Mike Holt accuracy test (review 6)

Why I Ran This Test

Mike Holt is the gold standard for NEC training. His books, videos, and illustrated guides are on half the trucks in the trade. So when I built Ask BONBON, I had to answer the obvious question: how does an AI-powered code reference stack up against material from the most trusted name in electrical education?

I'm a working electrician. I pull permits, I fail inspections, I pass them. I don't care about marketing. I care about getting the right answer in under 30 seconds while standing on a ladder with a meter in one hand.

Here's what I found after running 40 real code questions through both.

The Test Setup

I pulled 40 questions from jobs I've actually worked in the last six months. Residential service upgrades, commercial tenant fit-outs, a couple of industrial panel swaps. Mix of straightforward lookups and gray-area interpretation calls.

For Mike Holt, I used his Understanding the NEC Volume 1 and 2 (2023 edition) plus his online code forum archives. For Ask BONBON, I typed the question into the app. Same phrasing, same day.

• 25 lookup questions (e.g., "GFCI required for a wet bar sink 4 feet from the counter edge?")
• 10 calculation questions (box fill, conductor sizing, voltage drop)
• 5 interpretation questions (the ones that start arguments on the job site)

Lookup Questions: Close Call

Mike Holt won on depth. When I looked up GFCI requirements under NEC 210.8(A), his commentary walked through the 2020 to 2023 changes, the receptacle versus outlet distinction, and why the 6-foot rule from a sink edge matters. That context is gold if you have time to read it.

Ask BONBON won on speed. I got the 2023 NEC 210.8(A)(7) answer in about 8 seconds, with the exact code text and a plain-English summary. For the wet bar question, it flagged the 6-foot measurement rule and cited 210.8(A) directly.

Tip: on a GFCI dispute with an inspector, pull the code text first, then the commentary. Inspectors argue with interpretation. They don't argue with 210.8(A) verbatim.

Score: Holt 14, BONBON 11 on pure accuracy. But BONBON averaged 12 seconds per answer versus 3 to 4 minutes flipping through Holt's index.

Calculations: BONBON Edge

This is where the AI tool pulled ahead. Box fill under NEC 314.16(B) is the kind of math that eats time on a job. I asked both sources to size a 4-inch square box with six 12 AWG conductors, two cable clamps, and one device yoke.

Mike Holt's method is correct and the worked examples in his book are excellent for learning. But I had to find the right chapter, work through the example, then plug in my numbers. About 6 minutes.

Ask BONBON returned the answer in under 15 seconds with the calculation shown step by step: conductor volume, clamp allowance, device yoke allowance, total cubic inches required, and whether my box was compliant. Same answer Holt would give. Faster.

• Box fill: BONBON faster, same answer
• Conductor ampacity (310.16): tie, both correct
• Voltage drop: BONBON showed the formula and the math, Holt explained the theory better

Interpretation: Holt Still Wins

The 5 gray-area questions are where Mike Holt's decades of experience showed. I asked about a situation with a detached garage feeder, a subpanel, and whether the grounding electrode conductor needed to bond at both ends per NEC 250.32.

Ask BONBON gave a technically correct answer citing 250.32(B) and the exceptions. But Holt's commentary explained why the 2008 code change happened, what inspectors actually look for, and the failure mode that drove the rewrite. That's the kind of context that keeps you from failing an inspection over a detail the code text alone doesn't spell out.

For code interpretation disputes, Holt is still the reference. No AI has 40 years in the trade.

Honest Verdict

Ask BONBON is not a Mike Holt replacement. If you're studying for your journeyman or master's exam, buy the Holt books. If you're teaching an apprentice, use the Holt videos. The depth and teaching quality are not even close.

But if you're on a job, you need an answer in 30 seconds, and your phone is the only tool you can use one-handed, Ask BONBON is faster and accurate enough for 90% of lookups and calculations. I use both. Holt at night, BONBON on the truck.

Tip: the best electricians I know don't pick one reference. They use the fastest tool for the situation and verify anything that looks off against a second source.

Final tally on my 40 questions: Holt 36 correct with full context, BONBON 35 correct with faster delivery. One disagreement turned out to be a BONBON error on a 2020 versus 2023 code change. Worth knowing. Worth verifying when the stakes are high.