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ASTM
ASTM B 857 : 2011 : EDT 1

ASTM B 857 : 2011 : EDT 1

Superseded

Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by

Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated-Steel Supported (ACSS/TW)

Available format(s)

Hardcopy , PDF

Superseded date

11-11-2014

Superseded by

ASTM B 857 : 2011 : EDT 2

Language(s)

English

Published date

01-04-2011

Publisher

American Society for Testing and Materials

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Hardcopy - English
PDF - English
01
02
03
04
05
06
07
08
09
10

Committee
B 01
DocumentType
Standard
Pages
8
PublisherName
American Society for Testing and Materials
Status
Superseded
SupersededBy
Supersedes

1.1This specification covers shaped wire compact concentric-lay-stranded aluminum conductors, steel supported (ACSS/TW) for use as overhead electrical conductors (see Explanatory Note 1).

1.2The 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.

1.2.1Exceptions—For conductor sizes designated by AWG or kcmil sizes, the requirements in SI units are numerically converted from the corresponding requirements in inch-pound units. For conductor sizes designated by SI units only, the requirements are stated or derived in SI units. For density, resistivity, and temperature, the values stated in SI units are to be regarded as standard.

1.3ACSS/TW is designed to increase the aluminum area for a given diameter of conductor by the use of trapezoidal shaped wires (TW), or to reduce the diameter for a given area of aluminum. The conductors consist of a central core of round steel wire(s) surrounded by two or more layers of trapezoidal aluminum 1350-0 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 (see 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 specified sizes of standard ACSR, ACSS, and ACSR/TW so as to facilitate conductor selection.

TABLE 1 Construction Requirements for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated Steel SupportedA
Note 1—Sized to have area equal aluminum cross-sectional area to an ACSR or ACSS, Class AA conductor.

ACSS/TW
Conductor Size

Code WordB

Size and Stranding
of ACSS
with Equal Aluminum
Cross-Sectional Area

Aluminum
Stranding

Steel Core
Stranding

Nominal Mass
ACSS/TW

ACSS/TW Conductor Rated Strength
(by type of steel core wire)

Nominal
Outside
Diameter

kcmilC

Type

kcmil

Stranding

Number
of
Aluminum
Wires

Number
of
Layers

Number
of
Wires

Individual Strand Wire
Diameter,
in.

GAX Core
lb/1000 ft

GA2 / MA2 KIPS

GA3 / MA3 KIPS

GA4 / MA4 KIPS

GA5 / MA5 KIPS

AW2 KIPS

AW3
KIPS

in.

266.8

16

Partridge/ACSS/TW

266.8

26/7

18

2

7

0.0788

349

8.90

9.70

10.8

11.4

8.40

8.90

0.58

 336.4

23

Oriole/ACSS/TW

 336.4

30/7

17

2

 7

0.1059

 526

14.8

16.3

18.2

19.1

14.2

14.8

0.69

 477.0

13

Flicker/ACSS/TW

 477.0

24/7

18

2

 7

0.0940

 612

13.0

14.2

15.7

16.4

12.5

13.0

0.78

 477.0

16

Hawk/ACSS/TW

 477.0

26/7

18

2

 7

0.1053

 655

15.6

17.1

18.9

19.8

14.9

15.6

0.79

 477.0

23

Hen/ACSS/TW

 477.0

30/7

17

2

 7

0.1261

 746

21.0

22.7

25.4

26.7

20.1

20.5

0.83

 556.5

13

Parakeet/ACSS/TW

 556.5

24/7

18

2

 7

0.1015

 714

15.2

16.6

18.3

19.1

14.6

15.2

0.84

 556.5

16

Dove/ACSS/TW

 556.5

26/7

20

2

 7

0.1138

 764

19.9

18.2

22.1

23.1

17.5

18.2

0.85

 636.0

13

Rook/ACSS/TW

 636.0

24/7

18

2

 7

0.1085

 818

19.0

17.3

20.9

21.9

16.7

17.3

0.89

 636.0

16

Grosbeak/ACSS/TW

 636.0

26/7

20

2

 7

0.1216

 873

22.4

20.7

24.8

26.0

19.9

20.3

0.91

 795.0

 7

Tern/ACSS/TW

 795.0

45/7

17

2

 7

0.0886

 891

15.2

14.2

16.6

17.5

13.5

14.2

0.96

 795.0

10

Puffin/ACSS/TW

 795.0

22/7

18

2

 7

0.1108

 974

20.6

18.9

22.6

23.7

18.3

18.9

0.98

 795.0

13

Condor/ACSS/TW

 795.0

54/7

20

2

 7

0.1213

1020

23.3

21.7

25.7

26.9

20.9

21.3

0.99

 795.0

16

Drake/ACSS/TW

 795.0

26/7

20

2

 7

0.1360

1091

28.0

25.9

31.0

32.5

24.4

25.4

1.01

 795.0

23

Mallard/ACSS/TW

 795.0

30/19

22

2

19

0.0977

1234

37.9

34.3

42.1

44.3

32.9

34.3

1.05

 954.0

 5

Phoenix/ACSS/TW

 954.0

42/7

30

3

 7

0.0837

1028

15.2

14.2

16.3

17.1

13.6

14.2

1.05

 954.0

 7

Rail/ACSS/TW

 954.0

45/7

32

3

 7

0.0971

1074

18.0

16.7

19.6

20.4

16.2

16.7

1.06

 954.0

13

Cardinal/ACSS/TW

 954.0

54/7

20

2

 7

0.1329

1227

28.0

26.0

30.9

32.3

24.6

25.5

1.08

1033.5

 5

Snowbird/ACSS/TW

1033.5

42/7

30

3

 7

0.0871

1114

16.4

15.4

17.7

18.5

14.8

15.4

1.09

1033.5

 7

Ortolan/ACSS/TW

1033.5

45/7

32

3

 7

0.1010

1163

19.5

18.1

21.2

22.0

17.6

18.1

1.10

1033.5

13

Curlew/ACSS/TW

1033.5

54/7

21

2

 7

0.1383

1326

30.3

28.2

33.4

35.0

26.1

27.7

1.13

1113.0

 5

Avocet/ACSS/TW

1113.0

42/7

30

3

 7

0.0904

1199

17.5

16.3

18.8

19.5

15.9

16.3

1.13

1113.0

 7

Bluejay/ACSS/TW

1113.0

45/7

33

3

 7

0.1049

1253

21.0

19.5

22.9

23.8

18.9

19.5

1.14

1113.0

13

Finch/ACSS/TW

1113.0

54/19

38

3

19

0.0862

1427

33.2

30.4

36.5

38.7

28.8

30.4

1.19

1192.5

 5

Oxbird/ACSS/TW

1192.5

42/7

30

3

 7

0.0936

1285

18.7

17.5

20.2

20.9

17.0

17.5

1.17

1192.5

 7

Bunting/ACSS/TW

1192.5

45/7

33

3

 7

0.1085

1342

22.5

20.9

24.5

25.5

20.3

20.9

1.18

1192.5

13

Grackle/ACSS/TW

1192.5

54/19

38

3

19

0.0892

1529

35.5

32.6

39.1

41.5

30.8

32.6

1.22

1272.0

 5

Scissortail/ACSS/TW

1272.0

42/7

30

3

 7

0.0967

1371

20.0

18.7

21.5

22.3

18.2

18.7

1.20

1272.0

 7

Bittern/ACSS/TW

1272.0

45/7

35

3

 7

0.1121

1432

24.0

22.3

26.1

27.2

21.6

22.3

1.22

1272.0

13

Pheasant/ACSS/TW

1272.0

54/19

39

3

19

0.0921

1630

37.3

34.1

41.1

43.0

32.8

34.1

1.26

1351.5

 7

Dipper/ACSS/TW

1351.5

45/7

35

3

 7

0.1155

1521

25.5

23.7

27.7

28.8

23.0

23.7

1.26

1351.5

13

Martin/ACSS/TW

1351.5

54/19

39

3

19

0.0949

1732

39.6

36.2

43.6

45.6

34.9

36.2

1.30

1431.0

 7

Bobolink/ACSS/TW

1431.0

45/7

36

3

 7

0.1189

1611

27.0

25.1

29.4

30.5

24.3

25.1

1.29

1431.0

13

Plover/ACSS/TW

1431.0

54/19

39

3

19

0.0977

1834

41.9

38.4

46.2

48.3

36.9

38.4

1.34

1590.0

 7

Lapwing/ACSS/TW

1590.0

45/7

36

3

 7

0.1253

1790

29.6

27.9

32.2

33.5

27.0

27.5

1.36

1590.0

13

Falcon/ACSS/TW

1590.0

54/19

42

3

19

0.1030

2038

46.6

42.6

51.3

53.7

41.1

42.6

1.41

1780.0

 8

Chukar/ACSS/TW

1780.0

84/19

37

3

19

0.0874

2061

38.2

35.3

41.6

43.9

33.6

35.3

1.45

2156.0

 8

Bluebird/ACSS/TW

2156.0

84/19

64

4

19

0.0961

2512

45.5

42.1

49.6

51.7

40.7

42.1

1.61

A Conversion factors:
   1 cmil = 5.067E−04 mm 2 (0.0005067 mm3)
   1 in. = 2.54E+01 mm (25.4 mm)
   1 lb/1000ft = 1.488 kg/km
   1 ft = 3.048E−01 m (0.3048 m)
   1 lb = 4.536E−01 kg (0.4536 kg)
   1 lbf = 4.448E−03 kN (0.0044448 kN)
B Code Words shown in this column are obtained from “Publication 50, Code Words for Overhead Aluminum Electrical Conductors,” by the Aluminum Association. They are provided for information only.
C See Explanatory Note 4.
TABLE 2 Construction Requirements for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated Steel SupportedA
Note 1—Sized to have a diameter equal to a concentric round ACSR or ACSS, Class AA conductor.

ACSS/TW
Conductor Size

Code WordB

Size and
Stranding
of ACSS
with Equal
Overall
Conductor
Diameter

Aluminum
Stranding

Steel Core Stranding

Nominal Mass ACSS/TW

ACSS/TW Conductor Rated Strength
(by type of steel core wire)

Nominal Outside
Diameter

kcmilC

Type

kcmil

Stranding

Number
of
Aluminum
Wires

Number
of
Layers

Number of
Wires

Individual Strand Wire Diameter,
in.

GAX Core lb/1000 ft

GA2/MA2
KIPS

GA3/MA3
KIPS

GA4 / MA4
KIPS

GA5 / MA5
KIPS

AW2
KIPS

AW3
KIPS

in.

 571.7

13

Mohawk/ACSS/TW

 477.0

24/7

18

2

 7

0.1030

 734

17.1

15.6

18.8

19.7

15.0

15.6

0.85

 565.3

16

Calumet/ACSS/TW

 477.0

26/7

20

2

 7

0.1146

 776

20.2

18.4

22.4

23.5

17.7

18.4

0.86

 666.6

13

Mystic/ACSS/TW

 556.5

24/7

20

2

 7

0.1111

 856

19.9

18.2

21.9

22.9

17.5

18.2

0.91

 664.8

16

Oswego/ACSS/TW

 556.5

26/7

20

2

 7

0.1244

 913

23.4

21.7

26.0

27.2

20.9

21.3

0.93

 768.2

13

Maumee/ACSS/TW

 636.0

24/7

20

2

 7

0.1195

 987

23.0

21.0

25.3

26.5

20.2

21.0

0.98

 762.8

16

Wabash/ACSS/TW

 636.0

26/7

20

2

 7

0.1331

1047

26.8

24.9

29.7

31.2

23.4

24.4

0.99

 957.2

 7

Kettle/ACSS/TW

 795.0

45/7

32

3

 7

0.0973

1078

18.1

16.8

19.7

20.4

16.3

16.8

1.06

 946.7

10

Fraser/ACSS/TW

 795.0

22/7

35

3

 7

0.1154

1140

22.9

21.1

25.1

26.2

20.3

21.1

1.08

 966.2

13

Columbia/ACSS/TW

 795.0

54/7

21

2

 7

0.1338

1240

28.3

26.4

31.3

32.8

24.9

25.9

1.09

 959.6

16

Suwannee/ACSS/TW

 795.0

26/7

22

2

 7

0.1493

1317

33.1

30.7

36.8

38.6

28.2

30.0

1.11

1080.0

 7

. . .

 900.0

45/7

20

2

 7

0.1033

1211

20.4

18.9

22.2

23.1

18.4

18.9

1.13

1168.1

 5

Cheyenne/ACSS/TW

 954.0

42/7

30

3

 7

0.0926

1259

18.3

17.2

19.7

20.4

16.7

17.1

1.16

1158.0

 7

Genesee/ACSS/TW

 954.0

45/7

33

3

 7

0.1078

1307

22.1

20.5

24.0

25.0

19.9

20.5

1.17

1158.4

13

Hudson/ACSS/TW

 954.0

54/7

25

2

 7

0.1467

1488

33.5

31.1

37.0

38.8

28.7

30.5

1.20

1272.0

 5

Catawba/ACSS/TW

1033.5

42/7

30

3

 7

0.0967

1371

20.0

18.7

21.5

22.3

18.2

18.7

1.20

1257.1

 7

Nelson/ACSS/TW

1033.5

45/7

35

3

 7

0.1115

1416

23.8

22.1

25.8

26.9

21.4

22.1

1.21

1233.6

13

Yukon/ACSS/TW

1033.5

54/7

38

3

19

0.0910

1584

36.3

33.2

40.0

41.9

32.0

33.2

1.25

1372.5

 5

Truckee/ACSS/TW

1113.0

42/7

30

3

 7

0.1004

1479

21.5

20.2

23.2

24.0

19.6

20.2

1.25

1359.7

 7

Mackenzie/ACSS/TW

1113.0

45/7

36

3

 7

0.1159

1531

25.7

23.9

27.9

29.0

23.1

23.8

1.26

1334.6

13

Thames/ACSS/TW

1113.0

54/19

39

3

19

0.0944

1711

39.1

35.8

43.1

45.1

34.5

35.8

1.29

1467.8

 5

St. Croix/ACSS/TW

1192.5

42/7

33

3

 7

0.1041

1583

23.1

21.6

24.9

25.8

21.0

21.6

1.29

1455.3

 7

Miramichi/ACSS/TW

1192.5

45/7

36

3

 7

0.1200

1639

27.1

25.6

29.5

30.7

24.8

25.2

1.30

1433.6

13

Merrimack/ACSS/TW

1192.5

54/19

39

3

19

0.0978

1838

42.0

38.4

46.3

48.4

37.0

38.4

1.34

1569.0

 5

Platte/ACSS/TW

1272.0

42/7

33

3

 7

0.1074

1691

24.6

23.1

26.5

27.5

22.4

23.1

1.33

1557.4

 7

Potomac/ACSS/TW

1272.0

45/7

36

3

 7

0.1241

1754

29.0

27.3

31.6

32.8

26.5

26.9

1.35

1533.3

13

Rio Grande/ACSS/TW

1272.0

54/19

39

3

19

0.1012

1966

45.0

41.2

49.6

51.9

39.6

41.2

1.38

1657.4

 7

Schuylkill/ACSS/TW

1351.5

45/7

36

3

 7

0.1280

1866

30.9

29.1

33.6

34.9

28.2

28.6

1.39

1622.0

13

Pecos/ACSS/TW

1351.5

54/19

39

3

19

0.1064

2105

49.3

45.0

54.3

56.9

43.3

45.0

1.42

1758.6

 7

Pee Dee/ACSS/TW

1431.0

45/7

37

3

 7

0.1319

1980

32.8

30.9

35.7

37.1

29.4

30.4

1.43

1730.6

13

James/ACSS/TW

1431.0

54/19

39

3

19

0.1075

2219

50.8

46.4

55.9

58.5

44.7

46.4

1.47

1949.6

 7

Athabaska/ACSS/TW

1590.0

45/7

42

3

 7

0.1392

2197

36.5

34.3

39.3

40.8

31.7

33.5

1.50

1926.9

13

Cumberland/ACSS/TW

1590.0

54/19

42

3

19

0.1133

2469

56.4

51.6

62.2

65.0

49.7

51.6

1.55

2153.8

 8

Powder/ACSS/TW

1780.0

84/19

64

4

19

0.0961

2510

45.5

42.1

49.6

51.7

40.7

42.1

1.60

2627.3

 8

Santee/ACSS/TW

2156.0

84/19

64

4

19

0.1062

3063

55.6

51.3

60.6

63.1

49.7

51.3

1.76

A Conversion factors:
   1 cmil = 5.067E−04 mm 2 (0.0005067 mm2)
   1 in. = 2.54E+01 mm (25.4 mm)
   1 lb/1000 ft = 1.488 kg/km
   1 ft = 3.048E−01 m (0.3048 m)
   1 lb = 4.536E−01 kg (0.4536 kg)
   1 lbf = 4.448E−03 kN (0.004448 kN)
B Code Words shown in this column are obtained from “Publication 50, Code Words for Overhead Aluminum Electrical Conductors,” by the Aluminum Association. They are provided for information only.
C See Explanatory Note 4.
TABLE 3 Comparison of ACSS/TW With Equivalent Stranding of ACSRA and ACSSB

ACSS/TW Type NumberC

Conventional ACSR and ACSS StrandingD

 5

42/7

 7

45/7

 8

 84/19

10

22/7

13

54/7

13

24/7

16

26/7

23

30/7

23

30/19

A The equivalent stranding is that stranding of conventional ACSR that has the same area of aluminum and steel as a given ACSS/TW type.
B The equivalent stranding is that stranding of conventional ACSS that has the same area of aluminum and steel as a given ACSS/TW type.
C ACSS/TW type number is the approximate ratio of the steel area to the aluminum area in percent.
D See Specifications B549 and B856.

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