Based on the 2017 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]. Other types of areas are also described in 516.2; read carefully and compare to the area you're working with.
     
  3. For any location where one of these applications takes place, you must classify the location [516.4]. 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, and you have five types of area to consider [516.4]. But Figure 516.4 makes this task much easier than it otherwise would be.
     
  5. Use Figures 616.5(D)(1) and (2) if you're working with unenclosed spray areas.
     
  6. Use Figures 616.5(D)(4) if you're working with enclosed spray areas.
     
  7. If equipment is within a Class I location, apply 516.6.
     
  8. If equipment is not within a Class I location (or a Class II), apply 516.7.
     
  9. Read through 516.10 to see if any of the equipment you're working with is considered "special equipment."
     
  10. In Article 516, you will find references 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.