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. |