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National Electrical Code Articles and Information

National Electrical Code Explanations

Based on the 2008 NEC

National Electrical Code Top Ten Tips: Article 342 through Article 362 -- Conduits

by Mark Lamendola

Please note, we do quote from copyrighted material. While the NFPA does allow such quotes, it does so only for the purposes of education regarding the National Electrical Code. This article is not a substitute for the NEC.

These are the 10 NEC Article 320 through NEC Article 340 items we deem most important, based on the pervasiveness of confusion and the potential costs of same.

  1. NEC Article 342 through 362 contain the requirements for various types of conduit. Remember that, and your life will be much easier.
     
  2. Note that conduit is a subcategory of raceway. EMT is not a type of conduit  It's a type of raceway.
     
  3. Each Article in this series provides the uses permitted and the uses not permitted.
     
  4. NEC Article 350 presents requirements for Liquidtight Flexible Metal Conduit: Type LFMC. Note that the smallest allowable trade size is 1/2, and the largest allowable trade size is 4. There are limits on length and bending.
     
  5. Article 356 provides the requirements for Liquidtight Flexible Nonmetallic Conduit: Type LFNC. The requirements are similar to those of Type LFMC, but there are some differences. For example, there are no exceptions to the requirement for installing a grounding conductor.
     
  6. NEC Article 352 presents the requirements for Rigid Nonmetallic Conduit: Type RNC. Any fittings used with the conduit must be Listed. You cannot use plumbing pipe fittings with RNC. There are limits on where you can used this. Note, also, that you must provide expansion fittings with RNC.
     
  7. NEC Article 354 presents the requirements for Nonmetallic Conduit with Conductors: Type NUCC. You cannot use Type NUCC in exposed locations or inside buildings.
     
  8. All types of conduit must be supported.
     
  9. You cannot use any conduit to support other wiring.
     
  10. Refer to the tables in Chapter 9 for raceway fill requirements.

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Learn more about: Electrical Calculations | Electrical Theory | Grounding | Harmonics | Motors | Power Quality
 

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, what 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 application, 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.

Here are a couple more NEC resources: Contractor Cafe Code Site | Joe Tedesco's National Electrical Code

 

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