ASTM D3353-10
(Test Method)Standard Test Methods for Fibrous-Insulated Magnet Wire
Standard Test Methods for Fibrous-Insulated Magnet Wire
ABSTRACT
These test methods cover the testing of fibrous-insulated electrical conductors, commonly referred to as magnet wire, which are used in electrical apparatus. The test methods are intended primarily for evaluation of the electrical insulating materials used. It is intended that these test methods be used, except where modified by individual specifications for particular applications. This elongation testing method covers the determination of the elongation of fibrous insulated magnet wire that results in a fracture of the conductor. The electrical resistance testing method covers the determination of the electrical resistance of fibrous insulated magnet wire conductors. The fibrous coverage testing method covers the determination of the quality of fibrous servings on round magnet wire or bare conductor. The measurement of dimensions test methods determine the dimensions of the bare or film insulated conductor and the fibrous-insulated magnet wire. The adhesion and flexibility test method covers the evaluation of the flexibility and adherence of varnished fibrous glass, and varnished or unvarnished fibrous polyester-glass insulating material on either bare conductor, or film-insulated magnet wire. The dielectric breakdown voltage test method covers the determination of the dielectric breakdown voltage in air of insulation on round, rectangular, and square wires at commercial power frequencies.
SCOPE
1.1 These test methods cover the testing of fibrous-insulated electrical conductors, commonly referred to as magnet wire, which are used in electrical apparatus. The test methods are intended primarily for evaluation of the electrical insulating materials used. It is intended that these test methods be used, except where modified by individual specifications for particular applications.
1.1.1 These test methods apply to those magnet wires that are fiber-covered and in which the substrate is bare conductor or is coated with an underlying insulating film as covered by Test Methods D1676. Fiber-covered wires are produced by serving helically or wrapping fibers or fibrous-tape insulation uniformly around the wire in single and multiple layers. The served or wrapped materials are bonded or not bonded to the underlying wire.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
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Designation: D3353 − 10
Standard Test Methods for
1
Fibrous-Insulated Magnet Wire
This standard is issued under the fixed designation D3353; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope* bility of regulatory limitations prior to use.See 8.4.1 and 9.4.1
for specific caution statements.
1.1 These test methods cover the testing of fibrous-insulated
electrical conductors, commonly referred to as magnet wire,
2. Referenced Documents
which are used in electrical apparatus. The test methods are
2
2.1 ASTM Standards:
intended primarily for evaluation of the electrical insulating
B193 Test Method for Resistivity of Electrical Conductor
materials used. It is intended that these test methods be used,
Materials
except where modified by individual specifications for particu-
D149 Test Method for Dielectric Breakdown Voltage and
lar applications.
DielectricStrengthofSolidElectricalInsulatingMaterials
1.1.1 These test methods apply to those magnet wires that
at Commercial Power Frequencies
are fiber-covered and in which the substrate is bare conductor
D1676 Test Methods for Film-Insulated Magnet Wire
or is coated with an underlying insulating film as covered by
D1711 Terminology Relating to Electrical Insulation
Test Methods D1676. Fiber-covered wires are produced by
D5423 Specification for Forced-Convection Laboratory Ov-
serving helically or wrapping fibers or fibrous-tape insulation
ens for Evaluation of Electrical Insulation
uniformly around the wire in single and multiple layers. The
E8 Test Methods for Tension Testing of Metallic Materials
served or wrapped materials are bonded or not bonded to the
2.2 Other Standards:
underlying wire.
3
IEC 60851 Methods of Test for Winding Wires
1.2 The test methods appear in the following sections:
NEMA Standards Publication No. MW 1000 on Magnet
4
Wire
Procedure Section
Measurement of Dimensions 7
Electrical Resistance of Conductors 5
3. Terminology
Elongation 4
Adhesion and Flexibility 8
3.1 Definitions:
Fibrous Coverage 6
3.1.1 For definitions of terms used in this test method, refer
Dielectric Breakdown Voltage 9
to Terminology D1711.
1.3 This standard and IEC 60851 are similar if not equiva-
3.1.2 Definition of Term(s) Specific to this Standard:
lent in technical content.
3.1.2.1 serving—a uniform wrapping of fibrous insulation
1.4 This standard and NEMA MW 1000 are similar if not around a magnet wire of bare conductor.
equivalent in technical content.
3.1.2.2 fibrous coverage, of served-magnet wire—that char-
acteristic which allows a fibrous served magnet wire to be
1.5 The values stated in inch-pound units are to be regarded
wound around mandrels in a prescribed manner without
as standard. The values given in parentheses are mathematical
causing observable openings in the fibrous coverage.
conversions to SI units that are provided for information only
and are not considered standard.
4. Elongation
1.6 This standard does not purport to address all of the
4.1 Scope—Thistestmethodcoversthedeterminationofthe
safety concerns, if any, associated with its use. It is the
elongation of fibrous insulated magnet wire that results in a
responsibility of the user of this standard to establish appro-
fracture of the conductor.
priate safety and health practices and determine the applica-
2
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
1
These test methods are 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 are the direct responsibility of the ASTM website.
3
Subcommittee D09.12 on Electrical Tests. Available from International Engineering Consortium, 549 West Randolph
Current edition approved Jan. 1, 2010. Published February 2010. Originally Street, Suite 600, Chicago IL 60661–2208.
4
approved in 1974. Last previous edition approved in 2004 as D3353–04. DOI: Available from National Electrical Manufacturers Association (NEMA), 1300
10.1520/D3353-10. N. 17th St., Suite 1752, Rosslyn, VA 22209, http://www.nema.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D3353 − 10
4.2 Significance and Use—The elongation determined by 4.6.7 Type of varnish,
this test method provides a general measure of the ductility of
4.6.8 Whether or not bench marks are used, and
the conducto
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
An American National Standard
Designation:D3353–04 Designation:D3353–10
Standard Test Methods for
1
Fibrous-Insulated Magnet Wire
This standard is issued under the fixed designation D3353; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 These test methods cover the testing of fibrous-insulated electrical conductors, commonly referred to as magnet wire, which
are used in electrical apparatus. The test methods are intended primarily for evaluation of the electrical insulating materials used.
It is intended that these test methods be used, except where modified by individual specifications for particular applications.
1.1.1 These test methods apply to those magnet wires that are fiber-covered and in which the substrate is bare conductor or is
coated with an underlying insulating film as covered by Test Methods D1676. Fiber-covered wires are produced by serving
helically or wrapping fibers or fibrous-tape insulation uniformly around the wire in single and multiple layers. The served or
wrapped materials are bonded or not bonded to the underlying wire.
1.2The values stated in inch-pound units are the standard. The SI equivalents of inch-pound units are provided for reference.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.3 The test methods appear in the following sections:
Procedure Section
Measurement of Dimensions 7
Electrical Resistance of Conductors 5
Elongation 4
Adhesion and Flexibility 8
Fibrous Coverage 6
Dielectric Breakdown Voltage 9
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.See 8.4.1 and 9.4.1 for specific caution statements.
1.5 This standard and IEC 60851 are similar if not equivalent in technical content.
1.6 This standard and NEMA,NEMA MW 1000 are similar if not equivalent in technical content.
2. Referenced Documents
2
2.1 ASTM Standards:
B193 Test Method for Resistivity of Electrical Conductor Materials
D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at
Commercial Power Frequencies
D1676 Test Methods for Film-Insulated Magnet Wire
D1711 Terminology Relating to Electrical Insulation
D5423 Specification for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation
E8 Test Methods for Tension Testing of Metallic Materials
2.2 Other Standards:
3
IEC 60851 Methods of Test for Winding Wires
4
NEMA Standards Publication No. MW 1000 on Magnet Wire
1
ThesetestmethodsareunderthejurisdictionofASTMCommitteeD09onElectricalandElectronicInsulatingMaterialsandarethedirectresponsibilityofSubcommittee
D09.10 on Magnet Wire Insulation.
Current edition approved AprilJan. 1, 2004.2010. Published May 2004.February 2010. Originally approved in 1974. Last previous edition approved in 19982004 as
D3353–98.D3353–04. DOI: 10.1520/D3353-104.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from International Engineering Consortium, 549 West Randolph Street, Suite 600, Chicago IL 60661–2208.
4
Available from National Electrical Manufacturers Association (NEMA), 1300 N. 17th St., Suite 1847,1752, Rosslyn, VA 22209, http://www.nema.org.
*ASummary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D3353–10
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this test method, refer to Terminology D1711.
3.1.2 Definition of Term(s) Specific to this Standard:
3.1.2.1 serving—a uniform wrapping of fibrous insulation around a magnet wire of bare conductor.
3.1.2.2 fibrous coverage, of served-magnet wire—that characteristic which allows a fibrous served magnet
...
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