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90
Article 90 — Introduction
10 sections
The foundation of the NEC. Covers the purpose, scope, and arrangement of the code. Essential reading before you dive into anything else.
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100
Article 100 — Definitions
1 section
Every defined term in the NEC. If you've ever argued about what "accessible" or "qualified person" actually means, this settles it.
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110
Article 110 — Requirements for Electrical Installations
40+ sections
General requirements for electrical equipment and installations. Covers examination, installation, use, access, spaces, and tunnel wiring.
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