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1.1 This test method covers the determination of the thermal endurance of electrical insulating varnishes alone or in combinations with wire insulation. Changes in the helical coil bond strength are used as the test criteria. The coils can be made from bare aluminum or copper wire, or from film- or fiber-insulated magnet wire.
1.2 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 a specific precautionary statement, see Section 7.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
Note—There is no similar or equivalent IEC standard.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D1711 Terminology Relating to Electrical Insulation
D1932 Test Method for Thermal Endurance of Flexible Electrical Insulating Varnishes
D2307 Test Method for Thermal Endurance of Film-Insulated Round Magnet Wire
D2519 Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Coil Test
D3251 Test Method for Thermal Endurance Characteristics of Electrical Insulating Varnishes Applied Over Film-Insulated Magnet Wire
D5423 Specification for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation
International Electrotechnical Commission PublicationsIEC 60216-1 Guide for the Determination of Thermal Endurance Properties of Electrical Insulation Materials (Part 1)
ICS Number Code 29.035.60 (Varnished fabrics)
UNSPSC Code 31211707(Varnishes); 26121500(Electrical wire)
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ASTM D3145-03, Standard Test Method for Thermal Endurance of Electrical Insulating Varnishes by the Helical Coil Method, ASTM International, West Conshohocken, PA, 2003, www.astm.orgBack to Top