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Test Equipment for Use in Determining Classifications of Combustible Dusts (1979) / Chapter Skim
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Chapter 1: Summary and Recommendations
Pages 1-4

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From page 1...
... Coast Guard by the NRC Committee on Hazardous Materials,{ a method to classify flammable gases and vapors had been established and this method was used by the NMAB committee to prepare a matrix of combustion-relevant properties and classifications of gases, vapors, and selected solids.2 It appeared that no system for classifying the identified combustible dusts was available, but a review by the committee of the few dusts classified in Class II, Groups E, F and G of NEC Article 500 indicated that the layer ignition temperature and the electrical conductivity of the dusts were the crucial factors.
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From page 2...
... 4. The thermal insulating properties of a dust will have some ef feet on the surface temperature of the electrical equipment on which it collects, particularly equipment that generates cons iderable heat such as lighting f ixtures and motors.
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From page 3...
... 3. Recommend the test methods to be used to classify the identified combustible dusts according to the groups given in NEC Article 500.
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From page 4...
... The panel initially considered methods of testing for thermaT/oxidative stability as well as layer ignition temperature and electrical resistivity. A review of the literature disclosed several different techniques for the deter:mination of long-term stability, including thermogravimetric analysis, an active oxygen method, a modified ASTM oxygen bomb method, differential scanning calorimetry, and pressure differential scanning calorimetry.
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Key Terms

  • layer ignition
  • electrical resistivity
  • ignition temperatures
  • cloud ignition
  • combustible dusts

  • nec article
  • moisture content
  • temperature test
  • differential scanning
  • electrical equipment

  • scanning calorimetry
  • identified combustible
  • ignition properties
  • methods presently
  • evaluate methods

  • major effect
  • dusts classified
  • crucial factors
  • specific test
  • proposed international

  • metal dusts
  • oxygen method
  • thermogravimetric analysis
  • conductive dusts
  • cons iderable

  • dusts according
  • highly conductive
  • plate method
  • typical example
  • insulating properties


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