Wash. Admin. Code § 296-818-40010
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. |
Wash. Admin. Code § 296-818-40010
Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. 06-12-074, § 296-818-40010, filed 6/6/06, effective 9/1/06.