ASTM B778-02
(Specification)Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors (AAC/TW)
Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors (AAC/TW)
SCOPE
1.1 This specification covers shaped wire compact concentric-lay-stranded aluminum conductor (AAC/TW) and its component wires for use as overhead electrical conductors (Explanatory Note 1 and Note 2).
1.2 The values stated in inch-pound units are to be regarded as the standard with the exception of temperature and resistivity. The SI equivalents of inch-pound units may be approximate.
Note 1—AAC/TW is designed to increase the aluminum area for a given diameter of conductor by the use of trapezoidally shaped wires (TW). The conductors consist of a central core of one round aluminum wire or a seven-strand compact round core surrounded by two or more layers of trapezoidal aluminum 1350-H19 wires. For the purposes of this specification, the sizes listed are tabulated on the basis of the finished conductor having an area equal to that of specific sizes of standard AAC (Table 1) or in fixed diameter increments (Table 2) so as to facilitate conductor selection.
Note 2—The aluminum and temper designations conform to ANSI Standard H 35.1. Aluminum 1350 corresponds to Unified Numbering System (UNS) A91350 in accordance with Practice E 527.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: B 778 – 02
Standard Specification for
Shaped Wire Compact Concentric-Lay-Stranded Aluminum
1
Conductors (AAC/TW)
This standard is issued under the fixed designation B 778; 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.
4
1. Scope E 527 Practice for Numbering Metals and Alloys (UNS)
2.3 Other Documents:
1.1 This specification covers shaped wire compact
ANSI H35.1 American National Standard Alloy and Tem-
concentric-lay-stranded aluminum conductor (AAC/TW) and
5
per Designation Systems for Aluminum
its component wires for use as overhead electrical conductors
6
NBS Handbook 100—Copper Wire Tables
(Explanatory Note 1 and Note 2).
Aluminum Association Publication 50 Code Words for
1.2 The values stated in inch-pound units are to be regarded
7
Overhead Aluminum Electrical Conductors
as the standard with the exception of temperature and resistiv-
ity. The SI equivalents of inch-pound units may be approxi-
3. Ordering Information
mate.
3.1 Orders for material under this specification shall include
NOTE 1—AAC/TW is designed to increase the aluminum area for a
the following information:
given diameter of conductor by the use of trapezoidally shaped wires
3.1.1 Quantity of each size,
(TW). The conductors consist of a central core of one round aluminum
3.1.2 Conductor size: kcmil area and diameter (Table 1 and
wire or a seven-strand compact round core surrounded by two or more
Table 2),
layers of trapezoidal aluminum 1350-H19 wires. For the purposes of this
3.1.3 Special tension test, if required (see 8.2),
specification, the sizes listed are tabulated on the basis of the finished
conductor having an area equal to that of specific sizes of standard AAC
3.1.4 Place of inspection (Section 15),
(Table 1) or in fixed diameter increments (Table 2) so as to facilitate
3.1.5 Package size and type (see 15.1),
conductor selection.
3.1.6 Special package markings, if required (Section 15),
NOTE 2—The aluminum and temper designations conform to ANSI
and
Standard H 35.1. Aluminum 1350 corresponds to Unified Numbering
3.1.7 Heavy wood lagging, if required (see 15.3).
System (UNS) A91350 in accordance with Practice E 527.
4. Requirement for Wires
2. Referenced Documents
4.1 Before stranding, the trapezoidal aluminum wires shall
2.1 The following documents of the issue in effect on date
conform to the requirements of Specification B 230 except for
of material purchase form a part of this specification to the
shape and diameter tolerance. The tensile strength and elonga-
extent referenced herein.
tion requirements of trapezoidal wires shall be the same as for
2.2 ASTM Standards:
round wires of equal area. The area tolerances shall be such
B 230 SpecificationforAluminum1350-H19WireforElec-
2
that the finished conductor conforms to Section 11.
trical Purposes
B 263 Test Method for Determination of Cross-Sectional
5. Joints
2
Area of Stranded Conductors
5.1 Electric-butt welds, electric-butt cold-upset welds, or
B 354 Terminology Relating to Uninsulated Metallic Elec-
2 cold-pressure welds may be made in the individual aluminum
trical Conductors
wires during the stranding process. No weld shall occur within
E 29 Practice for Using Significant Digits in Test Data to
3 50 ft (15 m) of any other weld in the completed conductor
Determine Conformance with Specifications
(Explanatory Note 3).
1 4
This specification is under the jurisdiction of ASTM Committee B01 on Annual Book of ASTM Standards, Vol 01.01.
5
Electrical Conductors and is the direct responsibility of Subcommittee B 01.07 on Available from American National Standards Institute, 25 W. 43rd Street, 4th
Conductors of Light Metals. Floor, New York, NY 10036.
6
Current edition approved Oct. 10, 2002. Published December 2002. Originally Available from National Institute of Standards and Technology (NIST), 100
approved in 1987. Last previous edition approved in 1997 as B 778 – 97.
Bureau Dr., Stop 3460, Gaithersburg, MD 20899-3460.
2 7
Annual Book of ASTM Standards, Vol 02.03. Available from the Aluminum Association, Inc., 900 19th Street, NW, Suite
3
Annual Book of ASTM Standards, Vol 14.02. 300, Washington, D.C. 2006.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
B 778–02
TABLE 1 Construction Requirements for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors Sized to Have Areas
Equal to AAC Size
AAC/TW Nominal Outside
Number of
Nominal Mass Rated Strength
Number
A
Conductor size Diameter
Code Word Aluminum
of Layers
Wires
kcmil mm in.
...
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: B 778 – 02
Standard Specification for
Shaped Wire Compact Concentric-Lay-Stranded Aluminum
1
Conductors (AAC/TW)
This standard is issued under the fixed designation B 778; 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.
4
1. Scope E 527 Practice for Numbering Metals and Alloys (UNS)
2.3 Other Documents:
1.1 This specification covers shaped wire compact
ANSI H35.1 American National Standard Alloy and Tem-
concentric-lay-stranded aluminum conductor (AAC/TW) and
5
per Designation Systems for Aluminum
its component wires for use as overhead electrical conductors
6
NBS Handbook 100—Copper Wire Tables
(Explanatory Note 1 and Note 2).
Aluminum Association Publication 50 Code Words for
1.2 The values stated in inch-pound units are to be regarded
7
Overhead Aluminum Electrical Conductors
as the standard with the exception of temperature and resistiv-
ity. The SI equivalents of inch-pound units may be approxi-
3. Ordering Information
mate.
3.1 Orders for material under this specification shall include
NOTE 1—AAC/TW is designed to increase the aluminum area for a
the following information:
given diameter of conductor by the use of trapezoidally shaped wires
3.1.1 Quantity of each size,
(TW). The conductors consist of a central core of one round aluminum
3.1.2 Conductor size: kcmil area and diameter (Table 1 and
wire or a seven-strand compact round core surrounded by two or more
Table 2),
layers of trapezoidal aluminum 1350-H19 wires. For the purposes of this
3.1.3 Special tension test, if required (see 8.2),
specification, the sizes listed are tabulated on the basis of the finished
conductor having an area equal to that of specific sizes of standard AAC
3.1.4 Place of inspection (Section 15),
(Table 1) or in fixed diameter increments (Table 2) so as to facilitate
3.1.5 Package size and type (see 15.1),
conductor selection.
3.1.6 Special package markings, if required (Section 15),
NOTE 2—The aluminum and temper designations conform to ANSI
and
Standard H 35.1. Aluminum 1350 corresponds to Unified Numbering
3.1.7 Heavy wood lagging, if required (see 15.3).
System (UNS) A91350 in accordance with Practice E 527.
4. Requirement for Wires
2. Referenced Documents
4.1 Before stranding, the trapezoidal aluminum wires shall
2.1 The following documents of the issue in effect on date
conform to the requirements of Specification B 230 except for
of material purchase form a part of this specification to the
shape and diameter tolerance. The tensile strength and elonga-
extent referenced herein.
tion requirements of trapezoidal wires shall be the same as for
2.2 ASTM Standards:
round wires of equal area. The area tolerances shall be such
B 230 SpecificationforAluminum1350-H19WireforElec-
2
that the finished conductor conforms to Section 11.
trical Purposes
B 263 Test Method for Determination of Cross-Sectional
5. Joints
2
Area of Stranded Conductors
5.1 Electric-butt welds, electric-butt cold-upset welds, or
B 354 Terminology Relating to Uninsulated Metallic Elec-
2 cold-pressure welds may be made in the individual aluminum
trical Conductors
wires during the stranding process. No weld shall occur within
E 29 Practice for Using Significant Digits in Test Data to
3 50 ft (15 m) of any other weld in the completed conductor
Determine Conformance with Specifications
(Explanatory Note 3).
1 4
This specification is under the jurisdiction of ASTM Committee B01 on Annual Book of ASTM Standards, Vol 01.01.
5
Electrical Conductors and is the direct responsibility of Subcommittee B 01.07 on Available from American National Standards Institute, 25 W. 43rd Street, 4th
Conductors of Light Metals. Floor, New York, NY 10036.
6
Current edition approved Oct. 10, 2002. Published December 2002. Originally Available from National Institute of Standards and Technology (NIST), 100
approved in 1987. Last previous edition approved in 1997 as B 778 – 97.
Bureau Dr., Stop 3460, Gaithersburg, MD 20899-3460.
2 7
Annual Book of ASTM Standards, Vol 02.03. Available from the Aluminum Association, Inc., 900 19th Street, NW, Suite
3
Annual Book of ASTM Standards, Vol 14.02. 300, Washington, D.C. 2006.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
B 778–02
TABLE 1 Construction Requirements for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors Sized to Have Areas
Equal to AAC Size
AAC/TW Nominal Outside
Number of
Nominal Mass Rated Strength
Number
A
Conductor size Diameter
Code Word Aluminum
of Layers
Wires
kcmil mm in.
...
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