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ASTM D495-99

(Test Method)

Standard Test Method for High-Voltage, Low-Current, Dry Arc Resistance of Solid Electrical Insulation

Standard Test Method for High-Voltage, Low-Current, Dry Arc Resistance of Solid Electrical Insulation

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1.1 This test method covers, in a preliminary fashion, the differentiation among similar materials with respect to their resistance to the action of a high-voltage, low-current arc close to the surface of insulation, intending to form a conducting path therein or in causing the material to become conducting due to the localized thermal and chemical decomposition and erosion.  
1.2 The 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 should not be used in material specifications. Whenever possible, alternative test methods should be used, and their development is encouraged.  
1.3 This test method will not, in general, permit conclusions to be drawn concerning the relative arc resistance rankings of materials that may be 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).  
1.4 The 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, the prediction of a material's relative performance in typical applications and in varying "clean to dirty" environments may 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 1-By 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.
1.5 While this test method uses dry, uncontaminated specimen surfaces, Test Method D2132, Test Method 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.  
1.6 This 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.  
1.7 The values stated in inch-pound units are to be regarded as the standard.
1.8 This 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.

General Information

Status
Historical
Publication Date
09-Mar-1999
ICS
29.035.01 - Insulating materials in general
Technical Committee
D09 - Electrical and Electronic Insulating Materials
Drafting Committee
D09.12 - Electrical Tests
Current Stage
Ref Project

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ASTM D495-99 - Standard Test Method for High-Voltage, Low-Current, Dry Arc Resistance of Solid Electrical InsulationASTM D495-99 - Standard Test Method for High-Voltage, Low-Current, Dry Arc Resistance of Solid Electrical Insulation
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ASTM D495-99 - Standard Test Method for High-Voltage, Low-Current, Dry Arc Resistance of Solid Electrical Insulation
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
An American National Standard
Designation:D495–99
Standard Test Method for
High-Voltage, Low-Current, Dry Arc Resistance of Solid
1
Electrical Insulation
This standard is issued under the fixed designation D 495; 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 (ε) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
it has been found possible to rearrange markedly the order of arc
1. Scope
resistance of a group of organic insulating materials consisting of
1.1 This test method covers, in a preliminary fashion, the
vulcanized fiber and of molded phenolic and amino plastics, some
differentiation among similar materials with respect to their
containing organic, and some inorganic, filler.
resistance to the action of a high-voltage, low-current arc close
1.5 While this test method uses dry, uncontaminated speci-
to the surface of insulation, intending to form a conducting
men surfaces, Test Method D 2132, Test Method D 2303, and
path therein or in causing the material to become conducting
Test Method D 3638 employ wet, contaminated specimen
due to the localized thermal and chemical decomposition and
surfaces. Their use is recommended for engineering purposes
erosion.
and to assist in establishing some degree of significance to this
1.2 The usefulness of this test method is very severely
2
test method for quality control purposes.
limited by many restrictions and qualifications, some of which
1.6 This test method is not applicable to materials that do
are described in the following paragraphs and in Section 5.
not produce conductive paths under the action of an electric
Generally, this test method should not be used in material
arc, or that melt or form fluid residues that float conductive
specifications. Whenever possible, alternative test methods
residues out of the active test area thereby preventing forma-
should be used, and their development is encouraged.
tion of a conductive path.
1.3 This test method will not, in general, permit conclusions
1.7 The values stated in inch-pound units are to be regarded
to be drawn concerning the relative arc resistance rankings of
as the standard.
materials that may be subjected to other types of arcs: for
1.8 This standard does not purport to address all of the
example, high voltage at high currents, and low voltage at low
safety concerns, if any, associated with its use. It is the
or high currents (promoted by surges or by conducting con-
responsibility of the user of this standard to establish appro-
taminants).
priate safety and health practices and determine the applica-
1.4 The test method is intended, because of its convenience
bility of regulatory limitations prior to use. For specific
and the short time required for testing, for preliminary screen-
precautionary statements, see 6.1.14, 6.1.19, Section 7, and
ing of material, for detecting the effects of changes in formu-
10.1.1.
lation, and for quality control testing after correlation has been
established with other types of simulated service arc tests and
2. Referenced Documents
field experience. Because this test method is usually conducted
2.1 ASTM Standards:
undercleananddrylaboratoryconditionsrarelyencounteredin 3
D 1711 Terminology Relating to Electrical Insulation
practice, the prediction of a material’s relative performance in
D 2132 Test Method for Dust-and-Fog Tracking and Ero-
typical applications and in varying “clean to dirty” environ- 4
sion Resistance of Electrical Insulating Materials
ments may be substantially altered (Note 1). Caution is urged
D 2303 Test Method for Liquid-Contaminant, Inclined-
against drawing strong conclusions without corroborating sup- 4
Plane Tracking and Erosion of Insulating Materials
port of simulated service tests and field testing. Rather, this test
D 3638 Test Method for Comparative Tracking Index of
method is useful for preliminary evaluation of changes in 4
Electrical Insulating Materials
structure and composition without the complicating influence
D 6054 Practice for Conditioning Electrical Insulating Ma-
of environmental conditions, especially dirt and moisture. 4
terials for Testing
NOTE 1—By changing some of the circuit conditions described herein
2
Also helpful is Test Method D 2302 for Wet Tracking Resistance of Electrical
1
This test method is under the jurisdiction of ASTM Committee D-9 on
Insulating Materials with Controlled Water-to-Metal Discharges. This test method
Electrical and Electronic Insulating Materials and is the direct responsibility of
was withdrawn and last appeared in the 1982 Annual Book of ASTM Standards, Part
Subco
...

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5.1 Some electrical properties, such as dielectric strength, vary with the thickness of the material. Determination of certain properties, such as relative permittivity (dielectric constant) and volume resistivity, usually require a knowledge of the thickness. Design and construction of electrical machinery require that the thickness of insulation be known.
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1.1 These test methods cover the determination of the thickness of several types of solid electrical insulating materials employing recommended techniques. Use these test methods except as otherwise required by a material specification.  
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6.1 Method—It is possible that electrical insulation in service will fail as a result of tracking, erosion, or a combination of both, if exposed to high relative humidity and contamination environments. This is particularly true of organic insulations in outdoor applications where the surface of the insulation becomes contaminated by deposits of moisture and dirt, for example, coal dust or salt spray. This test method is an accelerated test that simulates extremely severe outdoor contamination. It is believed that the most severe conditions likely to be encountered in outdoor service in the United States will be relatively mild compared to the conditions specified in this test method.  
6.2 Test Results—Materials can be classified by this test method as tracking-resistant, tracking-affected, or tracking-susceptible. The exact test values for these categories as they apply to specific uses will be specified in the appropriate material specifications, but guideline figures are suggested in Note 4. Tracking-resistant materials, unless erosion failure occurs first, have the potential to last many hundreds of hours (Note 5). Erosion, though it is possible that it will progress laterally, generally results in a failure perpendicular to the specimen surface. Therefore, compare only specimens of the same nominal thickness for resistance to tracking-induced erosion. Estimate the extent of erosion from measurements of the depth of penetration of the erosion. Place materials that are not tracking-susceptible in three broad categories—erosion-resistant, erosion-affected, and erosion-susceptible. When the standard thickness specimen is tested, the following times to failure typify the categories (Note 6):    
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1.1 This test method is intended to differentiate solid electrical insulating materials with respect to their resistance to the action of electric arcs produced by conduction through surface films of a specified contaminant containing moisture. Test Methods D2302, D2303, D3638, and D5288 are also useful to evaluate materials.  
1.2 Units—The values stated in SI units are the standard. The inch-pound units in parentheses are for information only. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
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ASTM D5424-23a(Test Method)
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SIGNIFICANCE AND USE
5.1 This test method provides a means to measure a variety of fire-test-response characteristics associated with smoke obscuration and resulting from burning the electrical insulating materials contained in electrical or optical fiber cables. The specimens are allowed to burn freely under well ventilated conditions after ignition by means of a propane gas burner.  
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5.5.1 The fire-test-response characteristics measured in this test method are a representation of the manner in which the specimens tested behave under certain specific conditions. Do not assume they are representative of a generic fire performance of the materials tested when made into cables of the construction under consideration.  
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1.1 This is a fire-test-response standard.  
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5.1 During operation of electrical equipment, including wires, resistors, and other conductors, it is possible for overheating to occur under certain conditions of operation, or when malfunctions occur. When this happens, a possible result is ignition of the adjacent insulation material.  
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1.1 This test method covers the minimum temperature required to ignite insulating materials using a glowing heat source. In a preliminary fashion, this test method differentiates between the susceptibilities of different materials with respect to their resistance to ignition due to an electrically-heated source.  
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1.4 This test method measures and describes the response or materials, products, or assemblies to heat and flame under controlled conditions, but does not by itself incorporate all factors required for fire hazard or fire risk assessment of the materials, products, or assemblies under actual fire conditions.  
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. (See IEEE/ASTM SI-10 for further details.)For specific precautionary statements, see Section 9.  
1.6 This 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements, see Section 9.  
1.7 Fire testing is inherently hazardous. Adequate safeguards for personnel and property shall be employed in conducting these tests.
Note 1: Although this test method and IEC 60695-2-12 differ in approach and in detail, data obtained to determine the glow-wire flammability index (GWFI) using either test method are technically similar. Although this test method and IEC 60695-2-13 differ in approach and in detail, data obtained to determine the glow-wire ignition temperature (GWIT) using either test method are technically similar.  
1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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SIGNIFICANCE AND USE
4.1 Ovens used for thermal evaluation of insulating materials are to be capable of maintaining uniform conditions of temperature and air circulation over the extended periods of time that are required for conducting these tests. Specification D5423 specifies the permissible variations from absolute uniformity that have been accepted internationally for these ovens. These test methods include procedures for measuring these variations and other specified characteristics of the ovens.
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1.1 These test methods cover procedures for evaluating the characteristics of forced-convection ventilated electrically-heated ovens, operating over all or part of the temperature range from 20 °C above the ambient temperature to 500 °C and used for thermal endurance evaluation of electrical insulating materials.  
1.2 These test methods are based on IEC Publication 60216-4-1, and are technically identical to it. This compilation of test methods and an associated specification, D5423, have replaced Specification D2436.  
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1.1 This terminology standard is a compilation of technical terms associated with testing and specifying solid electrical and electronic insulating materials.  
1.2 This terminology standard shall contain all definitions that are balloted specifically through Subcommittee D09.94 and through D09 main committee and that are of general interest to standards associated with electrical and electronic insulating materials. Those definitions shall be of importance to electrical and electronic insulating materials issues but need not be directly associated with a specific standard under the jurisdiction of Committee D09 on Electrical and Electronic Insulating Materials.  
1.3 It is intended that all definitions in this terminology standard originating in a specific standard under the jurisdiction of Committee D09 be identical to definitions of the same terms as printed in standards of originating technical subcommittees, with the exceptions of: (1) deletion of any part of the Discussion included in another standard that refers specifically to the use of a term in that standard; (2) figure numbers and corresponding references; and (3) in this terminology standard, a parenthetical addition of a reference to one or more technical standards in which the term is used and the year in which the term was added to this compilation.  
1.3.1 Definitions contained in this terminology standard which did not originate in a specific standard under the jurisdiction of Committee D09, or which originated in a standard that has since been revised or withdrawn, and that have been appropriately balloted, shall also be included in this terminology standard.  
1.4 It is permissible to include symbols as part of the representation of terms, where appropriate.  
1.5 It is not intended that this terminology standard include symbols (except as noted in 1.4). It is also permissible to include acronyms and abbreviations referring directly to defined terms.  
1.6 Revisions and additions to those definitions in this terminology standard which originate in a specific standard under the jurisdiction of Committee D09 are to be made as a product of a collaborative effort between Subcommittee D09.94 and the corresponding technical subcommittee of Committee D09, with Subcommittee D09.94 providing editorial advice to the technical subcommittees.  
1.7 Each definition in this terminology standard shall be accompanied by the year in which it was first incorporated into the standard, placed at the end in parentheses. All discussions shall also carry a date; it is possible that the discussion date is different from the definition date.  
1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ABSTRACT
This specification covers pressboard for electrical insulating purposes as well as for dielectrical or structural purposes in transformers and other electrical apparatus. Pressboards under this specification are of three types: Type 1 consists of high-purity (Grade 1.1) calendered pressboards, while Type 2 consists of normal-purity (Grades 2.1.1, 2.2.1, 2.3.1, and 2.3.2) calendered pressboards. Precompressed pressboards (Grades 3.1.1, 3.2.1, and 3.3) fall under Type 3. Not included in this specification, however, are pressboards comprised of two or more sheets laminated together using an adhesive. Pressboards shall be manufactured from unbleached kraft pulp, cotton pulp, or a combination of both, and shall conform to the thickness, density, surface texture (smooth calendered surface for Types1 and 2, and fine-textured finish for Type 3), and color (from tan to blue-gray, depending on the pressboard's grade) requirements specified. The pressboard must also be free of dirt, metal particles, and other foreign material. Tests for apparent density, thickness, moisture and ash content, aqueous extract conductivity, chloride content, tensile strength, pH of aqueous extract, dielectric strength in air and in oil, shrinkage, and compressibility shall be performed and shall conform to the requirements specified.
SCOPE
1.1 This specification covers pressboard for electrical insulating purposes, manufactured from kraft, cotton, or kraft and cotton pulps. This board is intended for dielectrical or structural purposes in transformers and other electrical apparatus.  
1.2 Electrical insulating boards are most commonly referred to (and will be referred to herein) as pressboard. Other terms used for pressboard include transformer board, fuller board, and presspan.  
1.3 This specification covers pressboard having a nominal thickness of 0.030 to 0.315 in. (0.8 to 8.0 mm). For thinner material refer to Specification D1305.  
1.4 The maximum thickness available will differ with the type and the manufacturer. The maximum sheet size will differ with the thickness, type, and manufacturer.  
1.5 Pressboard shall normally be plied wet without pasting. Unless specified by the purchaser, this specification does not include pressboard comprised of two or more sheets that have been laminated together using an adhesive.
Note 1: The materials described in this specification are similar to corresponding types of pressboard described in IEC Specification 641-3, Sheet 1, Types B.0.1, B.2.1, B.2.3, B.3.1, and B.3.3.  
1.6 The 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.  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM D3394-16(2022)(Test Method)
Standard Test Methods for Sampling and Testing Electrical Insulating Board

SIGNIFICANCE AND USE
19.1 Apparent density affects the dielectric and physical characteristics of insulating board and is a factor in the economics of its use in apparatus. This test is useful for specification, design, and quality control purposes.
SCOPE
1.1 These test methods cover the sampling and testing of electrical insulating boards. These boards are porous, usually fibrous sheets used for dielectric and structural purposes in electrical apparatus.  
1.2 These test methods are not intended for testing vulcanized fibre or molded laminated sheets.  
1.3 These test methods are applicable to board materials having a nominal thickness of at least 0.030 in. (0.76 mm).  
Note 1: For materials thinner than 0.030 in. (0.76 mm) see Test Methods D202.  
1.4 The test methods appear in the following sections:    
Sections  
ASTM Method
Reference  
Apparent Density  
18 – 23  
Aqueous Extract Characteristics  
36 – 42  
D202  
Ash Content  
43 – 46  
T 413  
Compatibility with Dielectric
Liquids  
47 – 52  
D664, D877, D924,
D971, D974, D1169,
D1500, D1816,
D3455, D3487  
Compressibility  
79 – 85  
Conditioning  
11  
D685  
Degree of Polymerization  
86 – 89  
D4243  
Dielectric Strength in Air  
53 – 59  
D149  
Dielectric Strength in Oil  
60 – 65  
D149, D2413, D3426  
Dimensions of Sheets  
12 – 17  
Moisture Content  
31 – 35  
D644  
Oil Absorption  
72 – 78  
Reports  
10  
Sampling  
6 – 9  
D3636  
Shrinkage  
24 – 30  
D644  
Tensile Properties  
66 – 71  
D202  
1.5 The 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.  
1.6 This 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 consult and establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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