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National Electrical Code Articles and Information

Based on the 2008 NEC

by Mark Lamendola

National Electrical Code Top Ten Tips: Article 516 -- Spray Application, Dipping, and Coating Processes

  1. Article 516 covers the regular (as in time, not as in "normal") or frequent application of liquids or powders that may burn [516.1].
     
  2. Article 516 differentiates between a spray room, spray booth, and spray area [516.2].
     
  3. For any location where one of these applications takes place, you must classify the location [516.3]. This is your first task in applying Article 516. After you determine the classification, you will then need to conform to the applicable requirements that follow from 516.5 onward.
     
  4. The requirements for this can seem mind-numbing. But really, they aren't. You have only three to choose from [516.3(A), (B), and (C).].
     
  5. Use Figure 616.3(C)(5) to help you determine what classification you are working with.
     
  6. There are three more types of locations that yours may be in addition to, or instead of, one of the three you just looked at. Choose these from [516.3(D), (E), and (F).].
     
  7. If equipment is within a Class I location, apply 516.4.
     
  8. If equipment is not within a Class I location (or a Class II), apply 516.5.
     
  9. Read through 516.10 to see if any of the equipment you're working with is considered "special equipment."
     
  10. 516.10 and 516.16 refer to "grounding." This is incorrect. What it is actually referring to is bonding. You can see this if you read the definitions of grounding and bonding in Article 100 and then read the actual requirements provided in 516.10 and 516.16. In fact, you should not ground anything in these systems. Bond it, only. See Article 250, Part IV.

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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.
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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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