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 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 lb^B	Nominal Outside Diameter, in.
kcmil	Type	kcmil	Stranding	Number of Aluminum Wires	Number of Layers	Number of Wires	Diameter, in.	Mass per Unit Length,^A lb/1000 ft	Rated Strength, 1000 lb^B	Nominal Outside 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	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. Keywords ICS Code ICS Number Code 29.240.20 (Power transmission and distribution lines) DOI: 10.1520/B0779-12 ASTM International is a member of CrossRef. ASTM B779 (Electrical Standards and Magnetic Conductor Standards) Citing ASTM Standards [Back to Top]

ASTM B779 - 12

ASTM B779 - 12 Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Steel-Reinforced (ACSR/TW)

ASTM B779 (Electrical Standards and Magnetic Conductor Standards)