Log In Sign Up

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

Special Occupancies

Hazardous Occupancies

Class, Division and Zone

Articles 500 through 506 address areas that are considered hazardous – also called classified"Hazardous" is often used, but "classified" is the more technically correct term. – locations, based on flammable or combustible materials that are or may be present. These classifications are found in Section 500.1, the scope statement, and are very similar to the zone classification system found in Articles 505 and 506.

Class designation is based on the presence of hazardous material: Class I – flammable gases, flammable liquid-produced vapors, combustible liquid-produced vapors
Class II – combustible dusts Class III – ignitable fibers/flyings

Division and Zone designations (Division 1 or 2; Zone 0, 1, 2, 20, 21 or 22) are based are based on the likelihood that classified material will be present in an ignitable form.

In addition, the specific chemical characteristics of the materials in Class I and Class II areas are used to specify the Group. For example, gasoline will often produce an area classification of Class I, Division 1 or 2, Group D.

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

Contact Us:

Please fill in the fields below:

    Privacy Policy
    Please choose all that interest you.

    Contact Customer Service at AcademySupport@jensenhughes.com or 800-930-9414 option 1.

    Our regular support hours are 9:00 AM to 5:00 PM, Monday through Friday, except holidays...