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

Zone Classification

Summary

Zone Classification

Zone classification is an alternative method of classifying hazardous areas. Most significantly, the zone classification method provides some protection methods that are different from those used in areas classified by division.
Zones 0 and 1 combined are approximately equivalent to Division 1 and Zone 2 is equivalent to Division 2.
Because Zone 0 includes the highest-risk areas of Division 1, the remaining areas of Zone 1 may use protection methods that may not be suitable for Division 1 areas.
The wiring methods used in zone-classified areas are mostly the same as those used in division-classified areas.
Some of the alternative protection methods include flameproof, encapsulated, powder-filled, and increased safety.
The permitted methods may be suitable for Zone 0, 1 and 2, Zone 1 and 2, or only Zone 2.
Sealing requirements in zones are also essentially the same as for division-classified areas with the exception of specific requirements for flameproof and encapsulated equipment.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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