Name: ASTM B 779 : 2012
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Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Steel-Reinforced (ACSR/TW)

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11-11-2014

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ASTM B 779 : 2014

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English

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01-06-2012

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American Society for Testing and Materials

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Committee	B 01
DocumentType	Standard
Pages	6
PublisherName	American Society for Testing and Materials
Status	Superseded
SupersededBy	ASTM B 779 : 2014
Supersedes	ASTM B 779 : 2003 : R2009

1.1This 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 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	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).

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

Code Word^A	ACSR/TW Conductor Size		Size and Stranding of ACSR with Equal Diameter		Number of Aluminum Wires	Number of Layers	Steel Core Stranding		Mass per Unit Length,^B lb/1000 ft	Rated Strength, 1000 lb^C	Nominal Outside Diameter, in.^D
	kcmil^E	Type	kcmil^E	Stranding	Number of Aluminum Wires	Number of Layers	Number of Wires	Diameter, in.^D	Mass per Unit Length,^B lb/1000 ft	Rated Strength, 1000 lb^C	Nominal Outside Diameter, in.^D
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

^ACode 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).

^DTo convert the diameter (inches) to mm, multiply the inch value x 25.4.

^ETo convert from kcmil to mm² area, multiply the kcmil value x 5.067 x 10^-4.

TABLE 3 Construction Requirements for Shaped Wire Compact Concentric-Lay Stranded Aluminum Conductors Coated, Steel Reinforced

ACSR/TW Conductor Size	Number of Aluminum Wires	Number of Layers	Steel Core Stranding		Mass per Unit Length, lb/1000 ft	Rated Strength, 1000 lb	Nominal Outside Diameter, in.
kcmil	Number of Aluminum Wires	Number of Layers	Number of Wires	Diameter, in.	Mass per Unit Length, lb/1000 ft	Rated Strength, 1000 lb	Nominal Outside 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

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 E527.

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ASTM B 779 : 2012

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

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