PDFWAC 296-818-40010
Explosion venting and wiring.
You must follow the requirements in Table-3 for flammable or combustible dust mixtures.
Table-3: Explosion Venting and Wiring
If you have | Then |
Flammable or explosive dust mixtures that may be present | Make sure the construction of equipment, including the exhaust system and all electrical wiring, meets both of the following: |
• The American National Standard Installation (ANSI) of Blower and Exhaust Systems for Dust, Stock, and Vapor Removal or Conveying, NFPA 91. 2004. | |
• The electrical requirements for Class II locations in WAC 296-24-95613, located in Part L of chapter 296-24 WAC. | |
Make sure blast cleaning enclosures, the ducts, and the dust collector are constructed with either loose panels or explosion venting areas that meet all of the following: | |
• Provides pressure relief in case of an explosion. | |
• Are located away from occupied areas. | |
• The Guide for Deflagations, NFPA 68. 2002. |