Study Guides
Free in-depth guides covering electrical theory, NEC code articles, HVAC fundamentals, and exam concepts — with fully worked examples.
What actually changed between NEC 2020, 2023, and 2026 -- and why it matters for your exam.
A plain-English walkthrough of what actually changed between the 2020 and 2023 National Electrical Code — GFCI expansion, surge protection, and the table renumbering that trips up anyone still studying from an old book.
A plain-English breakdown of the biggest structural changes coming in the 2026 NEC — the Article 220-to-120 renumbering, the lighting load reduction, new medium-voltage articles, and what it means for candidates still testing on 2020 or 2023.
Key formulas · NEC articles · Ampacity tables · Exam tips
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