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Standard Test Methods for Varnished Cotton Fabrics Used for Electrical Insulation (Withdrawn 2020)
Automaticky přeložený název:
Standardní zkušební metody pro lakované bavlněné tkaniny pro elektrické izolace
NORMA vydána dne 15.1.2012
Označení normy: ASTM D295-12
Poznámka: NEPLATNÁ
Datum vydání normy: 15.1.2012
Kód zboží: NS-22060
Počet stran: 11
Přibližná hmotnost: 33 g (0.07 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
breaking strength, dielectric breakdown voltage, dissipation factor, permittivity, tear resistance (internal), thread count, varnished cotton fabric, volume resistance, ICS Number Code 29.035.99 (Other insulating materials)
Significance and Use | ||||||||||||||||||||||||||||||||||||
The thickness test is necessary to determine whether the material meets specified tolerances for thickness. In addition, thickness values are essential because of the importance of space factor in designing electrical equipment. |
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1. Scope | ||||||||||||||||||||||||||||||||||||
1.1 These test methods cover procedures for the testing of varnished cotton fabrics and varnished cotton fabric tapes (Note 1) to be used as electrical insulation and are directly applicable to both “straight-cut” and “bias-cut” materials, unless otherwise stated in the test method. Note 1—Methods of testing varnished glass fabrics and tapes are given in Test Methods D902. 1.2 The procedures appear in the following order:
1.3 The values stated in inch-pound units are to be regarded as the standard. The metric equivalents of inch-pound units may be approximate. 1.4 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 44.4, 51.1, 58.1, and 65.1. Note 2—This standard resembles IEC 60394–2 in title only. The content is significantly different. ^REFERENCE:ASTM Standards: D92 Test Method for Flash and Fire Points by Cleveland Open Cup Tester D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies D150 Test Methods for AC Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical Insulation D257 Test Methods for DC Resistance or Conductance of Insulating Materials D374 Test Methods for Thickness of Solid Electrical Insulation D689 Test Method for Internal Tearing Resistance of Paper (Withdrawn) D902 Test Methods for Flexible Resin-Coated Glass Fabrics and Glass Fabric Tapes Used for Electrical Insulation D1711 Terminology Relating to Electrical Insulation IEC Standard: IEC 60394–2 Varnished Fabrics for Electrical Purposes Part 2: Methods of Test |
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2. Referenced Documents | ||||||||||||||||||||||||||||||||||||
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