Причина отменыThese test methods cover procedures for the testing of varnished cotton fabrics and varnished cotton fabric tapes 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.

Formerly under the jurisdiction of Committee D09 on Electrical and Electronic Insulating Materials, these test methods were withdrawn in March 2020. This standard is being withdrawn without replacement because it is no longer being maintained..

Значение и использование

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.

Область применения

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:

Procedures	Sections	ASTM Test Methods
Breaking Strength	20 to 27	...
Conditioning Dielectric Breakdown Voltage	5 43 to 46	... D149
Dielectric Breakdown Voltage Under Elongation	47 to 53	D149
Dissipation Factor and Permittivity	54 to 60	D150
Elongation Resistance to Oil	35 to 42 68 to 73	... D92
Selection of Test Specimens	4	...
Tear Resistance	28 to 34	D689
Thickness	6 to 10	D374
Thread Count	15 to 19	...
Volume Resistance	61 to 67	D257
Weight	11 to 14	...

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