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

Zone Classification

Special Considerations

Dual Classification

Where some areas are to be classified by zone and others by division, the NEC restricts the locations that may abut each other. An area that is classified because of a single source of vapor or gas must be classified under only one method and cannot overlap an area that is classified by the other method. However, two areas may be classified under different methods if they do not overlap and meet the other restrictions of Section 505.7(B).
NOTE: This is an unformatted excerpt from our online fire protection training library.

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