Tuesday, July 3, 2012

NEMA Type 9 Enclosures Only for Class II Hazardous Locations?

Currently NEMA only defines Type 9 Enclosures for Class II Hazardous Locations. In contrast, Dusttight enclosures are referenced in NEMA 250 solely for Nonhazardous Locations.(Table 1) This conflicts with NFPA 70 Articles 500 & 502 in addition to the OSHA HazLoc regulation 1910.307 where dusttight enclosures are compliant in Class II Division 2 HazLoc.

Would clarification in future revisions of NEMA 250 assist stakeholders in providing consistency with NFPA 70 Articles 500 & 502 and the OSHA HazLoc regulation regarding dusttight enclosures in Class II Division 2 HazLoc?

NEMA Enclosures for Nonhazardous & Hazardous Locations

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