ASTM D2307-07
(Test Method)Standard Test Method for Thermal Endurance of Film-Insulated Round Magnet Wire
Standard Test Method for Thermal Endurance of Film-Insulated Round Magnet Wire
SCOPE
1.1 This test method covers determination of the thermal endurance of film-insulated round magnet wire in air at atmospheric pressure. It is not applicable to magnet wire with fibrous insulation, such as cotton or glass.
1.2 The values stated in inch-pound units are to be regarded as the standard. The SI units in parentheses are provided for information only.
1.3 This test method covers the evaluation of thermal endurance by observing changes in response to ac proof voltage tests. The evaluation of thermal endurance by observing changes in other properties of magnet wire insulation requires the use of different test methods.
1.4 It is possible that exposure of some types of film insulated wire to heat in gaseous or liquid environments in the absence of air will give thermal endurance values different from those obtained in air. Consider this possibility when interpreting the results obtained by heating in air with respect to applications where the wire will not be exposed to air in service.
1.5 It is possible that electric stress applied for extended periods at a level exceeding or even approaching the discharge inception voltage will change significantly the thermal endurance of film insulated wires. Under such electric stress conditions, it is possible that comparisons between materials will also differ from those developed using this method.
1.6 This test method is similar to IEC 60172. Differences exist regarding specimen preparation.
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.
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An American National Standard
Designation:D2307–07
Standard Test Method for
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Thermal Endurance of Film-Insulated Round Magnet Wire
This standard is issued under the fixed designation D 2307; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope* 2. Referenced Documents
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1.1 This test method covers determination of the thermal 2.1 ASTM Standards:
endurance of film-insulated round magnet wire in air at D 1676 Test Methods for Film-Insulated Magnet Wire
atmospheric pressure. It is not applicable to magnet wire with D 1711 Terminology Relating to Electrical Insulation
fibrous insulation, such as cotton or glass. D 3251 Test Method forThermal Endurance Characteristics
1.2 The values stated in inch-pound units are to be regarded of Electrical Insulating Varnishes Applied Over Film-
as the standard. The SI units in parentheses are provided for Insulated Magnet Wire
information only. D 5423 Specification for Forced-Convection Laboratory
1.3 This test method covers the evaluation of thermal Ovens for Evaluation of Electrical Insulation
endurance by observing changes in response to ac proof 2.2 Other Standards:
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voltage tests. The evaluation of thermal endurance by observ- IEC 60172 Statistical Analysis of Thermal Life Test Data
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ing changes in other properties of magnet wire insulation IEEE 101 Statistical Analysis of Thermal Life Test Data
requires the use of different test methods.
3. Terminology
1.4 It is possible that exposure of some types of film
3.1 Definitions:
insulated wire to heat in gaseous or liquid environments in the
absence of air will give thermal endurance values different 3.1.1 temperature index, n—a number which permits com-
parison of the temperature/time characteristics of an electrical
from those obtained in air. Consider this possibility when
interpreting the results obtained by heating in air with respect insulatingmaterial,orasimplecombinationofmaterials,based
on the temperature in degrees Celsius which is obtained by
to applications where the wire will not be exposed to air in
service. extrapolating theArrhenius plot of life versus temperature to a
specified time, usually 20 000 h.
1.5 It is possible that electric stress applied for extended
3.1.2 thermal endurance, n—an expression for the stability
periods at a level exceeding or even approaching the discharge
inception voltage will change significantly the thermal endur- of an electrical insulating material, or a simple combination of
materials, when maintained at elevated temperatures for ex-
ance of film insulated wires. Under such electric stress condi-
tions, it is possible that comparisons between materials will tended periods of time.
3.2 Definitions of Terms Specific to This Standard:
also differ from those developed using this method.
1.6 This test method is similar to IEC 60172. Differences 3.2.1 specimen failure time, n—the hours at the exposure
temperature that have resulted in a specimen failing the proof
exist regarding specimen preparation.
1.7 This standard does not purport to address all of the test (see 9.1).
3.2.2 thermal endurance cycle, n—one oven exposure pe-
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- riod followed by a proof voltage test.
3.2.3 time to failure, n—thelogaveragehourscalculatedfor
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. a set of specimens, calculated from the individual specimen
failure times at an exposure temperature (see 9.2).
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
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This test method is under the jurisdiction of ASTM Committee D09 on the ASTM website.
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Electrical and Electronic Insulating Materials and is the direct responsibility of Available from International Electrotechnical Commission (IEC), 3 rue de
Subcommittee D09.10 on Magnet Wire Insulation. Varembé, Case postale 131, CH-1211, Geneva 20, Switzerland.
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Current edition approved Jan. 1, 2007. Published February 2007. Originally Available from Institute of Electrical and Electronics Engineers, Inc. (IEEE),
approved in 1964. Last previous edition approved in 2005 as D 2307 – 05. 445 Hoes Ln., P.O. Box 1331, Piscataway, NJ 08854-1331.
*A Summary of Changes section appears at the end of this standard.
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