Hazardous Locations - Class II, Division 1

Dust explosive atmospheres are common and dangerous. The hazards posed by explosive dusts should not be underestimated! These hazards exist wherever dusts are present during storage, conveying, processing, and handling of materials that generate them.

In North America, there are two systems used to classify or group hazardous locations: the Class-division system and the Zone System. Locations that are hazardous because of the presence of dust are defined in the Zone system as Zones 20, 21 and 22. In the Class-division system they are Class II, Division 1, and Class II Division 2.

In this animation, we will focus on the Class-division system classification of dust explosive atmospheres, specifically Class II, Division 1. We have made a separate video about Class II, Division 2 if you want to learn more about that classification.
Class II, Division 1 is defined as a location in which combustible and explosive dusts are in the air under normal operating conditions and in quantities sufficient to produce explosive or ignitable mixtures.

The three Dust Groups E, F and G in North America further define dusts as follow: Group E combustible metal dusts, Group F combustible dusts that are not metal, and Group G solid particles including fibres. If there is conductive metal dust in the area, for example, then the entire area where the dust may collect is considered to be Division 1.

If you are a product designer, or a buyer, and need an electrical device that has been certified for Class II Division 1, the Hazloc Directory website can help!

Hazloc Directory is the world's most trusted source of information about hazardous location products & manufacturers.

Please visit our website at www.hazlocdirectory.com

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