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National Electrical Code Articles and Information

National Electrical Code Violations

We see Code violations all the time. And where there's one, there are usually many. For example, look at the photo at right. How many Code violations can you see? Click on the photo to get a clear view. Go ahead--you should be able to see at least six violations. KCViolation_001.jpg (49597 bytes)

If you saw less than six Code violations, you need to start taking Mike Holt's Code courses. And, yes, we at Codebookcity have contributed to those courses. Don't think we're being tricky on the Code violations count. We spotted 12 Code violations. If you can't get half that many, you need Mike Holt's Code courses.

Now, can you spot the Code violations in the pictures below? These pictures are the property of Joe Tedesco. Joe is a nationally-recognized NEC expert, trainer, and author.

TedescoViolation_0001.jpg (80064 bytes), code violations  TedescoViolation_0004.jpg (33307 bytes) TedescoViolation_0003.jpg (54019 bytes) TedescoViolation_0002.jpg (14974 bytes)

TedescoViolation_0005.jpg (85336 bytes)

TedescoViolation_0006.jpg (106958 bytes)

Check out these Nonmetallic Cable installations. How many violations can you spot?



How the NEC is arranged

  1. The first four Chapters of the NEC apply to all installations.
  2. Article 90 precedes Chapter One, and establishes the authority of the NEC.
  3. Article 80 follows the body of the NEC; it exists as Annex H. It provides the requirements for administration.
  4. Chapters 5, 6, and 7 are the "special" chapters, covering special: occupancies, equipment, and conditions (in that order).
  5. Chapter 8 provides the requirements for communications systems.
  6. Chapter 9 provides tables.
  7. The appendices provide mostly reference information.
  8. Appendix D contains examples that every NEC user should study.

Try your NEC moxy:

  • Do you know the difference between bonding and grounding? Hint: Look in the NEC, Article 100.
  • Does the NEC refer to grounding incorrectly in any of its articles? Yes! So be careful to apply the Article 100 definitions. Don't ground where you should bond.
  • When doing motor load calculations, which Article covers hermetic motors? Answer: While Article 440 covers the application of hermetic motors, it does so only by amending Article 430 because hermetic motors are a special case of motors. For motor load calculations, refer to Article 430.
  • Does the NEC provide a voltage drop requirement? Yes! It does so in a special case, which is Article 648 Sensitive Electronic Equipment. But for general applications, it does not provide a requirement; it merely provides a recommendation in a couple of FPNs.
  • Take our Code Quizzes.

Remember other applicable codes, rules, standards, and references:

  • OSHA's electrical worker safety rules.
  • IEEE standards.
  • NETA standards.
  • NFPA standards.
  • International Codes (if applicable to the installation).
  • State Codes (if the state has them).
  • Local ordinances and permit requirements.
  • Local fire codes.
  • Manufacturer requirements or guidelines.
  • Customer security requirements.
  • Industry standards.
  • Your company's own internal standards, practices, and procedures.
  • Engineering drawing notes.


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