Electrical apparatus for use in the presence of combustible dust - General requirements Ingestion-build-73935 4 Specification of categories of

4 Specification of categories of cabs

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• IEC TR 61850-90-3

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Electrical apparatus for use in the presence of combustible dust - General requirements Ingestion-build-73935 4 Specification of categories ofMany dusts that are generated, processed, handled and stored are combustible. When ignited they can burn rapidly and with considerable explosive force if mixed with air in the appropriate proportions. When electrical apparatus is used in locations where combustible materials are present, it is important that suitable precautions are taken. In electrical apparatus, potential ignition sources include electrical arcs and sparks, hot surfaces and