Aticle 516. Spray Application, Dipping, Coating, and Printing Processes Using Flammable Combustible Materials.

Many illustrations were changed in Article 516. Look at figure 516.3(D)(1). Notice the solid blue spray area in the center of the top image. If the spray finish being applied was combustible powder coating, would this area be a Class I or Class II location?
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Many illustrations were changed in Article 516. Look at figure 516.3(D)(1). Notice the solid blue spray area in the center of the top image. If the spray finish being applied was combustible powder coating, would this area be a Class I or Class II location?

Code Change Summary: Article 516 was rewritten/reorganized and the title was changed.

Article 516 was almost completely rewritten to bring the article more in line with the 2007 version of NFPA 33, Standard for Spray Application Using Flammable or Combustible Materials and NFPA 34 Standard for Dipping, Coating, and Printing Processes Using Flammable or Combustible Liquids. Informational notes in the 2014 NEC® article were pulled from the 2011 versions of NFPA 33 and 34 but the rest of article 516 was updated to the 2007 versions only.

Previously, the articles text was derived from outdated versions of NFPA 33 and 34 and it was time for an update.

Revised illustrations were created and 4 new definitions were also added.

Don’t get too fond of the new article because it is likely to see another complete overhaul in the 2017 NEC® once again.

Below is a preview of the NEC®.  See the actual NEC® text at NFPA.ORG for the complete code section. Once there, click on the “free access” tab and select the applicable year of NFPA 70 (National Electrical code).

2014 Code Language:

Here are the four new definitions:

Flash-Off Area. An open or enclosed area after a spray application process where vapors are released due to exposure to ambient air or a heated atmosphere. [33:3.3.1.1]

Limited Finishing Workstation. An apparatus that is capable of confining the vapors, mists, residues, dusts, or deposits that are generated by a spray application process and that meets the requirements of Section 14.3 of NFPA 33, Standard for Spray Application Using Flammable or Combustible Materials, but does not meet the requirements of a spray booth or spray room, as herein defined. [33:3.3.15.1]

Resin Application Area. Any area in which polyester resins or gelcoats are spray applied. [33:3.3.1.2]

Unenclosed Spray Area. Any spray area that is not confined by a limited finishing workstation, spray booth, or spray room, as herein defined. [33:3.3.2.3.2].

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Aticle 516. Spray Application, Dipping, Coating, and Printing Processes Using Flammable Combustible Materials.

Below is a Real Question from our Electrical Continuing Education Courses for Electrical License Renewal:

Which of the following is a flash off area?

A: A spray area that is not confined by a limited finishing workstation, spray booth, or spray room.
B: An enclosed area after a spray application process where vapors are released due to exposure to ambient air or a heated atmosphere.
C: An area where polyester resins are spray applied.
D: An area where gelcoats are spray applied.
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