ASTM D2656-06

Standard Specification for Crosslinked Polyethylene Insulation for Wire and Cable Rated 2001 to 35 000 V

ABSTRACT
This specification covers a crosslinked polyethylene insulation for electrical wires and cables for conductor sizes 8 AWG (8.37 mm2) and larger. The base polymer of this insulation consists substantially of polyethylene. The partial discharge, ac voltage, insulation resistance, and dc voltage shall be tested to meet the requirements prescribed. The accelerated water absorption, permittivity and dissipation factor, U-bend discharge, and surface resistivity shall be tested to meet the requirements prescribed. The heat distortion, and percent hot creep and percent hot set shall be tested to meet the requirements prescribed.
SCOPE
1.1 This specification covers a crosslinked polyethylene insulation for electrical wires and cables for conductor sizes 8 AWG (8.37 mm2) and larger. The base polymer of this insulation consists substantially of polyethylene.
1.2 This type of insulation is suitable for use on power cables in wet and dry locations at conductor temperatures not exceeding 90°C for continuous operation, 130°C for emergency overload conditions, and 250°C for short-circuit conditions. It is considered suitable for all sizes and voltage classifications of single- and multiple-conductor power cables at voltage ratings of 2001 to 35000 V phase-to-phase at the 100 % insulation level and at voltage ratings of 2001 to 25000 V at the 133 % insulation level as listed in Table 1C of Test Methods D 470.
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.

General Information

• Status: Historical
• Publication Date: 30-Sep-2006
• ICS: 29.035.20 - Plastics and rubber insulating materials
• Technical Committee: D09 - Electrical and Electronic Insulating Materials

Relations

• Replaces: ASTM D2656-00 - Standard Specification for Crosslinked Polyethylene Insulation for Wire and Cable Rated 2001 to 35 000 V
• Effective Date: 01-Oct-2006

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:D2656 −06 AnAmerican National Standard
Standard Specification for
Crosslinked Polyethylene Insulation for Wire and
1
Cable Rated 2001 to 35 000 V
This standard is issued under the fixed designation D2656; 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* D1248 Specification for Polyethylene Plastics Extrusion
Materials for Wire and Cable
1.1 This specification covers a crosslinked polyethylene
D1711 Terminology Relating to Electrical Insulation
insulation for electrical wires and cables for conductor sizes 8
2 D2765 Test Methods for Determination of Gel Content and
AWG (8.37 mm ) and larger. The base polymer of this
Swell Ratio of Crosslinked Ethylene Plastics
insulation consists substantially of polyethylene.
2.2 ICEA Standard:
1.2 This type of insulation is suitable for use on power
ICEAT-28-562 Test Method for Measurement of Hot Creep
cables in wet and dry locations at conductor temperatures not 3
of Polymeric Insulation
exceeding 90 °C for continuous operation, 130 °C for emer-
gency overload conditions, and 250 °C for short-circuit con-
3. Terminology
ditions. It is considered suitable for all sizes and voltage
3.1 Definitions:
classifications of single- and multiple-conductor power cables
3.1.1 For definitions of terms used in this specification refer
at voltage ratings of 2001 to 35 000 V phase-to-phase at the
to Terminology D1711.
100 %insulationlevelandatvoltageratingsof2001to25 000
3.2 Definitions of Terms Specific to This Standard:
V at the 133 % insulation level as listed in Table 1C of Test
3.2.1 aging (act of), n—exposure of materials to air at 121
Methods D470.
°C for 168 h.
1.3 Materials covered by this specification are not sunlight-
4. Physical Properties
and weather-resistant unless they are carbon black pigmented
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
5. Electrical Requirements
it has been formed around a conductor. Therefore, tests are
done on insulated wire in this standard solely to determine the
5.1 Order of Testing—Perform the partial-discharge, ac
relevant property of the insulation and not to test the conductor
voltage, insulation resistance, and dc voltage tests in that order
or completed cable.
when any of these tests are specified. The sequence for other
testing is not specified.
1.5 Whenever two sets of values are presented, in different
units, the values in the first set are the standard, while those in
5.2 Partial Discharge (Corona) Extinction Voltage—Each
parentheses are for information only.
length of completed power cable with shielded conductors
shall comply with the minimum level specified in Table 2.
2. Referenced Documents
Conduct the tests in accordance with Test Methods D470.
2
2.1 ASTM Standards:
5.3 AC Voltage Test—Subject the wires and cables to an ac
D470 Test Methods for Crosslinked Insulations and Jackets
test voltage for a period of 5 min. Unless otherwise specified,
for Wire and Cable
omit this test if the dc voltage test described in 5.5 is to be
performed. Test at a voltage of 125 V/mil (5 kV/mm) based on
1
This specification is under the jurisdiction of ASTM Committee D09 on
the specified nominal thickness of insulation for the rated
Electrical and Electronic Insulating Materials and is the direct responsibility of
circuit voltage, phase to phase. Conduct the test in accordance
Subcommittee D 09.18 on Solid Insulations, Non-Metallic Shieldings, and Cover-
with Test Methods D470.
ings for Electrical and Telecommunications Wires and Cables.
Current edition approved Oct. 1, 2006. Published October 2006. Originally
5.4 Insulation Resistance—The insulated conductor shall
approved in 1967. Last previous edition approved in 2000 as D2656 – 00. DOI:
have an insulation resistance equal to or greater than that
10.1520/D2656-06.
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
3
Standards volume information, refer to the standard’s Document Summary page on Available from The Insulated Cable Engineers Association, Inc. (ICEA), P.O.
the ASTM website. Box 1568, Carrollton, GA 30112, http://www.icea.net.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D2656−06
TABLE 1 Physical Properties for Crosslinked
5.5.1 Uponcompletionofth
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