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National Electrical Code Articles and Information

NEC Quiz: Article 250, Part Thirteen Answers

by Mark Lamendola

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  1. [250.98]. Make them electrically continuous.
     

  2. [250.100(D)]. Size it per Table 250.122.
     

  3. [250.100(E)]. It can be in either location. What's critical is it's limited to 6 ft in length if outside. If it's inside, it must comply with 250.119 and 250.148.
     

  4. [250.104]. It has to be bonded. The bonding requirements are fairly lengthy, so read them carefully. Don't assume that the water pipe is bonded or grounded. Many people have been killed due to making this assumption.
     

  5. [250.106]. You connect them. That is, you bond them. The last thing you want is a flashover from the lightning protection system to something metallic in your building electrical system. You'll find further details in NFPA 780, Standard for the Installation of Lightning Protection Systems and in the Lightning Protection Institute's LPI-175, Standard Practice for the Design - Installation - Inspection of Lightning Protection Systems.
     

 

 

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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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