Ten Tips on understanding the National Electrical Code

1. You can see the National Electrical Code is laid it out in Articles and Chapters. Each Chapter contains related Articles. When making your way through the Code, think of the related topics you need to consider, then go to the Chapter that contains those topics. Inside that Chapter, you merely need to find the Article that addresses your topic.
2. Article 90 is the introduction. It lays the foundation for understanding the National Electrical Code's scope and purpose, and where it fits into your work.
3. Chapter 1, Article 100 covers definitions. Did you know Code experts often resolve National Electrical Code misunderstandings by simply using excerpts from Article 100? Become familiar with this Chapter, and you'll be ahead of the game. Try it!
4. Chapter 2 covers wiring and protection, as well as grounding. Article 250 is "the grounding chapter." Article 210 covers branch circuits, Article 215 covers feeders, Article 220 covers calculations, Article 230 covers services—do you see the pattern, here?
5. Chapters 2, 3, and 4 are where the typical electrician needs to focus--especially if studying for a National Electrical Code exam.
6. Chapters 5, 6, 7 and 8 apply to nontypical applications, or specialized areas of electrical work. You don't need to study these for a National Electrical Code exam.
7. Chapter 9 has your tables and examples. Spend some time becoming familiar with these and how to apply them!
8. If you are doing non-specialized work, make a point of studying Chapters 1, 2, 3, and 4. Browse Chapter 9 to become familiar with what is in it, and work through the examples.
9. For determining voltage drop and wiring sizes, work with Chapter 9, Tables 8 and 9--mostly Table 9 for a National Electrical Code exam.
10. To make best use of the Tables in Chapter 9, read the "Notes to Tables" before working with the Tables. It’s amazing how many people end up going to these notes after hours of misusing the Tables.