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    ASTM

    ASTM B779 : 12

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

    Standard Details

    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 1—ACSR/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

    Status : Historical
    Standard Type: Main
    Document No: ASTM B779 : 12
    Document Year: 2012
    Pages: 6
    • Section Volume:
    • 02.03 Volume 02.03 Electrical Conductors
    • ICS:
    • 29.240.20 Power transmission and distribution lines
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