Significance and Use
The dielectric breakdown voltage of the sleeving is of importance as a measure of its ability to withstand electrical stress without failure. This value does not correspond to the dielectric breakdown voltage expected in service, but is of value in comparing different materials or different lots, in controlling manufacturing processes or, when coupled with experience, for a limited degree of design work. The comparison of dielectric breakdown voltage of the same sleeving before and after environmental conditioning (moisture, heat, and the like) gives a measure of its ability to resist these effects. For a more detailed discussion, refer to Test Method D149.
1.1 These test methods cover procedures for testing electrical insulating sleeving comprising a flexible tubular product made from a woven textile fibre base, such as cotton, rayon, nylon, or glass, thereafter impregnated, or coated, or impregnated and coated, with a suitable dielectric material.
1.2 The procedures appear in the following sections:
|Brittleness Temperature||18 to 21|
|Compatibility of Sleeving with Magnet Wire Insulation||45 to 59|
|Dielectric Breakdown Voltage||12 to 17|
|Dielectric Breakdown Voltage After Short-Time Aging||29 to 33|
|Dimensions|| 7 to 11|
|Effect of Push-Back After Heat Aging||73 to 78|
|Flammability||22 to 28|
|Hydrolytic Stability||66 to 72|
|Oil Resistance||34 to 37|
|Selection of Test Material||5|
|Solvent Resistance||60 to 65|
|Thermal Endurance||38 to 44|
1.3 The values stated in inch-pound units, except for °C, are to be regarded as the standard. The values in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.4 This is a fire-test-response standard. See Sections 22 through 28, which are the procedures for flammability tests.
1.5 This standard measures and describes the response of 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.
1.6 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 and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see 45.2 and 63.1.1.
Note 1—This standard resembles IEC 60684-2, Specification for Flexible Insulating Sleeving—Part 2 Methods of Test, in a number of ways, but is not consistently similar throughout. The data obtained using either standard may not be technically equivalent.
1.7 Fire testing is inherently hazardous. Adequate safeguards for personnel and property shall be employed in conducting these tests.
45.1 These test methods evaluate the degrading effects, if any, of sleeving on magnet wire insulation.
45.2 Warning—These procedures include the hazardous operation of the use of glass test tubes in a heated oven.
66.1 This procedure evaluates the permanent effects of prolonged exposure to moisture at elevated temperatures by means of a visual and electrical test. It is limited to sizes of sleeving that can be conveniently conditioned in test tubes (about size 0 maximum). It is possible to evaluate larger sizes if chambers capable of maintaining the prescribed exposure conditions are available.
73.1 While possibly applicable to other types of sleeving of an elastomeric nature, this test method applies principally to silicone elastomer sleeving.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies
D374 Test Methods for Thickness of Solid Electrical Insulation
D471 Test Method for Rubber Property--Effect of Liquids
D746 Test Method for Brittleness Temperature of Plastics and Elastomers by Impact
D876 Test Methods for Nonrigid Vinyl Chloride Polymer Tubing Used for Electrical Insulation
D1711 Terminology Relating to Electrical Insulation
D2307 Test Method for Thermal Endurance of Film-Insulated Round Magnet Wire
D3487 Specification for Mineral Insulating Oil Used in Electrical Apparatus
D3636 Practice for Sampling and Judging Quality of Solid Electrical Insulating Materials
D5423 Specification for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation
D6054 Practice for Conditioning Electrical Insulating Materials for Testing
E145 Specification for Gravity-Convection and Forced-Ventilation Ovens
E176 Terminology of Fire Standards
IEC 60684-2 Specification for Flexible Insulating Sleeving--Part 2 Methods of Test Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
IEEE 101 Guide for the Statistical Analysis of Thermal Life Test Data Available from Institute of Electrical and Electronics Engineers, Inc. (IEEE), 445 Hoes Ln., P.O. Box 1331, Piscataway, NJ 08854-1331, http://www.ieee.org.
ac breakdown voltage; bending effects; brittleness temperature; coated textile sleeving; compatibility (magnet wire); flame resistance; flexible tubes; fluid resistance; heat aging; high humidity; hydrolytic stability; oil resistance; push-back; temperature index; thermal endurance; woven textile tubes; Brittleness temperature; Dielectric breakdown voltage; Electrical insulating solids; Flammability--electrical insulating materials; Magnet wire; Oil resistance--electrical insulating materials; Sleeves/sleeving; Thermal endurance--electrical insulating materials ;
ICS Number Code 29.035.20 (Plastic and rubber insulating materials)
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Citing ASTM Standards
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