Explosive Dust Area Classifications

- Aug 24, 2017-

Class II, Division 1 classified locations
An area where ignitable concentrations of combustible dust can exist all of the time or some of the time under normal operating conditions.

Class II, Division 2 classified locations
An area where ignitable concentrations of combustible dust are not likely to exist under normal operating conditions.

Class III, Division 1 classified locations
An area where easily ignitable fibers or materials producing combustible flyings are handled, manufactured or used.

Class III, Division 2 classified locations
An area where easily ignitable fibers are stored or handled.

Zone 20 classified locations
An area where ignitable concentrations of combustible dust or ignitable fibers/flyings are present continuously or for long periods of time under normal operating conditions.

Zone 21 classified location
An area where ignitable concentrations of combustible dust or ignitable fibers/flyings are likely to exist under normal operating conditions.

Zone 22 classified locations
An area where ignitable concentrations of combustible dust or ignitable fibers/flyings are not likely to exist under normal operating conditions.

Unclassified locations
Also known as non-hazardous or ordinary locations, these locations are determined to be neither Class II, Division 1 or Division 2; Class III, Division 1 or Division 2; Zone 20, Zone 21 or Zone 22; or any combination thereof.