ASTM D4246-02

Standard Specification for Ozone-Resistant Thermoplastic Elastomer Insulation For Wire and Cable, 90&#176C Operation

ABSTRACT
This specification covers an ozone-resistant thermoplastic elastomer insulation for electrical wire and cables. This type of insulation is considered to be suitable for continuous operation at the specified conductor temperatures and operating voltages in dry locations. The minimum installation temperature is specified. Tests shall be done on insulated wire or cable solely to determine the relevant property of the insulation material and not to test the conductor or completed cable. The insulation shall conform to the prescribed physical property requirements such as (1) tensile strength and elongation at rupture before and after air oven aging test, (2) heat distortion, and (3) thickness. AC voltage, insulation resistance, and DC voltage tests shall be performed in that order when any of these tests are specified for electrical requirements. The insulation shall not show any cracks when tested by cold bend test and shall show no cracking or surface checking after exposure to the prescribed ozone concentration.
SCOPE
1.1 This specification covers an ozone-resistant insulating compound for electrical wire and cables 14 AWG and larger. This compound consists substantially of a thermoplastic elastomer.
1.2 This type of insulation is considered suitable for continuous operation at conductor temperatures not exceeding 90°C in dry locations. Operating voltages are not to exceed 2000 V. The minimum installation temperature is -40°C.
1.3 Whenever two sets of values are presented, in different units, the values in the first set are the standard, while those in parentheses are for information only.
1.4 In many instances the insulation material cannot be tested unless it has been formed around a conductor or cable. Therefore, tests are done on insulated wire or cable in this specification solely to determine the relevant property of the insulation material and not to test the conductor or completed cable.

General Information

• Status: Historical
• Publication Date: 09-Mar-2002
• ICS: 29.035.20 - Plastics and rubber insulating materials
• Technical Committee: D09 - Electrical and Electronic Insulating Materials

Relations

• Replaces: ASTM D4246-97 - Standard Specification for Ozone-Resistant Thermoplastic Elastomer Insulation For Wire and Cable, 90&#176C Operation
• Effective Date: 10-Mar-2002
• Replaced By: ASTM D4246-02(2010) - Standard Specification for Ozone-Resistant Thermoplastic Elastomer Insulation For Wire and Cable, 90&#176C Operation
• Effective Date: 01-Mar-2010
• Referred By: ASTM D4967-21 - Standard Guide for Selecting Materials to Be Used for Insulation, Jacketing, and Strength Components in Fiber-Optic Cables
• Effective Date: 10-Mar-2002

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
An American National Standard
Designation: D4246 – 02
Standard Specification for
Ozone-Resistant Thermoplastic Elastomer Insulation For
1
Wire and Cable, 90°C Operation
This standard is issued under the fixed designation D4246; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Physical Properties
1.1 This specification covers an ozone-resistant insulating 4.1 Requirements for physical properties are listed in Table
compound for electrical wire and cables 14 AWG and larger. 1.
This compound consists substantially of a thermoplastic elas- 4.2 Thickness of Insulation—Table number 1(a), (Conduc-
tomer. tor Sizes, Insulation Thicknesses, and AC Test Voltages for
1.2 This type of insulation is considered suitable for con- Rubber Insulations) of Test Methods D470 lists the minimum
tinuous operation at conductor temperatures not exceeding average thickness for the insulation. The required minimum
90°C in dry locations. Operating voltages are not to exceed thickness is 90% of the specified average thickness.
2000 V. The minimum installation temperature is−40°C.
5. Electrical Requirements Electrical Requirements
1.3 Whenever two sets of values are presented, in different
5.1 Order of Testing—Perform the ac voltage, insulation
units, the values in the first set are the standard, while those in
parentheses are for information only. resistance, and dc voltage tests in that order when any of these
tests are specified. The sequence of other testing is not
1.4 In many instances the insulation material cannot be
tested unless it has been formed around a conductor or cable. specified.
5.2 AC Voltage Test—Unless otherwise specified, omit this
Therefore, tests are done on insulated wire or cable in this
specification solely to determine the relevant property of the test if the dc voltage test described in 5.4 is to be performed.
insulation material and not to test the conductor or completed Test each insulated conductor for 5 min at the ac voltage given
in Table number 1(a) (Conductor Sizes, Insulation Thick-
cable.
nesses, and AC Test Voltages, for Rubber Insulations) of
2. Referenced Documents
Methods D470 under the columns labelled “Ozone-Resisting
2
2.1 ASTM Standards: Insulations.”
D470 Test Methods for Crosslinked Insulations and Jackets 5.3 Insulation Resistance—The insulated conductor shall
for Wire and Cable have an insulation resistance value of at least that correspond-
D1711 Terminology Relating to Electrical Insulation ing to a constant of 10 000 at 60°F (15.6°C).
D2633 Test Methods for Thermoplastic Insulations and 5.3.1 If the water temperature at the time measurement was
Jackets for Wire and Cable made differs from 60°F (15.6°C), correct the insulation resis-
tance to 60°F. Table number 2, (Temperature Correction
3. Terminology
Factors for Insulation Resistance at 60°F) of Test Methods
3.1 Definitions: For definitions of terms used in this speci-
D470 contains the correction factors. Each insulation manu-
fication refer to Terminology D1711. facturer can furnish the 1°F coefficient for the insulation
3.2 Definition of Term Specific to This Standard.
material by using the procedure given in Test Methods D470.
3.2.1 aging (act of), n—the exposure of materials to air at Multiply the measured value by the correction factor to obtain
121°C for 168 h.
the insulation resistance value corrected to 60°F.
5.3.2 If the insulated conductor is covered with a non-
1 metallic sheath so that the insulation resistance can be mea-
This specification is under the jurisdiction of ASTM Committee D09 on
sured only on the completed assembly, the required insulation
Electrical and Electronic Insulating Materials and is the direct responsibility of
Subcommittee D09.18 on Solid Insulations, Non-Metallic Shieldings, and Cover-
resistanceshallbeatleast60%ofthatrequiredfortheprimary
ings for Electrical and Telecommunications Wires and Cables.
insulation based on the thickness of that insulation.
Current edition approved March 10, 2002. Published June 2002. Originally
5.4 DC Voltage Test—Unless otherwise specified, omit this
published as D4246–83. Last previous edition D4246–97. DOI: 10.1520/D4246-
02. test if the ac voltage test described in 5.2 has been performed.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
After completion of the insulation resistance test, test each
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
insulated conductor for 5 min at the dc test voltage given in
Standards volume information, refer to the standard’s Document Summary page on
Tablenumber1(b)(ConductorSiz
...