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Protection Techniques

Each of the protection techniques mentioned above is permitted for use only in very specific applications. Example, components and equipment complying to the dust tight specification are approved for use in Class II, Division 2, or Class III, Division 1 or 2 locations, while those listed as explosion proof are approved for use in Class I, Division 1 or 2 locations.

 Often, those products listed for a higher classification surpass the requirements for lower classifications. In fact, the NEC® explicitly states “Equipment that has been identified for a Division 1 location shall be permitted in a Division 2 location of the same class, group and temperature class,” thereby complying with requirements for the Division 2 areas [ANSI/NFPA 70:500.8 (A)(2)]