hope the article shows up, or ask the journeyman, who is two floors up. The explanation you find says it in paragraphs: the insulation rating, the terminal rating, the temperature limits.

In the book, Table 310.16 is one page. Copper sits on the left and aluminum on the right, each with three temperature columns, and a box reminds you that the table number is only a starting value: terminations, temperature and conductor count can lower it.

The rest works the same way: conduit fill, grounding, motor circuits, working space at the panel. Each one has its own page.

You look at the page, pick the column and get back to the panel, without rereading the whole article.

Table 310.16: 8 AWG copper = 40 / 50 / 55 A at 60 / 75 / 90°C

Real pages

A look inside the pages

One big drawing per page, with a box of what to remember.

A 1.500 W heater at 120 V draws 12.5 A: I = P ÷ E, read straight off the wheel.

Chapter 9 Table 1: 53% · 31% · 40%, and 60% for a nipple of 24 in or less

Table 240.6(A) in one row: round up to the next size only up to 800 A

210.11(C): 2 small-appliance + laundry + bathroom + garage, each 20 A

430.6(A): table FLC for wire and breaker, nameplate FLA for overloads

110.26: 3 ft up to 150 V to ground, up to 4 ft to 600 V, 5 ft to 1000 V, 30 in wide, 6 1/2 ft high

These are real pages from the book. The table of contents is the full one: 8 parts and 53 topics.

Contents

The 8 parts, in order

1
The Theory Behind the Job
The Ohm's law wheel, series and parallel, single- and three-phase, the 1.732, transformer ratios and voltage drop in four steps.
2
Finding It in the Code Book
How the NEC is laid out (90.3), Article 100 definitions, the index vs. the table of contents, table notes and exceptions, your state's edition and tabbing the book.
3
Conductors and Ampacity
Table 310.16 column by column, terminations, the small-conductor rule, ambient correction, adjustment for bundled conductors and continuous loads at 125%.
4
Raceways and Boxes
Chapter 9 Table 1, conduit fill in a fixed order, box fill counting and volumes, supports and bends, and burial depth from Table 300.5.
5
Overcurrent Protection and Grounding
Standard breaker sizes, grounding vs. bonding, GEC and EGC sizing, the electrode system, bonding jumpers and the single neutral-ground bond.
6
Dwellings: Branch Circuits and Load Calcs
Required dwelling circuits, the 6-12 receptacle rule, countertops, GFCI and AFCI, the dwelling load calc in three steps and the optional method.
7
Motors, Transformers and Special Locations
Motor FLC and protection, transformer overcurrent protection, hazardous locations, pools and equipotential bonding, and service drop clearances.
8
Safety and Review
Working space at panels, NFPA 70E boundaries, OSHA on the job site, lookup vs. calculation on the job, and the most frequent mistakes on one page.

At the end of the book: A page on lookup vs. calculation and a one-page review of the most frequent mistakes

Price US$ 27 ~~US$ 63~~

I want the PDF book

Easy to mix up

Spot the mistake before it costs you

Every page ends with the mix-up that trips people up.

p. 24 · CHAPTER 9 TABLE 1: 53, 31, 40EASY TO MIX UP

Two conductors gets the SMALLEST percentage (31%), not the largest. More than two goes back up to 40%.

p. 46 · MOTOR FLC: TABLE, NOT NAMEPLATEEASY TO MIX UP

Wire and breaker: table FLC. Overload: nameplate FLA. Swap them and the answer is wrong.

Added value

The book, plus 2 free bonuses

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Bonus 1

«Self-Check Test with Answers»

Check yourself with questions from the job, each answer explained and tied to the NEC article or table where you'd find it.

~~US$ 17.90~~ FREE

Bonus 2

«Code Book Tabs Cheat Sheet»

The articles and tables worth tabbing, on one sheet you can print and keep next to your code book.

~~US$ 14.90~~ FREE

Home Wiring in Practice + 2 bonus books

Home Wiring in Practice: 57 pages in 8 partsUS$ 63
Bonus 1: «Self-Check Test with Answers»US$ 17.90
Bonus 2: «Code Book Tabs Cheat Sheet»US$ 14.90
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Who it's for

Is it for you?

Pick the one that sounds like you.

You're an apprentice or a helper

You do the work every day, but the code text slows you down. The Table 310.16 page shows you which column to read, with the terminal rating right in the drawing.

You've wired for years, but the theory's rusty

The Ohm's law wheel and the 1.732 of three-phase each get one page, so a 1,500 W heater at 120 V becomes 12.5 A in seconds.

You're moving up to journeyman

Each calculation runs in the same order, and every page names the article or table to open, like Table 250.66 for the grounding electrode conductor.

Questions

What people ask most

Quick answers before you decide.

Is it for me if I've never wired a house, or if I've done it for years?

Both. The first part builds the theory from Ohm's law, and the rest is organized by what you look up on the job. If you've wired for years, most pages are about finding the answer in the code and working the calculations: load calcs, conduit and box fill, grounding and motor protection.

How do I get the book?

The book and the two bonuses come as PDFs by email.

Is it a one-time payment?

Yes. You pay once and there's no subscription.

Does it replace my code book, my apprenticeship or a course?

No. It sits next to the code book and points you to the article or table. You still need the official NEC edition your state uses, your training hours and your state board's requirements. It doesn't come with a certificate or count as continuing education hours.

Where does the content come from?

From NFPA 70 (NEC), NFPA 70E, OSHA 29 CFR 1910 Subpart S and 1926 Subpart K, and state licensing board candidate bulletins. Pages cite article and table numbers; they don't reproduce the code text.

Does it match my state's NEC edition?

Article and table numbers follow the 2020 and 2023 NEC. Where a rule changed between editions, like the 20 A garage circuit added in 2020, the page says so. Check which edition and state amendments your jurisdiction has adopted.

Can I print it?

Yes, you can print the PDF at home and take it to the job. Check your state's and your employer's rules before you tab your code book with the cheat sheet.

Is this affiliated with NFPA?

No. It's independent study material and isn't affiliated with or endorsed by NFPA. NEC and National Electrical Code are registered trademarks of NFPA.

How does the refund work?

You have 30 days. We refund everything if the file won't open, if the book isn't what you see on this page, if you were charged twice or if the email doesn't arrive: just email us.

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📄 This is a digital PDF book sent to your email: nothing is printed or shipped.

Built so you can find it in seconds

Section 90.3 as the code book prints it, and as the page draws it

A Panel With the Cover Off, a 40-Amp Circuit, and the Wrong Column

A look inside the pages

The 8 parts, in order

The Theory Behind the Job

Finding It in the Code Book

Conductors and Ampacity

Raceways and Boxes

Overcurrent Protection and Grounding

Dwellings: Branch Circuits and Load Calcs

Motors, Transformers and Special Locations

Safety and Review