ElectricalSince dust will be excluded from properly installed systems in Class II areas, seals are not required at the boundaries of the Class II areas, nor are they ... Note that where a horizontal raceway extends 10 ft (3.0 m) or more from the enclosure, a seal is not required. ... Table 4.5.2 in NFPA 499-2008, RecommendedPracticefor the Classification of Combustible Dusts and of Hazardous (Classified) Locationsanbsp;...
|Title||:||Electrical Inspection Manual 2011|
|Author||:||Noel Williams, Jeffrey S. Sargent|
|Publisher||:||Jones & Bartlett Publishers - 2010-11-30|