Unclassified

Purex Technical Manual, HW-31000 (unclassified). United States Department of Energy, Washington, D.C., 1955. 

R. E. Fleming, M Compilation of Physical and Chemical Properties of Materials and Streams Encountered in the Chemical Processing Department, HW-57386 (unclassified), U.S. Dept, of Energy, Washington, D.C., 1958. 

Kemamine Q9702C Humko Chemical Unclassified quaternary ammonium compound... 

Sources Subject to Prevention of Significant Deterioration (PSD) Sources subject to PSD regulations (40 CFR, Sec. 52.21, Aug. 7, 1980) are major stationary sources and major modifications located in attainment areas and unclassified areas. A major stationaiy source was defined as any source hsted in Table 25-4 with the potential to emit 100 tons per year or more of any pollutant regulated under the Clean Air Act (CAA) or any other source with the potential to emit 250 tons per year or more of any CAA pollutant. The potential to emit is defined as the maximum capacity to emit the pollutant under apphcable emission standards and permit conditions (after apphcation of any air pollution control equipment) excluding secondaiy emissions. A major modification is defined as any physical or operational change of a major stationaiy source producing a significant net emissions increase of any CAA pollutant (see Table 25-5). 

Group 3 The agent (mixture, or exposure circumstance) is unclassifiable as to carcinogenicity in humans. 

Phenol formaldehyde. Eormaldehyde is a respiratory irritant but is not classified as asthmagen. Powder coatings containing triglycidyl isocyanurate are possible asthmagens (unclassified)... 

Unclassified explosives carried solely in connection with an application for their classification. 

Many accidents have occurred where gas has migrated through the drain system to an unclassified area where welding, or other hot work, was being performed. See Chapter 15. 

Batteries should normally be installed in an unclassified area. However, if installed in Division 2 areas, a suitable disconnect switch must be installed to disconnect the load prior to removing the battery leads and tlius avoid a spark if the battery leads are disconnected under load conditions. Batteries should not be installed in Division 1 areas. 

Chargers are normally installed in unclassified areas. However, it is possible to purchase a charger suitable for installation in a classified area. 

Hermetically sealed devices are devices sealed to prevent flammable gases from reaching enclosed sources of ignition. These devices are suitable for use in Division 2 and unclassified areas. 

A nonincendive device is one which will not release sufficient energy under normal operating conditions to ignite a specific substance. Under abnormal conditions, such as a malfunction of the device, it may release enough energy to cause ignition. Because of this, such devices are suitable for use only in Division 2 and unclassified areas. 

The mere fact that voltage, current, or even both, are at low levels does not guarantee a circuit to be intrinsically safe, even though intrinsically safe circuits do utilize relatively low voltage and current levels. Intrinsically safe systems employ electrical barriers to assure that the system remains intrinsically safe. The barriers limit the voltage and current combinations so as not to present an ignition hazard should a malfunction develop. Typically, devices upstream of barriers are not intrinsically safe and are installed in control rooms or other unclassified locations. All devices and wiring on the downstream side of the barriers are intrinsically safe and can be installed in classified areas. 

Cables without a continuous gas/vapor-tight sheath must be sealed at classified-unclassified area boundaries. 

Unclassified refrigerants indicate either insufficient data to classify or no formal request for classification. ... 

FPN No. 1) The quantity of combustible dust that may be present and the adequacy of dust removal systems are factors that merit consideration in determining the classification and may result in an unclassified area. 

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