Norm

ASTM B857 - 11e2 en

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

50,60 61,23 Incl BTW

Over deze norm

Status Definitief
Aantal pagina's 8
Gepubliceerd op 01-04-2011
Taal Engels

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 SupportedA
Note 1Sized 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

ASTM B857 - 11 en
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