ASTM B786-02

Standard Specification for 19 Wire Combination Unilay-Stranded Aluminum Conductors for Subsequent Insulation

SCOPE
1.1 This specification covers bare combination unilay-stranded conductors made from round wires of aluminum 1350 and 8000 series of aluminum alloys, for insulated conductors for electrical purposes. Aluminum 1350 wires in tempers -H19 (extra hard), -H16 or -H26 (3/4 hard), -H14 or -H24 (1/2 hard), and -H142 or -H242 (1/2 hard) and 8000 series aluminum alloys wires in tempers "0" and H1X or H2X are permitted. These conductors shall be constructed with a central core wire surrounded by two layers of helically laid wires, resulting in an outer diameter equal to the compressed-stranded equivalent conductors.
Note 1—For the purpose of this specification, combination unilay conductor is defined as follows: a central core wire surrounded by a layer of six helically laid wires of the same diameter as the core wire with a helically laid outer layer containing six smaller wires alternated between six wires of the same diameter as the wires in the layer underneath. Both layers have a common length and direction of lay (see Fig. 1).
1.1.1 For the purpose of this specification, normal conductor classification (Class AA, A, B, C) is not applicable, as these conductors are intended for subsequent insulation. The descriptive term combination unilay-stranded shall be used in place of conductor classification (Note 2 and Note 3).
Note 2—Prior to 1975, aluminum 1350 was designated as EC aluminum.
Note 3—The aluminum and temper designations conform to ANSI Standard H35.1. Aluminum 1350 corresponds to Unified Numbering System A91350 in accordance with Practice E 527. Unified Numbering System alloy designations for 8000 Series aluminum alloys in accordance with Practice E 527 are listed in Table 1 of Specification B 800.
1.2 The values stated in inch-pound or SI units are to be regarded separately as standard. The values in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
1.2.1 For density, resistivity and temperature, the values stated in SI units are to be regarded as standard.

General Information

• Status: Historical
• Publication Date: 09-Apr-2002
• ICS: 29.060.20 - Cables
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.07 - Conductors of Light Metals

Relations

• Replaces: ASTM B786-00 - Standard Specification for 19 Wire Combination Unilay-Stranded Aluminum Conductors for Subsequent Insulation
• Effective Date: 10-Apr-2002
• Replaced By: ASTM B786-02a - Standard Specification for 19 Wire Combination Unilay-Stranded Aluminum Conductors for Subsequent Insulation
• Effective Date: 10-Oct-2002

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: B 786 – 02
Standard Specification for
19 Wire Combination Unilay-Stranded Aluminum
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Conductors for Subsequent Insulation
This standard is issued under the fixed designation B 786; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
1.1 This specification covers bare combination unilay- 2.1 The following documents of the issue in effect on date
stranded conductors made from round wires of aluminum 1350 of material purchase form a part of this specification to the
and 8000 series of aluminum alloys, for insulated conductors extent referenced herein.
for electrical purposes. Aluminum 1350 wires in tempers -H19 2.2 ASTM Standards:
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(extra hard), -H16 or -H26 ( ⁄4 hard), -H14 or -H24 ( ⁄2 hard), B 193 Test Method for Resistivity of Electrical Conductor
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and -H142 or -H242 ( ⁄2 hard) and 8000 series aluminum alloys Materials
wires in tempers “0” and H1X or H2X are permitted. These B 230 Specification for Aluminum 1350-H19 Wire for Elec-
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conductors shall be constructed with a central core wire trical Purposes
surrounded by two layers of helically laid wires, resulting in an B 263 Test Method for Determination of Cross-Sectional
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outer diameter equal to the compressed-stranded equivalent Area of Stranded Conductors
conductors. B 609 Specification for Aluminum 1350 Round Wire, An-
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nealed and Intermediate Tempers, for Electrical Purposes
NOTE 1—For the purpose of this specification, combination unilay
B 800 Specification for 8000 Series Aluminum Alloy Wire
conductor is defined as follows: a central core wire surrounded by a layer
for Electrical Purposes—Annealed and Intermediate Tem-
of six helically laid wires of the same diameter as the core wire with a
2
helically laid outer layer containing six smaller wires alternated between pers
six wires of the same diameter as the wires in the layer underneath. Both
B 801 Specification for Concentric-Lay-Stranded Conduc-
layers have a common length and direction of lay (see Fig. 1).
tors of 8000 Series Aluminum Alloy for Subsequent
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Covering or Insulation
1.1.1 For the purpose of this specification, normal conductor
E 29 Practice for Using Significant Digits in Test Data to
classification (Class AA, A, B, C) is not applicable, as these
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Determine Conformance with Specifications
conductors are intended for subsequent insulation. The descrip-
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E 527 Practice for Numbering Metals and Alloys (UNS)
tive term combination unilay-stranded shall be used in place of
2.3 ANSI Standard:
conductor classification (Note 2 and Note 3).
ANSI H35.1 Alloy and Temper Designation Systems for
NOTE 2—Prior to 1975, aluminum 1350 was designated as EC alumi-
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Aluminum
num.
2.4 NIST Standard:
NOTE 3—The aluminum and temper designations conform to ANSI
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NBS Handbook 100
Standard H35.1. Aluminum 1350 corresponds to Unified Numbering
System A91350 in accordance with Practice E 527. Unified Numbering
3. Ordering Information
System alloy designations for 8000 Series aluminum alloys in accordance
with Practice E 527 are listed in Table 1 of Specification B 800.
3.1 Orders for materials under this specification shall in-
clude the following information:
1.2 The values stated in inch-pound or SI units are to be
3.1.1 Conductor alloy,
regarded separately as standard. The values in each system are
3.1.2 Quantity of each size,
not exact equivalents; therefore, each system shall be used
3.1.3 Conductor size: Circular-mil area or American Wire
independently of the other. Combining values from the two
Gage, AWG (Section 6 and Table 1),
systems may result in nonconformance with the specification.
3.1.4 Stranding (see Explanatory Note 1),
1.2.1 For density, resistivity and temperature, the values
stated in SI units are to be regarded as standard.
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Annual Book of ASTM Standards, Vol 02.03.
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Annual Book of ASTM Standards, Vol 14.02.
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This specification is under the jurisdiction of ASTM Committee B01 on Annual Book of ASTM Standards, Vol 01.01.
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Electrical Conductors and is the direct responsibility of Subcommittee B01.07 on Available from American National Standards Institute, 11 West 42nd St., 13th
Conductors of Light Metals. Floor, New York, NY 10036.
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Current edition approved April 10, 2002. Published May 2002. Originally Available from the National Institute of Standards and Technology, (NIST),
published as B 786 – 88. Last previous edition B 786 – 00. Gaithersburg, MD 20899.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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