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ASTM A717/A717M-01

(Test Method)

Standard Test Method for Surface Insulation Resistivity of Single-Strip Specimens

Standard Test Method for Surface Insulation Resistivity of Single-Strip Specimens

SCOPE
1.1 This test method covers a means of testing the surface insulation resistivity of single strips or punchings of flat-rolled electrical steel under predetermined conditions of voltage, pressure, and temperature.
1.2 The values stated in either customary units (cgs-emu and inch-pound) or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
1.3  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.

General Information

Status
Historical
Publication Date
09-May-2001
ICS
29.035.20 - Plastics and rubber insulating materials
Technical Committee
A06 - Magnetic Properties
Drafting Committee
A06.01 - Test Methods
Current Stage
Ref Project

Relations

Replaces
ASTM A717/A717M-95 - Standard Test Method for Surface Insulation Resistivity of Single-Strip Specimens
Effective Date
10-May-2001
Replaced By
ASTM A717/A717M-06 - Standard Test Method for Surface Insulation Resistivity of Single-Strip Specimens
Effective Date
01-May-2006
Referred By
ASTM A677-16 - Standard Specification for Nonoriented Electrical Steel Fully Processed Types
Effective Date
10-May-2001
Referred By
ASTM A937/A937M-12(2019) - Standard Test Method for Determining Interlaminar Resistance of Insulating Coatings Using Two Adjacent Test Surfaces
Effective Date
10-May-2001
Referred By
ASTM A345-19 - Standard Specification for Flat-Rolled Electrical Steels for Magnetic Applications
Effective Date
10-May-2001
Referred By
ASTM A726-18 - Standard Specification for Cold-Rolled Magnetic Lamination Quality Steel, Semiprocessed Types
Effective Date
10-May-2001
Referred By
ASTM A876-17e1 - Standard Specification for Flat-Rolled, Grain-Oriented, Silicon-Iron, Electrical Steel, Fully Processed Types
Effective Date
10-May-2001
Referred By
ASTM A976-18 - Standard Classification of Insulating Coatings for Electrical Steels by Composition, Relative Insulating Ability and Application
Effective Date
10-May-2001
Referred By
ASTM A1086-20 - Standard Specification for Thin-Gauge Nonoriented Electrical Steel Fully Processed Types
Effective Date
10-May-2001

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ASTM A717/A717M-01 - Standard Test Method for Surface Insulation Resistivity of Single-Strip SpecimensASTM A717/A717M-01 - Standard Test Method for Surface Insulation Resistivity of Single-Strip Specimens
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ASTM A717/A717M-01 - Standard Test Method for Surface Insulation Resistivity of Single-Strip Specimens
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: A 717/A 717M – 01
Standard Test Method for
1
Surface Insulation Resistivity of Single-Strip Specimens
This standard is issued under the fixed designationA717/A717M; 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 the base metal by two drills. The effectiveness of the surface
insulation is then indicated by a measurement of average
1.1 This test method covers a means of testing the surface
electrical current flowing between the contacts and the base
insulation resistivity of single strips or punchings of flat-rolled
metal under specified applied voltage. This measurement can
electrical steel under predetermined conditions of voltage,
be used directly as an indicator of insulation quality or may be
pressure, and temperature.
converted to an apparent surface insulation resistivity value.
1.2 The values and equations stated in customary (cgs-emu
and inch-pound) or SI units are to be regarded separately as
5. Significance and Use
standard. Within this standard, SI units are shown in brackets.
5.1 This test method is particularly suitable for quality
The values stated in each system may not be exact equivalents;
control in the application of insulating coatings.
therefore, each system shall be used independently of the other.
5.2 Surface insulation resistivity is evaluated from a dc
Combining values from the two systems may result in noncon-
current that can range from 0 (perfect insulator) to 1A(perfect
formance with this standard.
conductor).
1.3 This standard does not purport to address all of the
5.3 Single readings should not be considered significant
safety concerns, if any, associated with its use. It is the
since the nature of the test device and specimen are such that
responsibility of the user of this standard to establish appro-
successive measurements of a specimen often yield different
priate safety and health practices and determine the applica-
values.
bility of regulatory limitations prior to use.
6. Apparatus
2. Referenced Documents
6.1 The apparatus, as shown in Fig. 1 and Fig. 2, shall
2.1 ASTM Standards:
consist of a contact unit or test head which is attached to the
A 34 Practice for Sampling and Procurement Testing of
2 head of a hydraulic press. Its associated measuring equipment,
Magnetic Materials
which may be remotely located, includes an ammeter, voltme-
3. Terminology ter, and voltage regulated dc power supply. When measure-
ments are to be made at elevated temperatures, the platen
3.1 Definitions of Terms Specific to This Standard:
beneath the specimen is heated and controlled. Detailed de-
3.1.1 The term surface insulation resistivity used in this
scriptions of the various components are given in Annex A1.
method refers to the effective resistivity of a single insulative
layer tested between applied bare metal contacts and the base
7. Sampling
metal of the insulated test specimen. It is not the same as the
7.1 Samples shall be representative of the steel and shall be
terms interlaminar resistivity and stack resistivity, which refer
cut in a manner to assure representative sampling as described
to the average resistivity of two adjacent insulative surfaces in
in Practice A 34.
contact with each other.
3.2 The apparatus is popularly known as a Franklin tester.
8. Test Specimen
8.1 The width and length of a specimen strip shall be greater
4. Summary of Test Method
than the width and length respectively of the assembly of
4.1 Ten metallic contacts of fixed area are applied to one of
contacts. The suggested minimum specimen size is 2 by 5 in.
thesurfacesofthespecimenandelectricalcontactismadewith
[50 by 130 mm].
8.2 A minimum of five specimen strips is recommended.
1
This test method is under the jurisdiction of ASTM Committee A06 on
Magnetic Properties, and is the direct responsibility of Subcommittee A06.01 on
Test Methods.
Current edition approved May 10, 2001. Published August 2001. Originally
published as A 717 – 75. Last previous edition A 717 – 93.
2
Annual Book of ASTM Standards, Vol 03.04.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
A 717/A 717M
FIG. 1 Apparatus of Surface Insulation Resistivity Measurement
9.6 When the insulation may be hygroscopic, a conditioning
procedure immediately prior to testing should be mutually
agreed upon by manufacturer and purchaser.
9.7 Place the specimen on the platen beneath the test head
and position it so that all contacts are within the test area when
the test head is brought in contact with
...

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1.1 This test method covers a means of testing the surface insulation resistivity of single strips or punchings of flat-rolled electrical steel under predetermined conditions of voltage, pressure, and temperature.  
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X1.3 Significance and Use
X1.3.1 Tests made on a cellular plastic under conditions herein prescribed can be of considerable value in comparing the rate of burning and/or extent and time of burning of different materials, in controlling manufacturing processes, or as a measure of deterioration or change in burning characteristics prior to or during use.
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SCOPE
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