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Section II – Introduction
Type 9 enclosures are for use indoors in locations classified as Class II,
Groups E, F, or G, as defined in the National Electrical Code.
• Group E – Atmospheres containing metal dust.
• Group F – Atmospheres containing carbon back, coal dust, or coke
dus
t.
• Group G – Atmospheres containing flour, starch, or grain dust.
Table 9. Conforming International Standard
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