ASTM B779-03(2009)

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

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.
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 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.
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.

General Information

• Status: Historical
• Publication Date: 31-Mar-2009
• ICS: 29.240.20 - Power transmission and distribution lines
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.07 - Conductors of Light Metals

Relations

• Replaces: ASTM B779-03 - Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Steel-Reinforced (ACSR/TW)
• Effective Date: 01-Apr-2009
• Replaced By: ASTM B779-12 - Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Steel-Reinforced (ACSR/TW)
• Effective Date: 01-Jun-2012
• Referred By: ASTM B1006-17 - Standard Specification for Electrical Overhead Conductor Code Word Names
• Effective Date: 01-Apr-2009

Standards Content (Sample)

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:B779 −03(Reapproved 2009)
Standard Specification for
Shaped Wire Compact Concentric-Lay-Stranded Aluminum
Conductors, Steel-Reinforced (ACSR/TW)
This standard is issued under the fixed designation B779; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Reinforced (ACSR/AZ) (Withdrawn 2007)
B354Terminology Relating to Uninsulated Metallic Electri-
1.1 This specification covers shaped wire compact
cal Conductors
concentric-lay-stranded aluminum conductor, steel-reinforced
B498/B498MSpecification for Zinc-Coated (Galvanized)
(ACSR/TW) and its component wires for use as overhead
Steel Core Wire for Use in Overhead Electrical Conduc-
electrical conductors (Explanatory Note 1 and Note 2).
tors
1.2 Thevaluesstatedininch-poundunitsaretoberegarded
B500/B500MSpecification for Metallic Coated or Alumi-
as standard. The values given in parentheses are mathematical
num Clad Stranded Steel Core for Use in Overhead
conversions to SI units that are provided for information only
Electrical Conductors
and are not considered standard.
B502Specification forAluminum-Clad Steel Core Wire for
Use in Overhead Electrical Aluminum Conductors
NOTE 1—ACSR/TW is designed to increase the aluminum area for a
given diameter of conductor by the use of trapezoidally shaped wires B549Specification for Concentric-Lay-Stranded Aluminum
(TW). The conductors consist of a central core of round steel wire(s)
Conductors, Aluminum-Clad Steel Reinforced for Use in
surrounded by two or more layers of trapezoidal aluminum 1350-H19
Overhead Electrical Conductors
wires. Different strandings of the same size of conductor are identified by
B606Specification for High-Strength Zinc-Coated (Galva-
type, which is the approximate ratio of steel area to aluminum area
nized) Steel Core Wire for Aluminum and Aluminum-
expressedinpercent(Table1,Table2andTable3).Forthepurposeofthis
specification, the sizes listed in Table 1 and Table 2 are tabulated on the
Alloy Conductors, Steel Reinforced
basisofthefinishedconductorhavinganareaoroutsidediameterequalto
B802/B802M Specification for Zinc–5 % Aluminum-
that of specific sizes of standard ACSR so as to facilitate conductor
MischmetalAlloy-Coated Steel Core Wire forAluminum
selection.
Conductors, Steel Reinforced (ACSR)
NOTE 2—The aluminum and temper designations conform to ANSI
Standard H35.1. Aluminum 1350 corresponds to Unified Numbering B803Specification for High-Strength Zinc–5 %Aluminum-
System (UNS) A91350 in accordance with Practice E527.
Mischmetal Alloy-Coated Steel Core Wire for Use in
Overhead Electrical Conductors
2. Referenced Documents
E29Practice for Using Significant Digits in Test Data to
2.1 ASTM Standards: Determine Conformance with Specifications
B230/B230MSpecification for Aluminum 1350–H19 Wire E527Practice for Numbering Metals and Alloys in the
for Electrical Purposes Unified Numbering System (UNS)
B232/B232M Specification for Concentric-Lay-Stranded
Aluminum Conductors, Coated-Steel Reinforced (ACSR)
2.2 Other Documents:
B263Test Method for Determination of Cross-Sectional
ANSIH35.1AmericanNationalStandardAlloyandTemper
Area of Stranded Conductors
Designation Systems for Aluminum
B341/B341MSpecification for Aluminum-Coated (Alumi-
NBS Handbook 100—Copper Wire Tables of the National
nized) Steel Core Wire for Aluminum Conductors, Steel
Bureau of Standards
3. Terminology
This specification is under the jurisdiction of ASTM Committee B01 on
3.1 Definitions of Terms Specific to This Standard:
Electrical Conductors and is the direct responsibility of Subcommittee B01.07 on
Conductors of Light Metals.
Current edition approved April 1, 2009. Published May 2009. Originally
approved in 1987. Last previous edition approved in 2003 as B779–03. DOI: The last approved version of this historical standard is referenced on
10.1520/B0779-03R09. www.astm.org.
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from American National Standards Institute, 11 West 42nd Street,
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM New York, NY 10036.
Standards volume information, refer to the standard’s Document Summary page on AvailablefromNationalTechnicalInformationService,5285PortRoyalRoad,
the ASTM website. Springfield, VA 22161.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B779−03 (2009)
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 and Stranding of ACSR
Mass per
Steel Core Stranding
Number of Rated Nominal
Size with Equal Area
Number of
Unit
Aluminum Strength, Outside
A
Layers
Number of Diameter, Length, B
Wires 1000 lb Diameter, in.
kcmil Type kcmil Stranding
lb/1000 ft
Wires 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 38.9 1.29
1431.0 13 1431.0 54/19 39 3 19 0.0977 1836 49.6 1.34
1590.0 7 1590.0 45/7 36 3 7 0.1253 1792 42.2 1.36
1590.0 13 1590.0 54/19 42 3 19 0.1030 2040 55.1 1.41
1780.0 8 1780.0 84/19 37 3 19 0.0874 2063 50.7 1.45
2156.0 8 2156.0 84/19 64 4 19 0.0961 2515 61.1 1.61
A
Mass per unit length is based on Class A zinc-coated steel.
B
Rated strengths were calculated in accordance with 9.1 using steel stresses at 1 % for Class A coating in accordance with Specification B498/B498M (1 kip = 1000
lbf = 4.448 kN).
3.1.1 ACSR/TWcoveredbythisspecificationhasfivetypes 3.1.9 ACSR/TW/MB—ACSR/TW using Class B zinc-5%
of coated core wire and one type of aluminum-clad core wire aluminum-mischmetal alloy-coated steel core wire (Specifica-
whicharedesignatedbyabbreviationsasfollows(Explanatory tion B802/B802M).
Note 2):
3.1.10 ACSR/TW/MC—ACSR/TW using Class C zinc-5%
3.1.2 ACSR/TW/AW—ACSR/TW using aluminum-clad
aluminum-mischmetal alloy-coated steel core wire (Specifica-
steel wire (Specification B502).
tion B802/B802M).
3.1.3 ACSR/TW/AZ—ACSR/TW using aluminum-coated
3.1.11 ACSR/TW/MS—ACSR/TWusing high-strength zinc-
(aluminized) steel wire (Specification B341/B341M).
5% mischmetal alloy-coated steel core wire (Specification
3.1.4 ACSR/TW/GA—ACSR/TW using ClassAzinc-coated B803).
steel wire (Specification B498/B498M).
4. Ordering Information
3.1.5 ACSR/TW/GB—ACSR/TW using Class B zinc-coated
4.1 Ordersformaterialunderthisspecificationshallinclude
steel wire (Specification B498/B498M).
the following information:
3.1.6 ACSR/TW/GC—ACSR/TWusing Class C zinc-coated
4.1.1 Quantity of each size,
steel wire (Specification B498/B498M
4.1.2 Conductor size: kcmil area and diameter,
3.1.7 ACSR/TW/HS—ACSR/TW using extra high-strength
4.1.3 Conductor type and number of wires, aluminum and
steel wire (Specification B606).
steel (Tables 1-3),
3.1.8 ACSR/TW/MA—ACSR/TW using Class A zinc-5% 4.1.4 Type of steel core wire and if zinc or Zn-5% -MM
aluminum-mischmetal alloy-coated steel core wire (Specifica- alloy coated, Class (A, B, and C) of coating (see 5.2),
tion B802/B802M). 4.1.5 Special tension test, if required (see 9.2),
B779−03 (2009)
TABLE 2 Construction Requirements for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated Steel Reinforced Sized to Have Diameter Equal to
ACSR, Class AA
ACSR/TW Conductor Size and Stranding of ACSR
A
Mass
Code Word Steel Core Stranding
Number of Rated Nominal
Size with Equal Diameter
Number of per Unit
Aluminum Strength, Outside
B
Layers
Length,
Number of Diameter, C D
E E
Wires 1000 lb Diameter, in.
kcmil Type kcmil Stranding
D
lb/1000 ft
Wires in.
Monongahela/TW 405.1 6 336.4 18/1 14 2 1 0.1520 441 10.2 0.68
Mohawk/TW 571.7 13 477.0 24/7 18 2 7 0.1030 735 20.6 0.85
Calumet/TW 565.3 16 477.0 26/7 20 2 7 0.1146 776 22.9 0.86
Mystic/TW 666.6 13 556.5 24/7 20 2 7 0.1111 856 24.0 0.91
Oswego/TW 664.8 16 556.5 26/7 20 2 7 0.1244 913 26.6 0.93
Maumee/TW 768.2 13 636.0 24/7 20 2 7 0.1195 988 27.7 0.98
Wabash/TW 762.8 16 636.0 26/7 20 2 7 0.1331 1047 30.5 0.99
Nechako/TW 768.9 3 636.0 36/1 27 3 1 0.1520 785 16.4 0.93
Kettle/TW 957.2 7 795.0 45/7 32 3 7 0.0973 1079 26.0 1.06
Fraser/TW 946.7 10 795.0 22/7 35 3 7 0.1154 1142 29.6 1.08
Columbia/TW 966.2 13 795.0 54/7 21 2 7 0.1338 1241 34.0 1.09
Suwannee/TW 959.6 16 795.0 26/7 22 2 7 0.1493 1318 37.0 1.11
Cheyenne/TW 1168.1 5 954.0 42/7 30 3 7 0.0926 1260 28.9 1.16
Genesee/TW 1158.0 7 954.0 45/7 33 3 7 0.1078 1308 31.6 1.17
Hudson/TW 1158.4 13 954.0 54/7 25 2 7 0.1467 1489 39.6 1.20
Catawba/TW 1272.0 5 1033.5 42/7 30 3 7 0.0967 1372 31.4 1.20
Nelson/TW 1257.1 7 1033.5 45/7 35 3 7 0.1115 1417 34.2 1.21
Yukon/TW 1233.6 13 1033.5 54/7 38 3 19 0.0910 1586 42.9 1.25
Truckee/TW 1372.5 5 1113.0 42/7 30 3 7 0.1004 1481 33.4 1.25
Mackenzie/TW 1359.7 7 1113.0 45/7 36 3 7 0.1159 1530 36.9 1.26
Thames/TW 1334.6 13 1113.0 54/19 39 3 19 0.0944 1713 46.3 1.29
St. Croix/TW 1467.8 5 1192.5 42/7 33 3 7 0.1041 1585 35.8 1.29
Miramichi/TW 1455.3 7 1192.5 45/7 36 3 7 0.1200 1640 39.2 1.30
Merrimack/TW 1433.6 13 1192.5 54/19 39 3 19 0.0978 1840 49.7 1.34
Platte/TW 1569.0 5 1272.0 42/7 33 3 7 0.1074 1693 38.2 1.33
Potomac/TW 1557.4 7 1272.0 45/7 36 3 7 0.1241 1755 41.9 1.35
Rio Grande/TW 1533.3 13 1272.0 54/19 39 3 19 0.1012 1968 53.2 1.38
Schuylkill/TW 1657.4 7 1351.5 45/7 36 3 7 0.1280 1868 44.0 1.39
Pecos/TW 1622.0 13 1351.5 54/19 39 3 19 0.1064 2107 57.5 1.42
Pee Dee/TW 1758.6 7 1431.0 45/7 37 3 7 0.1319 1982 46.7 1.43
James/TW 1730.6 13 1431.0 54/19 39 3 19 0.1075 2221 59.4 1.47
Athabaska/TW 1949.6 7 1590.0 45/7 42 3 7 0.1392 2199 51.9 1.50
Cumberland/TW 1926.9 13 1590.0 54/19 42 3 19 0.1133 2471 65.3 1.55
Powder/TW 2153.8 8 1780.0 84/19 64 4 19 0.0961 2498 61.1 1.60
Santee/TW 2627.3 8 2156.0 84/19 64 4 19 0.1062 3048 74.5 1.76
A
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.
B
Mass per unit length is based on Class A zinc-coated steel. To convert to kg/km, multiply the lb/1000 ft value x 1.4887.
C
Rated strength was calculated in accordance with 9.1 using steel stresses at 1 % for Class A coating in accordance with Specification B498/B498M (1 kip = 1000 lbf = 4.445 kN).
D
To convert the diameter (inches) to mm, multiply the inch value x 25.4.
E 2 -4
To convert from kcmil to mm area, multiply the kcmil value x 5.067 x 10 .

B779−03 (2009)
TABLE 3 Construction Requirements for Shaped Wire Compact Concentric-Lay Stranded Aluminum Conductors Coated, Steel
Reinforced
ACSR/TW Conductor
Steel Core Stranding
Number of Number Mass per Unit Rated Strength, Nominal Outside
Size
Aluminum Wires of Layers Length, lb/1000 ft 1000 lb Diameter, in.
kcmil Number of Wires Diameter, in.
795.5 17 2 7 0.0866 886.0 21.2 0.95
1109.7 17 2 7 0.0700 1132.0 23.6 1.10
1524.1 33 3 7 0.0966 1617.0 35.8 1.30
1935.4 31 3 7 0.0866 1958.0 41.0 1.45
4.1.6 Place of inspection (Section 15), 7.5 The preferred lay of the 12-wire layer of 19-wire steel
4.1.7 Package size and type (see 16.1), core is 20 times the outside diameter of the core but the lay
4.1.8 Special package markings, if required (Section 16), shall be not less than 16 nor more than 24 times that diameter.
and
7.6 The direction of lay of the outside layer of aluminum
4.1.9 Heavy wood lagging, if required (see 16.3).
wires shall be right-hand.
7.7 The direction of lay of the aluminum and steel wires
5. Requirement for Wires
shall be reversed in successive layers.
5.1 Before stranding, the trapezoidal aluminum wires (see
7.8 For the purpose of this specification the lay factor is the
Terminology B354) shall conform to the requirements of
length of lay of a given layer divided by its outside diameter.
Specification B230/B230M except for shape and diameter
tolerance. The tensile strength and elongation requirements of
8. Construction
trapezoidal wires shall be the same as for round wires of equal
area. The area tolerances shall be such that the finished 8.1 The nominal aluminum cross-sectional area, conductor
conductor conforms to Section 12. type, the nominal number of aluminum wires, the number of
layers,thenumberanddiameterofthesteelcorewire,themass
5.2 Before stranding, the steel core wire shall meet the
per unit length, the rated strength and the outside diameter of
requirements of Specifications B341/B341M, B498/B498M,
the shaped wire compact concentric-lay-stranded aluminum
B502, B606, B802/B802M,or B803, whichever is applicable.
conductors, steel-reinforced, shall be as shown in Tables 1-3.
5.3 Following stranding, the steel core shall meet the
NOTE 3—Exception to 8.1. Because the final design of a shaped wire
requirements of Specification B500/B500M.
compactconductoriscontingentonseveralfactorssuchaslayerdiameter,
wirewidthandthickness,etc.,theactualconfigurationofagivensizemay
6. Joints
vary between manufacturers. This might result in a slight variation in the
numberofwiresfromthatshowninTables1-3,andalsointhedimensions
6.1 Electric-butt welds, electric-butt cold-upset welds, or
of the individual wires (See Table 4).
cold-pressure welds m
...

This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:B 779–96 Designation: B 779 – 03 (Reapproved 2009)
Standard Specification for
Shaped Wire Compact Concentric-Lay-Stranded Aluminum
Conductors, Steel-Reinforced (ACSR/TW)
This standard is issued under the fixed designation B 779; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
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).
1.2The values stated in inch-pound units are to be regarded as the standard with the exception of temperature, density, and
resistivity. The SI equivalents of inch-pound units may be approximate.
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/TWis designed to increase the aluminum area for a given diameter of conductor by the use of trapezoidally shaped wires (TW).The
conductorsconsistofacentralcoreofroundsteelwire(s)surroundedbytwoormorelayersoftrapezoidalaluminum1350-H19wires.Differentstrandings
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.
NOTE 2—The aluminum and temper designations conform to ANSI Standard H35.1. Aluminum 1350 corresponds to Unified Numbering System
(UNS) A91350 in accordance with Practice E527.
2. Referenced Documents
2.1 ASTM Standards:
B230/B230M Specification for Aluminum 1350-H191350H19 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
B341/B341M SpecificationforAluminum-Coated(Aluminized)SteelCoreWireforAluminumConductors,SteelReinforced
(ACSR/AZ)
B354 Terminology Relating to Uninsulated Metallic Electrical Conductors
B498Specification for Zinc-Coated (Galvanized) Steel Core Wire for Aluminum Conductors, Steel Reinforced (ACSR)
498/B498M Specification for Zinc-Coated (Galvanized) Steel Core Wire for Use in Overhead Electrical Conductors
B500Specification for Metallic Coated Stranded Steel Core for Aluminum Conductors, Steel Reinforced (ACSR) 500/
B500M Specification for Metallic Coated Stranded Steel Core for Use in Overhead Electrical Conductors
B502 Specification for Aluminum-Clad Steel Core Wire for Aluminum Conductors, Aluminum-Clad Steel Reinforced
B549 Specification for Concentric-Lay-Stranded Aluminum Conductors, Aluminum-Clad Steel Reinforced (ACSR/AW)
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% Zinc5 % 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 Aluminum and
Aluminum-Alloy Conductors, Steel Reinforced Specification for High-Strength Zinc5 % 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 andAlloys (UNS) Practice for Numbering Metals andAlloys in the Unified Numbering
ThisspecificationisunderthejurisdictionofASTMCommitteeB-1B01onElectricalConductorsandisthedirectresponsibilityofSubcommitteeB01.07onConductors
of Light Metals.
Current edition approved March 10, 1996. Published May 1996. Originally published as B779–87. Last previous edition B779–91.
Current edition approved April 1, 2009. Published May 2009. Originally approved in 1987. Last previous edition approved in 2003 as B779–03.
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,[e-mail] Annual Book of ASTM Standards
, Vol 02.03.volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B 779 – 03 (2009)
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 and Stranding of ACSR
Mass per
Steel Core Stranding
Number of Rated Nominal
Size with Equal Area
Number of Unit
Aluminum Strength, Outside
A
Layers Length,
B
Number of Diameter,
Wires 1000 lb Diameter, in.
kcmil Type kcmil Stranding
lb/1000 ft
Wires 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 38.9 1.29
1431.0 13 1431.0 54/19 39 3 19 0.0977 1836 49.6 1.34
1590.0 7 1590.0 45/7 36 3 7 0.1253 1792 42.2 1.36
1590.0 13 1590.0 54/19 42 3 19 0.1030 2040 55.1 1.41
1780.0 8 1780.0 84/19 37 3 19 0.0874 2063 50.7 1.45
2156.0 8 2156.0 84/19 64 4 19 0.0961 2515 61.1 1.61
A
Mass per unit length is based on Class A zinc-coated steel.
B
Rated strengths were calculated in accordance with 9.1 using steel stresses at 1 % for ClassAcoating in accordance with Specification B 498/B 498M (1 kip = 1000
lbf = 4.448 kN).
System (UNS)
2.2 Other Documents:
ANSI H35.1 American National Standard Alloy and Temper Designation Systems for Aluminum
NBS Handbook 100—Copper Wire Tables of the National Bureau of Standards
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 ACSR/TWcoveredbythisspecificationhasfivetypesofcoatedcorewireandonetypeofaluminum-cladcorewirewhich
are designated by abbreviations as follows (Explanatory Note 2):
3.1.1.1 ACSR/TW/AW—ACSR/TW using aluminum-clad steel wire (Specification B502).
3.1.1.2 ACSR/TW/AZ—ACSR/TW using aluminum-coated (aluminized) steel wire (Specification B341/B341M).
3.1.1.3 ACSR/TW/GA—ACSR/TW using Class A zinc-coated steel wire (Specification B498/B498M).
3.1.1.4 ACSR/TW/GB—ACSR/TW using Class B zinc-coated steel wire (Specification B498/B498M).
3.1.1.5 ACSR/TW/GC—ACSR/TW using Class C zinc-coated steel wire (Specification B498/B498M).
3.1.1.6 ACSR/TW/HS—ACSR/TW using extra high-strength steel wire (Specification B606).
3.1.1.7 ACSR/TW/MA—ACSR/TW using Class A zinc-5% aluminum-mischmetal alloy-coated steel core wire (Specification
B802/B802M).
Annual Book of ASTM Standards, Vol 14.02.
Available from American National Standards Institute, 11 West 42nd Street, New York, NY 10036.
Annual Book of ASTM Standards, Vol 01.01.
Available from National Technical Information Service, 5285 Port Royal Road, Springfield, VA 22161.
B 779 – 03 (2009)
TABLE 2 Construction Requirements for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated Steel Reinforced Sized to Have Diameter Equal to
ACSR, Class AA
ACSR/TW Conductor Size and Stranding of ACSR
A
Mass
Code Word Steel Core Stranding
Number of Rated Nominal
Size with Equal Diameter
Number of per Unit
Aluminum Strength, Outside
AB
Layers Length,
BC D
Number of Diameter,
E E Wires 1000 lb Diameter, in.
kcmil Type kcmil Stranding
D lb/1000 ft
Wires in.
405.1 6 336.4 18/1 14 2 1 0.1520 441 10.2 0.68
Monongahela/TW 405.1 6 336.4 18/1 14 2 1 0.1520 441 10.2 0.68
571.7 13 477.0 24/7 18 2 7 0.1030 735 20.6 0.85
Mohawk/TW 571.7 13 477.0 24/7 18 2 7 0.1030 735 20.6 0.85
565.3 16 477.0 26/7 20 2 7 0.1146 776 22.9 0.86
Calumet/TW 565.3 16 477.0 26/7 20 2 7 0.1146 776 22.9 0.86
666.6 13 556.5 24/7 20 2 7 0.1111 856 24.0 0.91
Mystic/TW 666.6 13 556.5 24/7 20 2 7 0.1111 856 24.0 0.91
664.8 16 556.5 26/7 20 2 7 0.1244 913 26.6 0.93
Oswego/TW 664.8 16 556.5 26/7 20 2 7 0.1244 913 26.6 0.93
768.2 13 636.0 24/7 20 2 7 0.1195 988 27.7 0.98
Maumee/TW 768.2 13 636.0 24/7 20 2 7 0.1195 988 27.7 0.98
762.8 16 636.0 26/7 20 2 7 0.1331 1047 30.5 0.99
Wabash/TW 762.8 16 636.0 26/7 20 2 7 0.1331 1047 30.5 0.99
768.9 3 636.0 36/1 27 3 1 0.1520 785 16.4 0.93
Nechako/TW 768.9 3 636.0 36/1 27 3 1 0.1520 785 16.4 0.93
957.2 7 795.0 45/7 32 3 7 0.0973 1079 26.0 1.06
Kettle/TW 957.2 7 795.0 45/7 32 3 7 0.0973 1079 26.0 1.06
946.7 10 795.0 22/7 35 3 7 0.1154 1142 29.6 1.08
Fraser/TW 946.7 10 795.0 22/7 35 3 7 0.1154 1142 29.6 1.08
966.2 13 795.0 54/7 21 2 7 0.1338 1241 34.0 1.09
Columbia/TW 966.2 13 795.0 54/7 21 2 7 0.1338 1241 34.0 1.09
959.6 16 795.0 26/7 22 2 7 0.1493 1318 37.0 1.11
Suwannee/TW 959.6 16 795.0 26/7 22 2 7 0.1493 1318 37.0 1.11
1168.1 5 954.0 42/7 30 3 7 0.0926 1260 28.9 1.16
Cheyenne/TW 1168.1 5 954.0 42/7 30 3 7 0.0926 1260 28.9 1.16
1158.0 7 954.0 45/7 33 3 7 0.1078 1308 31.6 1.17
Genesee/TW 1158.0 7 954.0 45/7 33 3 7 0.1078 1308 31.6 1.17
1158.4 13 954.0 54/7 25 2 7 0.1467 1489 39.6 1.20
Hudson/TW 1158.4 13 954.0 54/7 25 2 7 0.1467 1489 39.6 1.20
1272.0 5 1033.5 42/7 30 3 7 0.0967 1372 31.4 1.20
Catawba/TW 1272.0 5 1033.5 42/7 30 3 7 0.0967 1372 31.4 1.20
1257.1 7 1033.5 45/7 35 3 7 0.1115 1417 34.2 1.21
Nelson/TW 1257.1 7 1033.5 45/7 35 3 7 0.1115 1417 34.2 1.21
1233.6 13 1033.5 54/7 38 3 19 0.0910 1586 42.9 1.25
Yukon/TW 1233.6 13 1033.5 54/7 38 3 19 0.0910 1586 42.9 1.25
1372.5 5 1113.0 42/7 30 3 7 0.1004 1481 33.4 1.25
Truckee/TW 1372.5 5 1113.0 42/7 30 3 7 0.1004 1481 33.4 1.25
1359.7 7 1113.0 45/7 36 3 7 0.1159 1530 36.9 1.26
Mackenzie/TW 1359.7 7 1113.0 45/7 36 3 7 0.1159 1530 36.9 1.26
1334.6 13 1113.0 54/19 39 3 19 0.0944 1713 46.3 1.29
Thames/TW 1334.6 13 1113.0 54/19 39 3 19 0.0944 1713 46.3 1.29
1467.8 5 1192.5 42/7 33 3 7 0.1041 1585 35.8 1.29
St. Croix/TW 1467.8 5 1192.5 42/7 33 3 7 0.1041 1585 35.8 1.29
1455.3 7 1192.5 45/7 36 3 7 0.1200 1640 39.2 1.30
Miramichi/TW 1455.3 7 1192.5 45/7 36 3 7 0.1200 1640 39.2 1.30
1433.6 13 1192.5 54/19 39 3 19 0.0978 1840 49.7 1.34
Merrimack/TW 1433.6 13 1192.5 54/19 39 3 19 0.0978 1840 49.7 1.34
1569.0 5 1272.0 42/7 33 3 7 0.1074 1693 38.2 1.33
Platte/TW 1569.0 5 1272.0 42/7 33 3 7 0.1074 1693 38.2 1.33
1557.4 7 1272.0 45/7 36 3 7 0.1241 1755 41.9 1.35
Potomac/TW 1557.4 7 1272.0 45/7 36 3 7 0.1241 1755 41.9 1.35
1533.3 13 1272.0 54/19 39 3 19 0.1012 1968 53.2 1.38
Rio Grande/TW 1533.3 13 1272.0 54/19 39 3 19 0.1012 1968 53.2 1.38
1657.4 7 1351.5 45/7 36 3 7 0.1280 1868 44.0 1.39
Schuylkill/TW 1657.4 7 1351.5 45/7 36 3 7 0.1280 1868 44.0 1.39
1622.0 13 1351.5 54/19 39 3 19 0.1064 2107 57.5 1.42
Pecos/TW 1622.0 13 1351.5 54/19 39 3 19 0.1064 2107 57.5 1.42
1758 6 7 1431 0 45/7 37 3 7 0 1319 1982 46 7 1 43

B 779 – 03 (2009)
TABLE 3 Construction Requirements for Shaped Wire Compact Concentric-Lay Stranded Aluminum Conductors Coated, Steel
Reinforced
ACSR/TW Conductor
Steel Core Stranding
Number of Number Mass per Unit Rated Strength, Nominal Outside
Size
Aluminum Wires of Layers Length, lb/1000 ft 1000 lb Diameter, in.
kcmil Number of Wires Diameter, in.
795.5 17 2 7 0.0866 886.0 21.2 0.95
1109.7 17 2 7 0.0700 1132.0 23.6 1.10
1524.1 33 3 7 0.0966 1617.0 35.8 1.30
1935.4 31 3 7 0.0866 1958.0 41.0 1.45
3.1.1.8 ACSR/TW/MB—ACSR/TW using Class B zinc-5% aluminum-mischmetal alloy-coated steel core wire (Specification
B802/B802M).
3.1.1.9 ACSR/TW/MC—ACSR/TW using Class C zinc-5% aluminum-mischmetal alloy-coated steel core wire (Specification
B802/B802M).
3.1.1.10 ACSR/TW/MS—ACSR/TW using high-strength zinc-5% mischmetal alloy-coated steel core wire (Specification
B803).
4. Ordering Information
4.1 Orders for material under this specification shall include the following information:
4.1.1 Quantity of each size,
4.1.2 Conductor size: kcmil area and diameter,
4.1.3 Conductor type and number of wires, aluminum and steel (Tables 1-3),
4.1.4 Type of steel core wire and if zinc or Zn-5% -MM alloy coated, Class (A, B, and C) of coating (see 5.2),
4.1.5 Special tension test, if required (see 9.2),
4.1.6 Place of inspection (Section 15),
4.1.7 Package size and type (see 16.1),
4.1.8 Special package markings, if required (Section 16), and
4.1.9 Heavy wood lagging, if required (see 16.3).
5. Requirement for Wires
5.1 Before stranding, the trapezoidal aluminum wires (see Terminology B354) shall conform to the requirements of
Specification B230/B230M except for shape and diameter tolerance. The tensile strength and elongation requirements of
trapezoidal wires shall be the same as for round wires of equal area. The area tolerances shall be such that the finished conductor
conforms to Section 12.
5.2 Before stranding, the steel core wire shall meet the requirements of Specifications B341, B498, B502, B606, B802, or
B803Before
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