ASTM B857 - 11e1 Standard Specification for Shaped Wire Compact Concentric Lay Stranded Aluminum Conductors, Coated Steel Supported (ACSS/TW)

1. Scope

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

1.2 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.

1.2.1 Exceptions—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.

1.3 ACSS/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 Supported^A

Note 1—Sized to have area equal aluminum cross-sectional area to an ACSR or ACSS, Class AA conductor.

ACSS/TW Conductor Size		Code Word^B	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
kcmil^C	Type	Code Word^B	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	2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard. ASTM Standards 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 B609/B609M Specification for Aluminum 1350 Round Wire, Annealed and Intermediate Tempers, for Electrical Purposes 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 B856 Specification for Concentric-Lay-Stranded Aluminum Conductors, Coated Steel Supported (ACSS) B957 Specification for Extra-High-Strength and Ultra-High-Strength Zinc-Coated (Galvanized) Steel Core Wire for Overhead Electrical Conductors B958 Specification for Extra-High-Strength and Ultra-High-Strength Class A 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 Standards Aluminum Association Code Words for Overhead Aluminum Electrical Conductors Available from Aluminum Association, Inc., 1525 Wilson Blvd., Suite 600, Arlington, VA 22209, http://www.aluminum.org. NBS Handbook 100--Copper Wire Tables of the National Bureau of Standards Available from National Technical Information Service (NTIS), 5301 Shawnee Rd., Alexandria, VA 22312, http://www.ntis.gov. Keywords aluminum conductors; concentric-lay stranded aluminum conductors; electrical conductors; electrical conductors, aluminum; steel-reinforced conductors; steel-supported aluminum conductors; stranded aluminum conductors ; ICS Code ICS Number Code 29.060.10 (Wires) DOI: 10.1520/B0857-11E01 ASTM International is a member of CrossRef. Citing ASTM Standards [Back to Top]

ASTM B857-11e1

Historical Standard: ASTM B857-11e1 Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated-Steel Supported (ACSS/TW)