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

Classification Basics

Classification Terminology

Class II Areas

Class II areas are classified due to the presence of combustible dusts combustible dusts
Combustible dusts include dusts produced in the handling and processing of grain and grain products, pulverized sugar and cocoa, dried egg and milk powders, pulverized spices, starch and pastes, potato and wood-flour, oil meal from beans and seed, dried hay, and other organic materials that may produce combustible dusts when processed or handled. Electrically conductive dusts, usually metal dusts, are much more hazardous than nonconductive dusts. Dusts containing magnesium or aluminum are particularly hazardous, and the use of extreme precaution is necessary to avoid ignition and explosion. that may be in suspension in the air or may accumulate on equipment accumulate on equipment
Dusts that accumulate on equipment may become carbonized or excessively dry which may make them more susceptible to spontaneous ignition. Such accumulations also tend to entrap heat and make the situation worse. The accumulation of dust on equipment and flat areas is also a problem because in the event of a small primary explosion, frequently with disasterous consequences..
NOTE: This is an unformatted excerpt from our online fire protection training library.

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