ASTM B779 - 14

    Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Steel-Reinforced (ACSR/TW)

    Active Standard ASTM B779 | Developed by Subcommittee: B01.07

    Book of Standards Volume: 02.03


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    ASTM B779

    Abstract

    This specification covers shaped wire compact concentric-lay-stranded aluminum conductor, steel-reinforced (ACSR/TW) and its component wires for use as overhead electrical conductors. Requirements for (1) wire stranding (2) tensile strength and elongation, (3) joints such as electric-butt welds, electric-butt cold-upset welds, or cold-pressure welds, and (4) lay length, diameter, direction, and factor are detailed. The construction requirements include: nominal aluminum cross sectional area, conductor type, nominal number of aluminum wires, number of layers, number and diameter of the steel core wire, mass per unit length, rated strength, and outside diameter of the shaped wire compact. The methods of determining mass per unit length, cross-section, and electrical resistance of the stranded conductor are given. Mechanical and electrical tests shall be performed before stranding.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    1. Scope

    1.1 This specification covers shaped wire compact concentric-lay-stranded aluminum conductor, steel-reinforced (ACSR/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 standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

    Note 1ACSR/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 round steel wire(s) surrounded by two or more layers of trapezoidal aluminum 1350-H19 wires. Different strandings of the same size of conductor are identified by type, which is the approximate ratio of steel area to aluminum area expressed in percent (Table 1, Table 2 and Table 3). For the purpose of this specification, the sizes listed in Table 1 and Table 2 are tabulated on the basis of the finished conductor having an area or outside diameter equal to that of specific sizes of standard ACSR so as to facilitate conductor selection.
    TABLE 1 Construction Requirements for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated Steel Reinforced Size to Have Area Equal to ACSR, Class AA

    ACSR/TW Conductor
    Size

    Size and Stranding of ACSR with Equal Area

    Number of Aluminum Wires

    Number of Layers

    Steel Core Stranding

    Mass per Unit Length,A
    lb/1000 ft

    Rated
    Strength,
    1000 lbB

    Nominal
    Outside
    Diameter, in.

    kcmil

    Type

    kcmil

    Stranding

    Number of Wires

    Diameter,
    in.

     336.4

     6

     336.4

    18/1

    14

    2

    1

    0.1367

     365

     8.6

    0.63

     477.0

    13

     477.0

    24/7

    18

    2

    7

    0.0940

     613

    17.2

    0.78

     477.0

    16

     477.0

    26/7

    18

    2

    7

    0.1053

     655

    19.4

    0.79

     556.5

    13

     556.5

    24/7

    18

    2

    7

    0.1015

     715

    20.0

    0.84

     556.5

    16

     556.5

    26/7

    20

    2

    7

    0.1138

     765

    22.6

    0.85

     636.0

     3

     636.0

    36/1

    27

    3

    1

    0.1329

     646

    13.5

    0.85

     636.0

    13

     636.0

    24/7

    18

    2

    7

    0.1085

     816

    22.9

    0.89

     636.0

    16

     636.0

    26/7

    20

    2

    7

    0.1216

     874

    25.4

    0.91

     795.0

     7

     795.0

    45/7

    17

    2

    7

    0.0886

     892

    21.0

    0.96

     795.0

    10

     795.0

    22/7

    18

    2

    7

    0.1108

     975

    25.9

    0.98

     795.0

    13

     795.0

    54/7

    20

    2

    7

    0.1213

    1021

    28.2

    0.99

     795.0

    16

     795.0

    26/7

    20

    2

    7

    0.1360

    1092

    31.8

    1.01

     954.0

     5

     954.0

    42/7

    30

    3

    7

    0.0837

    1029

    23.7

    1.05

     954.0

     7

     954.0

    45/7

    32

    3

    7

    0.0971

    1075

    25.9

    1.06

     954.0

    13

     954.0

    54/7

    20

    2

    7

    0.1329

    1226

    33.5

    1.08

    1033.5

     5

    1033.5

    42/7

    30

    3

    7

    0.0871

    1115

    25.7

    1.09

    1033.5

     7

    1033.5

    45/7

    32

    3

    7

    0.1010

    1165

    28.1

    1.10

    1033.5

    13

    1033.5

    54/7

    21

    2

    7

    0.1363

    1327

    36.3

    1.13

    1113.0

     5

    1113.0

    42/7

    30

    3

    7

    0.0904

    1201

    27.5

    1.13

    1113.0

     7

    1113.0

    45/7

    33

    3

    7

    0.1049

    1254

    30.3

    1.14

    1113.0

    13

    1113.0

     54/19

    38

    3

    19

    0.0862

    1429

    39.1

    1.19

    1192.5

     5

    1192.5

    42/7

    30

    3

    7

    0.0936

    1286

    29.5

    1.17

    1192.5

     7

    1192.5

    45/7

    33

    3

    7

    0.1085

    1343

    32.4

    1.18

    1192.5

    13

    1192.5

     54/19

    38

    3

    19

    0.0892

    1530

    41.9

    1.22

    1272.0

     5

    1272.0

    42/7

    30

    3

    7

    0.0967

    1372

    31.4

    1.20

    1272.0

     7

    1272.0

    45/7

    35

    3

    7

    0.1121

    1433

    34.6

    1.22

    1272.0

    13

    1272.0

     54/19

    39

    3

    19

    0.0921

    1632

    44.1

    1.26

    1351.5

     7

    1351.5

    45/7

    35

    3

    7

    0.1155

    1522

    36.7

    1.26

    1351.5

    13

    1351.5

     54/19

    39

    3

    19

    0.0949

    1734

    46.8

    1.30

    1431.0

     7

    1431.0

    45/7

    36

    3

    7

    0.1189

    1613


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    B230/B230M Specification for Aluminum 1350-H19 Wire for Electrical Purposes

    B232/B232M Specification for Concentric-Lay-Stranded Aluminum Conductors, Coated-Steel Reinforced (ACSR)

    B263 Test Method for Determination of Cross-Sectional Area of Stranded Conductors

    B354 Terminology Relating to Uninsulated Metallic Electrical Conductors

    B498/B498M Specification for Zinc-Coated (Galvanized) Steel Core Wire for Use in Overhead Electrical Conductors

    B500/B500M Specification for Metallic Coated or Aluminum Clad Stranded Steel Core for Use in Overhead Electrical Conductors

    B502 Specification for Aluminum-Clad Steel Core Wire for Use in Overhead Electrical Aluminum Conductors

    B549 Specification for Concentric-Lay-Stranded Aluminum Conductors, Aluminum-Clad Steel Reinforced for Use in Overhead Electrical Conductors

    B606 Specification for High-Strength Zinc-Coated (Galvanized) Steel Core Wire for Aluminum and Aluminum-Alloy Conductors, Steel Reinforced

    B802/B802M Specification for Zinc-5 % Aluminum-Mischmetal Alloy-Coated Steel Core Wire for Aluminum Conductors, Steel Reinforced (ACSR)

    B803 Specification for High-Strength Zinc-5 % Aluminum-Mischmetal Alloy-Coated Steel Core Wire for Use in Overhead Electrical Conductors

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)

    Other Documents

    NBS Handbook 100--Copper Wire Tables of the National Bureau of Standards Available from National Technical Information Service (NTIS), 5285 Port Royal Rd., Springfield, VA 22161, http://www.ntis.gov.


    ICS Code

    ICS Number Code 29.240.20 (Power transmission and distribution lines)

    UNSPSC Code

    UNSPSC Code 26121500(Electrical wire)


    DOI: 10.1520/B0779

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