Ten Tips on understanding the National Electrical Code
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.
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.
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!
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 servicesódo you see the pattern, here?
Chapters 2, 3, and 4 are where the typical
electrician needs to focus--especially if studying for a National Electrical Code
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.
Chapter 9 has your tables and examples. Spend
some time becoming familiar with these and how to apply them!
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.
For determining voltage drop and wiring sizes,
work with Chapter 9, Tables 8 and 9--mostly Table 9 for a National Electrical
To make best use of the Tables in Chapter 9,
read the "Notes to Tables" before working with the Tables. Itís amazing
how many people end up going to these notes after hours of misusing the Tables.