CLASS II--DUST CLASSIFICATION

Tentative ISA Recommended Practices SP12.10 and SP12.11 propose classifying Class II dusts based on specific resistances of the materials. Test results show that Group F materials (carbon black, coal, coke) are essentially non-conductors--even when wet. It would seem logical to place these high resistance materials in Group G rather than treat them the same as the metallic dusts in Group E. The National Electrical Code separates dusts into groups based on electrical conductivity. A method is proposed whereby electrical conductivity can be measured permitting the proper grouping of materials not previously listed. Test results suggest that carbon-based dusts more nearly resemble the non-conductive dusts than the metal dusts and should be regrouped.

• Supplemental Notes:
  • Presented at training session sponsored by Wilmington Section of the Instrument Society of America, Appeared in "Electrical Safety Practices", Monograph #113.
• Corporate Authors:

  Instrument Society of America

  400 Stanwix Street
  Pittsburgh, PA  United States  15222
• Authors:
  • Moodie, T W
• Publication Date: 1971-11

Media Info

• Pagination: p. 87-89
• Serial:
  • Publication of: American Chemical Society
  • Publisher: American Chemical Society

Subject/Index Terms

• TRT Terms: Electrical equipment; Hazards; Safety; Standards
• Uncontrolled Terms: Safety standards
• Old TRIS Terms: Electrical equipment hazard; Electrical equipment standards
• Subject Areas: Marine Transportation; Safety and Human Factors;

Filing Info

• Accession Number: 00054206
• Record Type: Publication
• Source Agency: Instrument Society of America
• Files: TRIS
• Created Date: May 7 1974 12:00AM