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Identifying Materials & Equipment

Combustible Dusts

Type of Dusts

The NEC is concerned with reducing fire hazards due to combustible dusts by ensuring that the electrical system will not be an ignition source. Most organic dusts are combustible, and some such dusts are present in virtually all occupancies. For example, flour, cocoa, and dehydrated milk are common combustible dusts, but they are seldom present in ignitible quantities where they are used. Even where they could be ignited, there is usually not enough dust present to sustain or spread a flame. The only areas that are considered to be Class II hazardous (classified) areas are those areas where large amounts of combustible dust will be in the air Typically ignitible dust clouds will be too dense to see through and special breathing apparatus would be required. or accumulate on surfaces Typically, accumulations on surfaces will obscure the color of the surfaces and the dust will form a visible layer of dust within 24 hours., especially on electrical equipment Electrical equipment used in Class II areas must generally exclude ignitible amounts of combustible dust from the interior of enclosures, prevent arcs or sparks inside the enclosures from igniting dusts on the outside of enclosures, and prevent dust accumulations or dust clouds from being ignited by high surface temperatures on enclosures..
NOTE: This is an unformatted excerpt from our online fire protection training library.

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