ASTM D3283-98

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D 3283 – 98
Standard Specification for
Air as an Electrical Insulating Material
This standard is issued under the fixed designation D 3283; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
A
TABLE 1 Composition and Properties for Air
1. Scope
Type I
1.1 This specification applies to air used as an electrical
Oxygen, volume % 19.5 to 23.5
insulating material in electrical equipment.
Carbon monoxide, max, volume % 0.0020
1.2 This standard does not purport to address all of the
Carbon dioxide, max, volume % 0.10
safety concerns, if any, associated with its use. It is the
Nitrogen predominantly balance
Dew point, max, °C −58
responsibility of the user of this standard to establish appro-
A
priate safety and health practices and determine the applica- By agreement between purchaser and manufacturer, analysis may be required
and limits established for elements or compounds not specified in the table of
bility of regulatory limitations prior to use.
chemical composition.
2. Referenced Documents
2.1 ASTM Standards:
appropriate pressure reducing regulator. Screw the pressure
D 2029 Test Methods for Water Vapor Content of Electrical
2 regulator inlet connection on to the container valve outlet.
Insulating Gases by Measurement of Dew Point
3 Connect the regulator outlet connection to the gas sampling
E 105 Practice for Probability Sampling of Materials
pipe or to the gas analyzing equipment by means of metal or
E 260 Practice for Packed Column Gas Chromatography
glass tubing except that rubber tubing may be used to secure
2.2 Other Documents:
4 butt joints in metal-to-glass or glass-to-glass tubing. Take care
Specification G-7.1 Commodity Specification for Air
to ensure that all tubing is clean and dry and the sampling
apparatus is thoroughly purged of atmospheric air before the
3. Classification
sample is taken. Where a multiplicity of containers are to be
3.1 This specification shall apply to Type I, gaseous air.
sampled, follow Practice E 105 if it is considered satisfactory
4. Manufacture to sample less than the total number of containers.
4.1 This specification applies to both atmospheric air and to
7. Test Methods
air synthesized by blending oxygen an
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