Mike Holt reviews from electricians (review 2)

What Mike Holt Actually Is

Mike Holt Enterprises sells NEC training materials, exam prep, and continuing education. Books, video courses, illustrated code references. The reputation is earned, the man has been teaching code since the 80s and his graphics are some of the clearest in the trade.

But "Mike Holt reviews" usually means one of three things: the printed Understanding the NEC books, the online code library subscription, or the exam prep bundles. They are not the same product and they do not solve the same problem on a job site.

Here is the honest take from someone who has run conduit for fifteen years and studied for two masters exams using his material.

The Books Are Excellent for Studying

The Understanding the NEC Volume 1 and Volume 2 books are the gold standard for exam prep. Color illustrations, worked examples for box fill, conductor sizing per 310.16, voltage drop, grounding and bonding under Article 250. If you are sitting for a journeyman or master test, you buy these. Period.

The problem starts when you try to use them in the field. Volume 1 alone is over 600 pages. You are not pulling that out of the truck at 2pm on a service call to look up GFCI requirements under 210.8(A). You remember roughly where it is, you flip, you find the wrong section, you flip back.

• Volume 1: General installation, grounding, wiring methods (Articles 90 through 480)
• Volume 2: Special occupancies, equipment, conditions (Articles 500 through 820)
• Exam Prep: Separate workbook with practice questions and timed tests
• Changes to the NEC: Cycle update book, useful but redundant if you have the new edition

Verdict on the books: buy them for the test, keep them on the shelf for deep dives, do not rely on them for daily lookups.

The Online Library Subscription

Mike Holt sells a subscription to his digital library that includes searchable code text, his commentary, and video clips. Roughly $20 a month at last check, sometimes bundled with course access.

Search works. The commentary is useful when you hit something weird like 110.26 working space or the receptacle requirements in 210.52(C) for kitchen islands under the 2023 cycle. The video clips are short and on point.

Where it falls short: the interface is built around training, not field reference. You log in, you navigate menus, you wait for things to load. On a basement slab with one bar of LTE, that is a problem. There is no offline mode worth using. Search returns Mike's articles and videos alongside the code text, which is great for learning and noisy when you just need the answer to "what size EGC for a 100 amp feeder" (Table 250.122, 8 AWG copper).

If you are studying at the kitchen table at night, the subscription earns its keep. If you are in a crawlspace at noon, you want something that opens in two taps and works without signal.

Exam Prep Bundles

For passing a state journeyman or master exam, Mike Holt's bundle is hard to beat. Calculations workbook, practice tests, video instruction on the math, and the theory book.

The calculations book in particular is worth the price by itself. Service load calcs under Article 220, motor calcs under 430, voltage drop, conduit fill per Chapter 9 Tables 1, 4, and 5. He shows the work step by step and the order matches how the test asks the questions.

1. Read the theory book first, take notes on the index tabs
2. Work the calculations book cover to cover, twice
3. Take the practice exams under timed conditions, no looking up answers
4. Review every wrong answer against the cited code section

Apprentices who follow that pattern pass. The material is not the bottleneck, the discipline is.

Where Mike Holt Falls Short on the Job

This is not a knock on the company, it is a knock on using training material as field reference. Two different jobs.

You need a fast answer on conductor ampacity adjustment when you have six current carrying conductors in a raceway (Table 310.15(C)(1), 80 percent). You need to confirm whether a receptacle outlet behind a refrigerator counts toward the small appliance branch circuits under 210.52(B). You need it in under thirty seconds with greasy hands and a phone screen.

Mike Holt's products were not designed for that. They were designed to teach you the code well enough that you do not need to look it up. Which is the right goal, until the day you do need to look it up.

The best electricians I know own Mike Holt books and use a fast lookup tool in the field. Different tools for different moments.

Bottom Line

Mike Holt is the right answer for learning the code, passing your exam, and understanding the why behind the rules. The illustrations alone justify the cost of the books for any apprentice or journeyman pushing toward master.

It is not the right tool for a quick lookup on the truck. The books are too thick, the website is too slow, and the search is tuned for students rather than installers under time pressure. If you treat his material as continuing education and pair it with a field reference built for speed, you get the best of both. Use Mike Holt to know the code. Use something else to find the article when the inspector is standing next to you.