The NEC changes every three years, and each new edition can change the rules you studied for your last exam. If you have ever wondered why one state enforces the 2020 edition while another is already on 2023, this post explains the history of the NEC, how each edition is made, and how the code becomes law in each state.
The First Electrical Code: 1897
The story starts in the 1890s, when electric lighting was spreading through American cities and fires caused by bad wiring were common. Insurance companies were paying for the damage, so in 1897 a group of electrical, insurance and building organisations published the first National Electrical Code. Cities adopted it, and electrical fires fell. The NFPA took over publication, and the code became known as NFPA 70. It has been revised ever since, as new technology forced the rules to change.
The 3-Year Revision Cycle
Since the 1970s, the NFPA has published a new edition of the NEC every three years: 2014, 2017, 2020, 2023, and the next edition due in 2026. Each cycle follows the same open process, and anyone can take part in it. First comes public input, where anyone can propose new rules or changes. Then a panel of experts reviews the proposals and writes a first draft. The draft is published for public comment. The panel then writes a second draft, and the NFPA membership votes on the result at its annual meeting. Only then is the new edition issued. The process is deliberately slow and public, because a rushed rule can cost lives.
How the Code Has Changed Over Time
Each edition reflects the technology and the accidents of its time. The 1996 edition first required arc-fault circuit interrupter (AFCI) protection in bedrooms, after fires caused by damaged cords and loose connections. The 2020 edition required surge protection at the service of every dwelling (Article 230.67) and an outdoor emergency disconnect (Article 230.85). The 2023 edition expanded GFCI protection and added rules for energy storage and EV charging.
Diagram: A timeline of NEC editions. The code began in 1897 and is revised every three years. Each edition adds new protection, such as AFCI in 1996, surge protection in 2020, and expanded GFCI rules in 2023.
How States Adopt the Code
The NEC is a model code, not a federal law. It becomes law only when a state, county or city adopts it, and each place adopts it on its own schedule. The local Authority Having Jurisdiction, the AHJ, enforces it. A state may take one, two or even three years after a new edition is published to adopt it. As a result, different states enforce different editions at the same time. Some states add local amendments, extra rules written for local conditions. Check which edition your local AHJ has adopted before you design or study.
Why Editions Matter for Exams and Jobs
For students and engineers, the edition matters twice. First, licensing exams test the edition your state has adopted. A journeyman or master electrician exam in a state on the 2020 edition will ask about 2020 rules, not 2023 rules, and an answer that is right under one edition can be wrong under another. Second, real design work must follow the adopted edition. An engineer who designs to the wrong edition may miss a rule the inspector requires. Keep a copy of your state's edition, and confirm the edition with the AHJ before every project.
Diagram: How a new NEC edition is made. Public input is followed by a first draft, public comment, a second draft, and a vote at the NFPA annual meeting. The whole cycle takes about three years.
Key Takeaways
The NEC began in 1897 as a response to electrical fires, and the NFPA has revised it every three years since the 1970s. Each edition is made through an open public process of proposals, drafts and comments, and each edition adds protection. The code becomes law only when a state or local AHJ adopts it, so different states enforce different editions, sometimes with local amendments.
Objective Questions
1. In which year was the first National Electrical Code published?
a) 1897
b) 1911
c) 1925
d) 1947
Answer: (a) 1897
Explanation: The first National Electrical Code was published in 1897, after electrical fires caused by bad wiring became common in American cities.
2. How often does the NFPA publish a new edition of the NEC?
a) Every year
b) Every two years
c) Every three years
d) Every five years
Answer: (c) Every three years
Explanation: The NFPA publishes a new edition of the NEC every three years, most recently 2020 and 2023, with the next edition due in 2026.
3. What is the first step in the NEC revision process?
a) The NFPA membership votes at its annual meeting
b) A code-making panel writes a second draft
c) Public input, where anyone can submit proposals for new or changed rules
d) States adopt the new edition
Answer: (c) Public input, where anyone can submit proposals for new or changed rules
Explanation: Each revision cycle starts with public input, in which electricians, engineers, manufacturers and inspectors submit proposals.
4. Which NEC article requires surge protection at the service of every dwelling unit, added in the 2020 edition?
a) Article 210.8
b) Article 210.12
c) Article 230.67
d) Article 230.85
Answer: (c) Article 230.67
Explanation: Article 230.67, added in the 2020 edition, requires a Type 1 or Type 2 surge-protective device at the service of every dwelling unit.
5. Why can two neighbouring states enforce different editions of the NEC at the same time?
a) Because the NEC is a federal law that changes by state
b) Because each state adopts the code on its own schedule through its own AHJ
c) Because the NFPA publishes different editions for different states
d) Because the code changes every year
Answer: (b) Because each state adopts the code on its own schedule through its own AHJ
Explanation: The NEC is a model code that becomes law only when a state or local AHJ adopts it, so adoption takes different amounts of time in different places.
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