ASTM D2307-05
(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.
Note 1—Other solid conductors such as coated resistance wire may be evaluated by this test method.
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 Exposure of some types of film insulated wire to heat in gaseous or liquid environments in the absence of air may give thermal endurance values different from those obtained in air. This fact should be considered 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 Electric stress applied for extended periods at a level exceeding or even approaching the discharge inception voltage may change significantly the thermal endurance of film insulated wires, varnished or unvarnished. Under such electric stress conditions, comparisons between materials may also differ from those developed using this method.
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 consult and 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:D2307–05
Standard Test Method for
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Thermal Endurance of Film-Insulated Round Magnet Wire
This standard is issued under the fixed designation D2307; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber 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 D1676 Test Methods for Film-Insulated Magnet Wire
atmospheric pressure. It is not applicable to magnet wire with D1711 Terminology Relating to Electrical Insulation
fibrous insulation, such as cotton or glass. D3251 TestMethodforThermalEnduranceCharacteristics
1.2 The values stated in inch-pound units are to be regarded of Electrical Insulating VarnishesApplied over Film Insu-
as the standard. The SI units in parentheses are provided for lated Magnet Wire
information only. D5423 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 20000 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 IEC60172. 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).
3.3 For definitions of terms related to electrical insulation,
see Terminology D1711.
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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
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This test method is under the jurisdiction of ASTM Committee D09 on Standards volume information, refer to the standard’s Document Summary page on
Electrical and Electronic Insulating Materials and is the direct responsibility of the ASTM website.
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Subcommittee D09.10 on Magnet Wire Insulation. Available from International Electrotechnical Commission (IEC), 3 rue de
Current edition approved September 1, 2005. Published September 2005. Varembé, Case postale 131, CH-1211, Geneva 20, Switzerland.
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Originally approved in 1964. Last previous edition approved in 2001 as Available from Institute of Electrical and Electronics Engineers, Inc. (IEEE),
D2307–01. 445 Hoes Ln., P.O. Box 1331, Piscataway, NJ 08854-1331.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959
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