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

Classification Basics

A Class II, Division 2 location is a location
(1) In which combustible dust due to abnormal operations may be present in the air in quantities sufficient to produce explosive or ignitible mixtures; or 

(2) Where combustible dust accumulations are present but are normally insufficient to interfere with the normal operation of electrical equipment or other apparatus, but could as a result of infrequent malfunctioning of handling or processing equipment become suspended in the air; or

(3) In which combustible dust accumulations on, in, or in the vicinity of the electrical equipment could be sufficient to interfere with the safe dissipation of heat from electrical equipment, or could be ignitible by abnormal operation or failure of electrical equipment.
     (FPN No. 1):  The quantity of combustible dust that may be present and the adequacy of dust removal systems are factors that merit consideration in determining the classification and may result in an unclassified area.

       (FPN No. 2):   Where products such as seed are handled in a manner that produces low quantities of dust, the amount of dust deposited may not warrant classification.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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