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ASTM D 495 : 2014

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Standard Test Method for High-Voltage, Low-Current, Dry Arc Resistance of Solid Electrical Insulation
Available format(s)

Hardcopy , PDF

Superseded date

02-28-2022

Language(s)

English

Published date

05-12-2014

CONTAINED IN VOL. 10.01, 2015 Defines preliminary fashion, the differentiation of similar materials' resistance to the action of a high-voltage, low-current arc close to the surface of insulation, when a conducting path is formed causing the material to become conducting due to the localized thermal and chemical decomposition and erosion.

1.1This test method covers, in a preliminary fashion, the differentiation of similar materials’ resistance to the action of a high-voltage, low-current arc close to the surface of insulation, when a conducting path is formed causing the material to become conducting due to the localized thermal and chemical decomposition and erosion.

1.2The usefulness of this test method is very severely limited by many restrictions and qualifications, some of which are described in the following paragraphs and in Section 5. Generally, this test method shall not be used in material specifications. Whenever possible, alternative test methods shall be used, and their development is encouraged.

1.3This test method will not, in general, permit conclusions to be drawn concerning the relative arc resistance rankings of materials that are potentially subjected to other types of arcs: for example, high voltage at high currents, and low voltage at low or high currents (promoted by surges or by conducting contaminants).

1.4The test method is intended, because of its convenience and the short time required for testing, for preliminary screening of material, for detecting the effects of changes in formulation, and for quality control testing after correlation has been established with other types of simulated service arc tests and field experience. Because this test method is usually conducted under clean and dry laboratory conditions rarely encountered in practice, it is possible that the prediction of a material's relative performance in typical applications and in varying “clean to dirty” environments will be substantially altered (Note 1). Caution is urged against drawing strong conclusions without corroborating support of simulated service tests and field testing. Rather, this test method is useful for preliminary evaluation of changes in structure and composition without the complicating influence of environmental conditions, especially dirt and moisture.

Note 1By changing some of the circuit conditions described herein it has been found possible to rearrange markedly the order of arc resistance of a group of organic insulating materials consisting of vulcanized fiber and of molded phenolic and amino plastics, some containing organic, and some inorganic, filler.

1.5While this test method uses dry, uncontaminated specimen surfaces, Test Method D2132, Test Methods D2303, and Test Method D3638 employ wet, contaminated specimen surfaces. Their use is recommended for engineering purposes and to assist in establishing some degree of significance to this test method for quality control purposes.2

1.6This test method is not applicable to materials that do not produce conductive paths under the action of an electric arc, or that melt or form fluid residues that float conductive residues out of the active test area thereby preventing formation of a conductive path.

1.7The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.8This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements, see 6.1.14, 6.1.19, Section 7, and 10.1.1.

Committee
D 09
DocumentType
Test Method
Pages
10
PublisherName
American Society for Testing and Materials
Status
Superseded
SupersededBy
Supersedes

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ASTM D 3638 : 2021 Standard Test Method for Comparative Tracking Index of Electrical Insulating Materials
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ASTM D 1711 : 2014 : REV A Standard Terminology Relating to Electrical Insulation
ASTM D 3638 : 1993 : R1998 Standard Test Method for Comparative Tracking Index of Electrical Insulating Materials
ASTM D 1711 : 2015 Standard Terminology Relating to Electrical Insulation
ASTM D 1711 : 2014 Standard Terminology Relating to Electrical Insulation
ASTM D 2132 : 2019 Standard Test Method for Dust-and-Fog Tracking and Erosion Resistance of Electrical Insulating Materials
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ASTM D 1711 : 2020 Standard Terminology Relating to Electrical Insulation
ASTM D 1711 : 2008 Standard Terminology Relating to Electrical Insulation
ASTM D 2132 : 2011 Standard Test Method for Dust-and-Fog Tracking and Erosion Resistance of Electrical Insulating Materials
ASTM D 2132 : 2012 : R2018 Standard Test Method for Dust-and-Fog Tracking and Erosion Resistance of Electrical Insulating Materials
ASTM D 2132 : 1998 Standard Test Method for Dust-and-Fog Tracking and Erosion Resistance of Electrical Insulating Materials
ASTM D 6054 : 1997 : R2004 Standard Practice for Conditioning Electrical Insulating Materials for Testing (Withdrawn 2012)
ASTM D 2303 : 2020 Standard Test Methods for Liquid-Contaminant, Inclined-Plane Tracking and Erosion of Insulating Materials

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