ASTM D5374-22a

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 variations from absolute uniformity that have been accepted internationally for these ovens. These test methods include procedures for measuring these variations 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 60216-4-1, 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-Aug-2022
• 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)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D5374 − 22a
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 2.2 Other Document:
IEC Publication 60216-4-1 Guide for the Determination of
1.1 These test methods cover procedures for evaluating the
Thermal Endurance Properties of Electrical Insulating
characteristics of forced-convection ventilated electrically-
Materials, Part 4—Aging Ovens, Section 1—Single-
heated ovens, operating over all or part of the temperature
4
Chamber Ovens
rangefrom20 °Cabovetheambienttemperatureto500 °Cand
used for thermal endurance evaluation of electrical insulating
3. Terminology
materials.
3.1 Refer to the terminology section of Specification
1.2 ThesetestmethodsarebasedonIECPublication60216-
D5423. For other terms related to electrical and electronic
4-1, and are technically identical to it. This compilation of test
insulating materials issues, refer to Terminology D1711.
methods and an associated specification, D5423, have replaced
Specification D2436.
4. Significance and Use
1.3 This standard does not purport to address all of the
4.1 Ovens used for thermal evaluation of insulating materi-
safety concerns, if any, associated with its use. It is the
als are to be capable of maintaining uniform conditions of
responsibility of the user of this standard to establish appro-
temperature and air circulation over the extended periods of
priate safety, health, and environmental practices and deter-
time that are required for conducting these tests. Specification
mine the applicability of regulatory limitations prior to use.
D5423 specifies the permissible variations from absolute
1.4 This international standard was developed in accor-
uniformity that have been accepted internationally for these
dance with internationally recognized principles on standard-
ovens. These test methods include procedures for measuring
ization established in the Decision on Principles for the
thesevariationsandotherspecifiedcharacteristicsoftheovens.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
5. Apparatus
Barriers to Trade (TBT) Committee.
5.1 Multi-PointRecordingPotentiometer, having provisions
for at least nine iron-constantan or chromel-alumel
2. Referenced Documents
thermocouples, with scale readings to 0.1 °C or less. Use of a
2
2.1 ASTM Standards:
data processor or a data logger is helpful in reducing the
D1711 Terminology Relating to Electrical Insulation
number of calculations required.
D2436 Specification for Forced-Convection Laboratory Ov-
3
5.2 Calibrated Iron-Constantan or Chromel-Alumel
ens for Electrical Insulation (Withdrawn 1994)
Thermocouples, using 0.5 mm diameter or smaller wire and
D5423 Specification for Forced-Convection Laboratory Ov-
having a junction size not over 2.5 mm long.
ens for Evaluation of Electrical Insulation
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
1
These test methods are under the jurisdiction of ASTM Committee D09 on
other by more than 0.2 °C when placed within 10 mm of each
Electrical and Electronic Insulating Materials and are the direct responsibility of
Subcommittee D09.17 on Fire and Thermal Properties.
other without touching inside an oven chamber at 200 °C.
Current edition approved Sept. 1, 2022. Published October 2022. Originally
5.3 It is acceptable to use a temperature measuring system
approved in 1993. Last previous edition approved in 2022 as D5374 – 22. DOI:
10.1520/D5374-22A.
other than thermocouples and a potentiometer, provided that
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
the sensitivity, accuracy, and response time are equivalent to
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 4
The last approved version of this historical standard is referenced on Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
www.astm.org. 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. Unite
...

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 − 22 D5374 − 22a
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 60216-4-1, 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D1711 Terminology Relating to Electrical Insulation
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 60216-4-1 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. For other terms related to electrical and electronic insulating
materials issues, refer to Terminology D1711.
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 Fire and Thermal Properties.
Current edition approved Jan. 1, 2022Sept. 1, 2022. Published February 2022October 2022. Originally approved in 1993. Last previous edition approved in 20132022 as
D5374 – 13.D5374 – 22. DOI: 10.1520/D5374-22.10.1520/D5374-22A.
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, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D5374 − 22a
4. 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 variations from absolute uniformity that have been accepted internationally for these ovens. These test methods include
procedures for measuring these variations 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 is helpful in reducing the number of calculations
required.
5.2 Calibrated Iron-Constantan or Chromel-Alumel Thermocouples, using 0.5-mm0.5 mm diameter or smaller wire and having
a junction size not over 2.5 mm long.
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 mor
...