ASTM D5374-13

Standard Test Methods for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation

SIGNIFICANCE AND USE
4.1 Ovens used for thermal evaluation of insulating materials are to be capable of maintaining uniform conditions of temperature and air circulation over the extended periods of time that are required for conducting these tests. Specification D5423 specifies the permissible deviations from absolute uniformity that have been generally accepted internationally for these ovens. These test methods include procedures for measuring these deviations and other specified characteristics of the ovens.
SCOPE
1.1 These test methods cover procedures for evaluating the characteristics of forced-convection ventilated electrically-heated ovens, operating over all or part of the temperature range from 20°C above the ambient temperature to 500°C and used for thermal endurance evaluation of electrical insulating materials.  
1.2 These test methods are based on IEC Publication 216-4-1, and are technically identical to it. This compilation of test methods and an associated specification, D5423, have replaced Specification D2436.  
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: 31-Aug-2013
• ICS: 29.035.01 - Insulating materials in general
• Technical Committee: D09 - Electrical and Electronic Insulating Materials
• Drafting Committee: D09.17 - Fire and Thermal Properties

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D5374 − 13
Standard Test Methods for
Forced-Convection Laboratory Ovens for Evaluation of
1
Electrical Insulation
This standard is issued under the fixed designation D5374; 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 3. Terminology
1.1 These test methods cover procedures for evaluating the 3.1 Refer to the terminology section of Specification
characteristics of forced-convection ventilated electrically- D5423.
heated ovens, operating over all or part of the temperature
4. Significance and Use
range from 20°C above the ambient temperature to 500°C and
used for thermal endurance evaluation of electrical insulating
4.1 Ovens used for thermal evaluation of insulating materi-
materials.
als are to be capable of maintaining uniform conditions of
temperature and air circulation over the extended periods of
1.2 These test methods are based on IEC Publication 216-
time that are required for conducting these tests. Specification
4-1, and are technically identical to it. This compilation of test
D5423 specifies the permissible deviations from absolute
methods and an associated specification, D5423, have replaced
uniformity that have been generally accepted internationally
Specification D2436.
for these ovens. These test methods include procedures for
1.3 This standard does not purport to address all of the
measuring these deviations and other specified characteristics
safety concerns, if any, associated with its use. It is the
of the ovens.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Apparatus
bility of regulatory limitations prior to use.
5.1 Multi-PointRecordingPotentiometer, having provisions
for at least nine iron-constantan or chromel-alumel
2. Referenced Documents
2 thermocouples, with scale readings to 0.1°C or less. Use of a
2.1 ASTM Standards:
data processor or a data logger is helpful in reducing the
D2436 Specification for Forced-Convection Laboratory Ov-
3 number of calculations required.
ens for Electrical Insulation (Withdrawn 1994)
5.2 Calibrated Iron-Constantan or Chromel-Alumel
D5423 Specification for Forced-Convection Laboratory Ov-
ens for Evaluation of Electrical Insulation Thermocouples, using 0.5-mm diameter or smaller wire and
having a junction size not over 2.5 mm long.
2.2 Other Document:
5.2.1 If calibrated thermocouples are not available, use
IEC Publication 216-4-1 Guide for the Determination of
thermocouples made from a single spool of thermocouple wire
Thermal Endurance Properties of Electrical Insulating
that gives values for temperature that do not differ from each
Materials, Part 4—Aging Ovens, Section 1—Single-
4
other by more than 0.2°C when placed within 10 mm of each
Chamber Ovens
other without touching inside an oven chamber at 200°C.
5.3 It is acceptable to use a temperature measuring system
1 other than thermocouples and a potentiometer, provided that
These test methods are under the jurisdiction of ASTM Committee D09 on
Electrical and Electronic Insulating Materials and are the direct responsibility of
the sensitivity, accuracy, and response time are equivalent to
Subcommittee D09.17 on Thermal Characteristics.
that of the equipment described above, and that the objectives
Current edition approved Sept. 1, 2013. Published September 2013. Originally
of 6.2.3 relative to minimization of heat conduction effects are
approved in 1993. Last previous edition approved in 2005 as D5374 – 93 (2005).
met.
DOI: 10.1520/D5374-13.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.4 Thermal Lag Time Specimen, consisting of a solid brass
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
cylinder, 10 mm in diameter and 55 mm long, with one
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
junction of a differential thermocouple soldered to the surface
3
The last approved version of this historical standard is referenced on
midway between the ends. The other junction of the thermo-
www.astm.org.
4
couple must be capable of being moved at least 80 mm away
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
4th Floor, New York, NY 10036. from the brass cylinder. An appropriate temperature indicator
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D5374 − 13
(as in 5.1, or other) must be provided for indication of
∆T = difference in temperature
...

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.
Designation: D5374 − 93 (Reapproved 2005) D5374 − 13 An American National Standard
Standard Test Methods for
Forced-Convection Laboratory Ovens for Evaluation of
1
Electrical Insulation
This standard is issued under the fixed designation D5374; 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 procedures for evaluating the characteristics of forced-convection ventilated electrically-heated
ovens, operating over all or part of the temperature range from 20°C above the ambient temperature to 500°C and used for thermal
endurance evaluation of electrical insulating materials.
1.2 These test methods are based on IEC Publication 216-4-1, and are technically identical to it. This compilation of test
methods and an associated specification, D5423, have replaced Specification D2436.
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.
2. Referenced Documents
2
2.1 ASTM Standards:
3
D2436 Specification for Forced-Convection Laboratory Ovens for Electrical Insulation (Withdrawn 1994)
D5423 Specification for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation
2.2 Other Document:
IEC Publication 216-4-1 Guide for the Determination of Thermal Endurance Properties of Electrical Insulating Materials, Part
4
4—Aging Ovens, Section 1—Single-Chamber Ovens
3. Terminology
3.1 Refer to the terminology section of Specification D5423.
4. Significance and Use
4.1 It is essential that ovens Ovens used for thermal evaluation of insulating materials are to be capable of maintaining uniform
conditions of temperature and air circulation over the extended periods of time that are required for conducting these tests.
Specification D5423 specifies the permissible deviations from absolute uniformity that have been generally accepted internation-
ally for these ovens. These test methods include procedures for measuring these deviations and other specified characteristics of
the ovens.
5. Apparatus
5.1 Multi-Point Recording Potentiometer, having provisions for at least nine iron-constantan or chromel-alumel thermocouples,
with scale readings to 0.1°C or less. Use of a data processor or a data logger may be is helpful in reducing the number of
calculations required.
1
These test methods are under the jurisdiction of ASTM Committee D09 on Electrical and Electronic Insulating Materials and are the direct responsibility of Subcommittee
D09.17 on Thermal Characteristics.
Current edition approved Sept. 1, 2005Sept. 1, 2013. Published October 2005September 2013. Originally approved in 1993. Last previous edition approved in 19992005
as D5374 – 93 (2005). (1999). DOI: 10.1520/D5374-93R05.10.1520/D5374-13.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
The last approved version of this historical standard is referenced on www.astm.org.
4
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D5374 − 13
5.2 Calibrated Iron-Constantan or Chromel-Alumel Thermocouples, using 0.5-mm diameter or smaller wire and having a
junction size not over 2.5 mm long. If calibrated thermocouples are not available, thermocouples made from a single spool of
thermocouple wire may be used provided that, when placed within 10 mm of each other without touching in an oven chamber at
200°C, they give values for temperature that do not differ from each other by more than 0.2°C.
5.2.1 If calibrated thermocouples are not available, use thermocouples made from a single spool of thermocouple wire that
gives values for temperature that do not differ from each other by more than 0.2°C when placed within 10 mm of each other without
touching inside an oven chamber at 200°C.
5.3 A It is acceptable to use
...