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NOTE: This is an unformatted excerpt from our online fire protection training library.

Zone Classification

Special Cases

Seals are not required at enclosures that are factory sealed and at some enclosures where arcing or heat-producing devices are hermetically sealed or immersed in oil. One seal may be used for more than one explosionproof enclosure if properly located within 18 inches of both enclosures, but a factory sealed enclosure may not be used to seal another enclosure.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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