Explosion-Proof Housings

  • Ernest C. Magison


The use of explosion-proof housings is based on recognition of the fact that in many types of electrical equipment the amount of energy transferred to a combustible mixture during normal operation of the equipment or during probable and nonpreventable faults cannot in any way be reduced below that required for ignition. One way in which such equipment can be used safely in a hazardous location is to provide an enclosure so constructed that, if ignition does occur around the equipment, the flame cannot propagate outside the enclosure and spread to the surrounding atmosphere. For the enclosure to perform this function it must contain the internal explosion without damage and cool any gases which escape so that they cannot ignite a flammable mixture surrounding the enclosure.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Underwriters’ Laboratories, Inc., Standards for Safety No. 698, “Industrial Control Equipment for Use in Hazardous Locations,” 6th Edition, December 1949.Google Scholar
  2. 2.
    National Electrical Code, Articles 500 ff.Google Scholar
  3. 3.
    Canadian Standards Association, Standard C130–1963, “Explosion-Proof Enclosures for Electrical Equipment.”Google Scholar
  4. 4.
    British Standard 229:1957: “Flameproof Enclosure of Electrical Apparatus.”Google Scholar
  5. 5.
    Phillips, H., “A Reaction Rate Theory for Flameproof Enclosures,” IEE Paper No. 3902M, IEE Conference Report Series No. 3.Google Scholar
  6. 6.
    “A Review of Electrical Research and Testing with regard to Flameproof Enclosure and Intrinsic Safety of Electrical Apparatus and Circuits,” Ministry of Fuel and Power, 1943, London.Google Scholar
  7. 7.
    Matson, E. F., R. E. DuFour, and W. C. Westerberg, “An Investigation of Large Electric Motors and Generators of the Explosion-Proof Type For Hazardous Locations, Class I, Group D,” Bulletin of Research No. 46, Underwriters’ Laboratories, Inc., September 1951.Google Scholar
  8. 8.
    British Symposium on Flameproofing and Intrinsic Safety, 1962, IEE Conference Report Series No. 3, Discussion, p. 59.Google Scholar
  9. 9.
    Lewis, B., and G. Von Elbe, “Combustion Flames and Explosions of Gases,” 2nd Edition, Chapter VIII, Academic Press, New York, 1961.Google Scholar
  10. 10.
    Kisselstein, C. F., “Explosion-Proof Enclosures; Design, Tests, and Maintenance,” Proceedings of 1960 Symposium on Safety for Electrical Instrumentation in Hazardous Areas, ISA, Pittsburgh.Google Scholar

Copyright information

© Springer Science+Business Media New York 1966

Authors and Affiliations

  • Ernest C. Magison
    • 1
  1. 1.Honeywell Inc.Fort WashingtonUSA

Personalised recommendations