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In Class I locations, an installation must be classified as using the division classification system meeting paragraphs (c), (d), (e), and (f) of this section or using the zone classification system meeting paragraph (g) of this section. In Class II and Class III locations, an installation must be classified using the division classification system meeting paragraphs (c), (d), (e), and (f) of this section.

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1910.307(a)(4) Electrical, Division and Zone Classification
In Class I locations, an installation must be classified as using the division classification system meeting paragraphs (c), (d), (e), and (f ...
1910.307(g)(5) Electrical, Listing and Marking
Equipment that is listed for a Zone 0 location may be installed in a Zone 1 or Zone 2 location of the same gas or vapor. Equipment that is listed ...
1910.106(f)(5)(iii) Hazardous Materials, Classification
classifications listed shall be based on the premise that the installation meets the applicable requirements of this section in all respects ...