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

Zone Classification

From NEC Section 505.7(B)

(B) Dual Classification. In instances of areas within the same facility classified separately, Class I, Zone 2 locations shall be permitted to abut, but not overlap, Class I, Division 2 locations. Class I, Zone 0 or Zone 1 locations shall not abut Class I, Division 1 or Division 2 locations.

The area immediately adjacent to a Zone 0 area is generally Zone 1, and the area immediately adjacent to a Zone 1 area is generally Zone 2, and these classifications cannot be replaced by division-classified areas, thus Division 1 or 2 areas may not abut Zone 0 or 1 areas
NOTE: This is an unformatted excerpt from our online fire protection training library.

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