ASTM D2655-12
(Specification)Standard Specification for Crosslinked Polyethylene Insulation for Wire and Cable Rated 0 to 2000 V
Standard Specification for Crosslinked Polyethylene Insulation for Wire and Cable Rated 0 to 2000 V
ABSTRACT
This specification covers crosslinked polymer insulation material consisting substantially of polyethylene or a polyethylene copolymer for electrical wires and cables in conductor, suitable for continuous use on power cables in wet and dry locations, having specified sizes and operating at specified voltage ratings and conductor temperatures. Materials covered by this specification are not sunlight and weather resistant unless they are carbon black pigmented or contain an additive system designed for this protection. Since the insulation cannot be tested unless it has been formed around a conductor, tests shall then be done on insulated wire solely to determine the relevant property of the insulation and not to test the conductor or completed cable. Materials shall meet the physical properties as follows: unaged tensile strength and elongation at rupture; tensile strength and elongation at rupture after air oven aging; heat distortion; filled and unfilled percent hot creep; and filled and unfilled percent hot set. Insulations shall also perform satisfactorily during tests for AC and DC voltage, insulation resistance, and accelerated water absorption.
SCOPE
1.1 This specification covers a crosslinked polyethylene insulation for electrical wires and cables in conductor sizes 14 AWG [2.08 mm2] and larger. The base polymer of this insulation consists substantially of polyethylene or a polyethylene copolymer.
1.2 This type of insulation is suitable for continuous use on power cables in wet and dry locations, for voltage ratings not exceeding 2000 V and at conductor temperatures not exceeding 90°C for normal operation. For copper conductors, the insulation can be applied over the uncoated metal.
1.3 Materials covered by this specification are not sunlight and weather resistant unless they are carbon black pigmented or contain an additive system designed for this protection.
1.4 In many instances the insulation cannot be tested unless it has been formed around a conductor. Therefore, tests are done on insulated wire in this standard solely to determine the relevant property of the insulation and not to test the conductor or completed cable.
1.5 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.
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Designation:D2655 −12
Standard Specification for
Crosslinked Polyethylene Insulation for Wire and Cable
1
Rated 0 to 2000 V
This standard is issued under the fixed designation D2655; 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 Swell Ratio of Crosslinked Ethylene Plastics
2.2 ICEA Standard:
1.1 This specification covers a crosslinked polyethylene
ICEAT-28-562 Test Method for Measurement of Hot Creep
insulation for electrical wires and cables in conductor sizes 14
3
2
of Polymeric Insulations
AWG [2.08 mm ] and larger. The base polymer of this
insulation consists substantially of polyethylene or a polyeth-
3. Terminology
ylene copolymer.
3.1 Definitions:
1.2 This type of insulation is suitable for continuous use on
3.1.1 For definitions of terms used in this specification refer
power cables in wet and dry locations, for voltage ratings not
to Terminology D1711.
exceeding2000Vandatconductortemperaturesnotexceeding
90°C for normal operation. For copper conductors, the insula-
3.2 Definitions of Terms Specific to This Standard:
tion can be applied over the uncoated metal.
3.2.1 aging (act of), n—exposure of materials to air at
121°C for 168 h.
1.3 Materials covered by this specification are not sunlight
and weather resistant unless they are carbon black pigmented
4. Physical Properties
or contain an additive system designed for this protection.
4.1 The requirements for the insulation are listed in Table 1.
1.4 In many instances the insulation cannot be tested unless
it has been formed around a conductor. Therefore, tests are
5. Electrical Requirements
done on insulated wire in this standard solely to determine the
relevant property of the insulation and not to test the conductor
5.1 Order of Testing—Perform the ac voltage, insulation
or completed cable.
resistance, and dc voltage tests in that order when any of these
tests are required. The sequence for other testing is not
1.5 Whenever two sets of values are presented, in different
specified.
units, the values in the first set are the standard, while those in
parentheses are for information only.
5.2 AC Voltage Test—Subject wires and cables to an ac test
voltage for a period of 5 min. Unless otherwise specified, omit
2. Referenced Documents
this test if the dc voltage test described in 5.4 is to be
2
performed. Test at a voltage of 100 V/mil [4 kV/mm] based on
2.1 ASTM Standards:
the specified nominal thickness of insulation for the rated
D470 Test Methods for Crosslinked Insulations and Jackets
circuit voltage, phase to phase. Conduct the tests in accordance
for Wire and Cable
with Test Methods D470.
D1248 Specification for Polyethylene Plastics Extrusion
Materials for Wire and Cable
5.3 Insulation Resistance—The insulated conductor shall
D1711 Terminology Relating to Electrical Insulation
have an insulation resistance equal to or greater than that
D2765 Test Methods for Determination of Gel Content and
corresponding to a constant of 10 000 at 60°F [15.6°C]. When
the temperature of the water in which the insulation is tested
differs from 60°F, apply a correction factor. Table 2 of Test
1
This specification is under the jurisdiction of ASTM Committee D09 on
Methods D470 contains the correction factors. Each insulation
Electrical and Electronic Insulating Materials and is the direct responsibility of
manufacturer can furnish the 1°F coefficient for the insulation
Subcommittee D09.07 on Electrical Insulating Materials.
Current edition approved Jan. 1, 2012. Published February 2012. Originally material by using the procedure given in Test Methods D470.
approved in 1967. Last previous edition approved in 2006 as D2655 – 00 (2006).
DOI: 10.1520/D2655-12.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from Insulated Cable Engineers Association, P. O. Box 440, South
Standards volume information, refer to the standard’s Document Summary page on Yarmouth, MA 02664 or Global Engineering Documents, 15 Inverness Way East,
the ASTM website. Englewood, CO 80112.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D2655−12
TABLE 1 Physical Properties for Crosslinked Polyethylene
accordancewiththeAcceleratedWaterAbsorptionTestsinTest
Insulation
Methods D470. Conduct the Electrical Method Test at 60 Hz
Unaged Requirements:
with the water temperature at 75 6 1°C.
Tensile strength, min, psi [MPa] 1800 [12.4]
Elongation at rupture, min, %
...
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:D2655–00 (Reapproved 2006) Designation: D2655 – 12
Standard Specification for
Crosslinked Polyethylene Insulation for Wire and Cable
1
Rated 0 to 2000 V
This standard is issued under the fixed designation D2655; 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 This specification covers a crosslinked polyethylene insulation for electrical wires and cables in conductor sizes 14 AWG
2
[2.08 mm ] and larger. The base polymer of this insulation consists substantially of polyethylene or a polyethylene copolymer.
1.2 This type of insulation is suitable for continuous use on power cables in wet and dry locations, for voltage ratings not
exceeding 2000 V and at conductor temperatures not exceeding 90°C for normal operation. For copper conductors, the insulation
maycan be applied over the uncoated metal.
1.3 Materials covered by this specification are not sunlight and weather resistant unless they are carbon black pigmented or
contain an additive system designed for this protection.
1.4 In many instances the insulation cannot be tested unless it has been formed around a conductor. Therefore, tests are done
on insulated wire in this standard solely to determine the relevant property of the insulation and not to test the conductor or
completed cable.
1.5 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D470 Test Methods for Crosslinked Insulations and Jackets for Wire and Cable
D1248 Specification for Polyethylene Plastics Extrusion Materials for Wire and Cable
D1711 Terminology Relating to Electrical Insulation
D2765 Test Methods for Determination of Gel Content and Swell Ratio of Crosslinked Ethylene Plastics
2.2 ICEA Standard:
3
ICEA T-28-562 Test Method for Measurement of Hot Creep of Polymeric Insulations
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this specification refer to Terminology D1711.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 aging (act of), n—exposure of materials to air at 121°C for 168 h.
4. Physical Properties
4.1 The requirements for the insulation are listed in Table 1.
5. Electrical Requirements
5.1 Order of Testing—Perform the ac voltage, insulation resistance, and dc voltage tests in that order when any of these tests
are required. The sequence for other testing is not specified.
5.2 AC Voltage Test—Subject wires and cables to an ac test voltage for a period of 5 min. Unless otherwise specified, omit this
test if the dc voltage test described in 5.4 is to be performed. Test at a voltage of 100 V/mil [4 kV/mm] based on the specified
1
This specification is under the jurisdiction of ASTM Committee D09 on Electrical and Electronic Insulating Materials and is the direct responsibility of Subcommittee
D09.18 on Solid Insulations, Non-Metallic Shieldings, and Coverings for Electrical and Telecommunications Wires and Cables.
Current edition approved AprilJan. 1, 2006.2012. Published April 2006.February 2012. Originally approved in 1967. Last previous edition approved in 20002006 as
D2655 – 00(2006). DOI: 10.1520/D2655-00R06.10.1520/D2655-12.
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 Insulated Cable Engineers Association, P. O. Box 440, South Yarmouth, MA 02664 or Global Engineering Documents, 15 Inverness Way East,
Englewood, CO 80112.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D2655 – 12
TABLE 1 Physical Properties for Crosslinked Polyethylene
Insulation
Unaged Requirements:
Tensile strength, min, psi [MPa] 1800 [12.4]
Elongation at rupture, min, % 250
Aged Requirements:
After Air Oven Test at 121 6 1 °C for 168 h:
Tensile strength, min, % of unaged value 75
Elongation at rupture, min, % of unaged value 75
Heat Distortion:
At 121 6 1 °C, max, % of unaged value:
2
4/0 Awg [107 mm ] and smaller (insulation on cable) 30
2
Larger than 4/0 A
...
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