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Illustrated Changes to the NEC, 2005 Edition - Part 1

Article 100



Have you ever had a conversation with someone, only to discover what you said and what he/she heard were completely different? This happens when one or more of the people in a conversation do not understand the definitions of the words being used, and that's why the definitions of key terms are located right up in the front of the NEC, in Article 100.

If we can all agree on important definitions, then we speak the same language and avoid misunderstandings. Because the NEC exists to protect people and property, we can agree it's very important to know the definitions presented in Article 100.

Now, here are a couple of things you may not know about Article 100:

  • Article 100 contains the definitions of many, but not all, of the terms used throughout the NEC. In general, only those terms used in two or more articles are defined in Article 100.
  • Part I of Article 100 contains the definitions of terms used throughout the NEC.
  • Part II of Article 100 contains only terms that apply to systems that operate at over 600V.

How can you possibly learn all these definitions? There seem to be so many. Here are a few tips:
  • Break the task down. Study a few words at time, rather than trying to learn them all at one sitting.
  • Review the graphics in the textbook. These will help you see how a term is applied.
  • Relate them to your work. As you read a word, think of how it applies to the work you're doing. This will provide a natural reinforcement of the learning process.

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©2005 Mike Holt Enterprises, Inc.