ASTM B354-98
(Terminology)Standard Terminology Relating to Uninsulated Metallic Electrical Conductors
Standard Terminology Relating to Uninsulated Metallic Electrical Conductors
SCOPE
1.1 This terminology standard defines abbreviations and terms specific to uninsulated electrical conductors. For terms relating to superconductors, see Definitions B713.
General Information
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Designation:B 354–98
Standard Terminology Relating to
Uninsulated Metallic Electrical Conductors
This standard is issued under the fixed designation B 354; 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 (e) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
These terminologies relate only to interpretations as applied to uninsulated metallic electrical
conductors in specifications under the jurisdiction of ASTM Committee B-1 on Wires for Electrical
Conductors, and do not necessarily correspond to the definitions used in other fields.
1. Scope TW—trapezoidal shaped wire.
Zn-5Al-MM—zinc-5% aluminum-mischmetal alloy coat-
1.1 This terminology standard defines abbreviations and
ing.
terms specific to uninsulated electrical conductors. For terms
relating to superconductors, see Terminology B713.
4. Terminology
2. Referenced Documents 4.1 Definitions:
2.1 ASTM Standards:
aeolian vibration—resonant vibration of a conductor caused
B713 Terminology Relating to Superconductors
by the alternate shedding of wind-induced vortices from
opposite sides of the conductor. (Frequency is usually less
3. Abbreviations AAC—aluminum conductor.
than 200 Hz and amplitude rarely exceeds one conductor
AACSR—aluminum alloy conductor, steel reinforced.
diameter.)
ACAR—aluminum conductor, aluminum alloy reinforced.
annealed wire—see soft wire.
ACSR—aluminum conductor, steel reinforced.
area density—mass per unit area.
AW—aluminum clad steel wire.
bare conductor—a conductor having no nonmetallic cover-
AZ—aluminum coated (aluminized) steel wire.
ing.
COMP—compact construction.
brazing—the joining of ends of two wires, rods, or groups of
GA—zinc coated (galvanized) steel wire, coating class A.
wires with a nonferrous filler metal at temperatures above
GB—zinc coated (galvanized) steel wire, coating class B.
800°F [427°C].
GC—zinc coated (galvanized) steel wire, coating class C.
breaking strength—the maximum load that a conductor
HS—zinc coated (galvanized) high strength steel wire.
attains when tested in tension to rupture.
MA—zinc-5% aluminum-mischmetal alloy coated steel
bunch-stranded conductor—a conductor composed of wires
wire, coating class A.
twisted together with a given length and direction of lay in
MB—zinc-5% aluminum-mischmetal alloy coated steel
such manner that the respective wires at successive cross
wire, coating class B.
sections along the length of the conductor do not necessarily
MC—zinc-5% aluminum-mischmetal alloy coated steel
form a symmetrical geometric pattern, nor necessarily oc-
wire, coating class C.
cupy the same positions relative to each other.
MS—zinc-5 % aluminum-mischmetal alloy coated high
circular mil (cmil)—a unit of area equal to the area of a circle
strength steel wire.
one mil (0.001 in., 0.0254 mm) in diameter. The area of a
SD—self dampening construction.
circle in circular mils is equal to the square of the diameter
SIW—single input wire construction.
in mils [area(cmils) = diameter(mils) ], 1 cmil = 7.854 3 10
2 −10 2
−7 in. [5.067 3 10 m ].
clad wire—wire comprised of a given metal covered with a
This terminology is under the jurisdiction of ASTM Committee B-1 on
relatively thick application of a different metal.
Electrical Conductors and is the direct responsibility of Subcommittee B01.01 on
Editorial and Records. coated wire—wire comprised of a given metal covered with a
Current edition approved Sept. 10, 1998. Published November 1998. Originally
relatively thin application of a different metal.
published as B354–60T. Last previous edition B354–93.
Annual Book of ASTM Standards, Vol 02.03.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B354–98
cold-drawing—reducing the cross section by pulling through one or more layers of wires or members are laid helically to
adieordies,atatemperaturelowerthantherecrystallization form a concentric-lay.
temperature. continuous cast drawing stock—the as-rolled section, nor-
combination stranded conductor—a conductor constructed mally round, produced by a continuous casting and rolling
with wires of different diameters with such differences process.
occurring either within a single layer or from layer to layer. core—see conductor core.
compact stranded conductor—a unidirectional or unilay or cored, annular, conductor—a conductor in which one or
conventional concentric conductor, constructed with a cen- more layers of wires are laid helically around a central core
tral core surrounded by one or more layers of helically laid of metallic or nonmetallic material. The core is used as a
wires and formed into final shape by rolling, drawing, or mandrel for the application of subsequent layers of wire to
other means; and manufactured to a specified nominal maintain consistent spacing of these members around the
diameter, approximately 8 to 10% below the nominal conductor axis.
diameter of a conventional noncompact conductor of the direction of lay—the lateral direction, designated as left-hand
same cross-sectional area. or right-hand, in which the wires of a member or units of a
compressed stranded conductor—a unidirectional or unilay conductor run over the top of the member or conductor as
or conventional concentric conductor manufactured to a they recede from an observer looking along the axis of the
specified nominal diameter 3% less than the calculated member or conductor.
diameter of noncompressed conductor of the same construc- drawing stock—the as-rolled or extruded section, normally
tion and cross-sectional area. round, made from any of a variety of manufacturing pro-
composite conductor—a conductor consisting of two or more cesses, intended as feed stock for subsequent drawing
types of wire, each type of wire being plain, clad, or coated; operations.
stranded together to operate mechanically and electrically as electric-butt, cold-upset weld—a weld between two prepared
a single conductor. ends of adjacent lengths of work-hardenable material that is
concentric-lay conductor—conductorconstructedwithacen- pressed together in a resistance welding apparatus which
tral core surrounded by one or more layers of helically laid melts the abutting ends to unite them and form the weld. In
wires. Several types are as follows: turn,theresultingweldzoneisforcedoutintheformofflash
compact round conductor—see compact stranded conduc- by a cold-upsetting operation which, through cold-working,
tor. restores the material substantially to its original tensile
conventional concentric conductor—conductor constructed strength.
with a round central core surrounded by one or more layers equilay conductor—see concentric-lay conductor.
of helically laid roundwires.Thedirectionoflayisreversed fill factor—the ratio of the weight of a given length of a
insuccessivelayers,andgenerallywithanincreaseinlength stranded conductor to the weight of the solid conductor of
of lay for successive layers. the same diameter, length, and material. It may also be
equilay conductor—conductor constructed with a central expressed by the ratio of the nominal area of the conductor
core surrounded by more than one layer of helically laid times (1 plus the stranding factor) and the area of the circle
wires, all layers having a common length of lay, direction of that encloses the strands of the conductor.
lay being reversed in successive layers. galvanized steel wire—steel wire coated with zinc.
parallel core conductor—conductor constructed with a cen- half-hard wire—as applied to aluminum, wire that has been
tral core of parallel-laid wires surrounded by one layer of processedsoastoproduceastrengthapproximatelymidway
helically laid wires. between that of soft wire and that of hard-drawn wire.
rope-lay conductor—conductor constructed of a bunch- hard-drawn wire—as applied to aluminum and copper, wire
stranded or a concentric-stranded member or members, as a that has been cold drawn to final size so as to approach the
centralcore,aroun
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