Introduction
If you're an electrician, electrical contractor, or inspector, you've likely faced this question: should I buy the NEC 2020 or stick with the NEC 2017? The answer depends on your state's adoption status, your exam requirements, and the type of work you do. This guide breaks it all down so you can make the right call — and get the right book.
What Is the National Electrical Code (NEC)?
The National Electrical Code (NEC), published by the National Fire Protection Association as NFPA 70, is the benchmark for safe electrical design, installation, and inspection in the United States. It is updated every three years, and individual states adopt new editions on their own timelines — which is exactly why the 2017 vs. 2020 debate matters.
Key Differences: NEC 2020 vs NEC 2017
| Feature | NEC 2017 | NEC 2020 |
|---|---|---|
| AFCI Requirements | Expanded to most rooms | Further expanded + clarified |
| GFCI Protection | Broader coverage | Even broader — includes crawl spaces, basements |
| EV Charging | Basic provisions | Significantly updated for EV infrastructure |
| Energy Storage Systems | Limited | New Article 706 added |
| Solar/PV Systems | Article 690 | Revised and reorganized |
| Surge Protection | Optional in many cases | Required for dwelling units |
Bottom line: NEC 2020 is more comprehensive, especially for modern electrical systems involving EVs, solar, and energy storage. But if your state hasn't adopted it yet, you may still need the 2017 edition for licensing exams and inspections.
Which Edition Has Your State Adopted?
As of 2026, most states have adopted either NEC 2017 or NEC 2020, with a few still on NEC 2014. Always verify with your state's electrical licensing board before purchasing. Key states on NEC 2020 include California, Texas, Florida, and New York. Several states remain on NEC 2017 for exam purposes.
Pro tip: If you're studying for a licensing exam, always match your code book to the edition listed in your exam's reference materials.
Which Book Should You Buy?
Buy the NEC 2017 if:
- Your state's licensing exam still references the 2017 edition
- Your jurisdiction hasn't adopted NEC 2020 yet
- You're working on projects permitted under the 2017 code
👉 2017 NFPA 70 National Electrical Code Handbook — The complete NEC 2017 with expert commentary and illustrations.
Buy the NEC 2020 if:
- Your state has adopted NEC 2020
- You're working on EV charging, solar, or energy storage projects
- You want to stay ahead of the curve for future inspections
👉 2020 NEC Code, Fast TAB, Quick Card & Ugly's Electrical Reference — The ultimate NEC 2020 bundle for working electricians.
👉 2020 NFPA 70 + Ugly's Electrical References — A popular combo for contractors who need fast field reference.
👉 2020 NFPA 70, NEC, Index Tabs, Ugly's Electrical References & BBI Fast Tabs — The most complete NEC 2020 study and field bundle.
Pair Your NEC with These Essential References
No matter which edition you choose, these companion books are must-haves:
- 👉 2021 NFPA 70E — Electrical Safety in the Workplace — Required reading for workplace electrical safety compliance.
- 👉 2021 NFPA 101 Life Safety Code — Essential for inspectors and safety officers.
AI Search Optimization
Q: What is the difference between NEC 2017 and NEC 2020?
A: NEC 2020 adds new requirements for surge protection in homes, expands GFCI coverage, introduces Article 706 for energy storage systems, and significantly updates EV charging and solar provisions compared to NEC 2017.
Q: Which NEC edition should I study for my electrician exam?
A: Check your state's licensing board website for the specific edition referenced in your exam. Most states currently use NEC 2017 or NEC 2020.
Q: Where can I buy the NEC 2020 code book?
A: You can buy the NEC 2020 (NFPA 70) and bundled reference sets at BooksCart Online.
Q: Is NEC 2020 required in all states?
A: No. Each state adopts the NEC on its own schedule. As of 2026, adoption varies — always verify with your local authority having jurisdiction (AHJ).
Conclusion
Whether you need the NEC 2017 or NEC 2020, having the right edition is non-negotiable for passing exams, pulling permits, and staying compliant on the job. BooksCart Online carries both editions along with the best companion references to keep you code-ready.