Designation:B173–01a
Standard Specification for
Rope-Lay-Stranded Copper Conductors Having Concentric-Stranded Members,for Electrical Conductors1
This standard is issued under thefixed designation B173;the number immediately following the designation indicates the year of original adoption or,in the ca of revision,the year of last revision.A number in parenthes indicates the year of last reapproval.A superscript epsilon(e)indicates an editorial change since the last revision or reapproval.
1.Scope
1.1This specification covers bare rope-lay-stranded con-ductors having concentric-stranded members made from round copper wires,either uncoated or coated with tin,lead,or lead-alloy for u as electrical conductors(Explanatory Note1 and Note2).
1.2Coated wires shall include only tho wires withfin-ished diameters and densities substantially equal to the respec-tive diameters and densities of uncoated wires.
1.3The values stated in inch-pound or SI units are to be regarded parately as standard.Each system shall be ud independently of the other.Combining values from the two systems may result in nonconformance with the specification. For conductor sizes designated by AWG or kcmil,the require-ments in SI units have been numerically converted from corresponding values,stated or derived,in inch-pound units. For conductor sizes designated by SI units only,the require-ments are stated or derived in SI units.
1.3.1For density,resistivity,and temperature,the values stated in SI units are to be regarded as standard.
2.Referenced Documents
2.1The following documents of the issue in effect at the time of reference form a part of this specification to the extent referenced herein:
2.2ASTM Standards:
B3Specification for Soft or Annealed Copper Wire2
B8Specification for Concentric-Lay-Stranded Copper Conductors,Hard,Medium-Hard,or Soft2
B33Specification for Tinned Soft or Annealed Copper Wire for Electrical Purpos2
B172Specification for Rope-Lay-Stranded Copper Con-ductors Having Bunch-Stranded Members,for Electrical Conductors2
B189Specification for Lead-Coated and Lead-Alloy-
Coated Soft Copper Wire for Electrical Purpos2
B263Test Method for Determination of Cross-Sectional Area of Stranded Conductors2
B354Terminology Relating to Uninsulated Metallic Elec-trical Conductors2
2.3American National Standard:
ANSI C42.35Definitions of Electrical Terms3
3.Classification
3.1For the purpo of this specification rope-lay-stranded conductors having concentric-stranded members are classified as follows:
3.1.1Class G—Conductors consisting of7to61rope-lay-stranded members,each of which consists of7to19 concentric-stranded wires,with total conductor sizes ranging from No.14AWG(2.08mm2)to5000000cmil(2534mm2). (Typical u is for rubber-sheathed conductor,apparatus con-ductor,portable conductor,and similar applications.)
3.1.2Class H—Conductors consisting of19to91rope-lay-stranded members,each of which consists of7to19 concentric-stranded wires,with total conductor sizes ranging from No.9AWG(6.63mm2)to5000000cmil(2534mm2). Class K construction produces a conductor with greaterflex-ibility than class G.(Typical u is for rubber-sheathed cord and applications whereflexibility is required such as on take-up reels over sheaves and extra-flexible apparatus con-ductor.)
4.Ordering Information
4.1Orders for material under this specification shall include the following information:
4.1.1Quantity of each size and class;
4.1.2Conductor size:circular-mil area or AWG(Section7);
4.1.3Class(Section3and Table1);
4.1.4Whether coated or uncoated;if coated,designate type of coating(e11.1);
4.1.5Details of special-purpo lays,if required(e6.2 and6.3)and(Explanatory Note3);
4.1.6Package size(e14.1);
1This specification is under the jurisdiction of ASTM Committee B01on Electrical Conductors and is the direct responsibility of Subcommittee B01.04on Conductors of Copper and Copper Alloys.
Current edition approved Oct.10,2001.Published November2001.Originally
issued1942to replace portions of B158–41T.Last previous edition B173–01.
2Annual Book of ASTM Standards,V ol02.03.
3Available from American National Standards Institute,11West42nd St.,13th Floor,New York,NY10036.
1
Copyright©ASTM International,100Barr Harbor Drive,PO Box C700,West Conshohocken,PA19428-2959,United States.
4.1.7Special package marking,if required (Section 15);4.1.8Lagging,if required (e 14.2);and 4.1.9Place of inspection (Section 13).
5.Joints
5.1Necessary joints in wires or in groups of wires shall be made in accordance with accepted commerical practice,taking into account the size of the wire or group of wires as related to the size of the entire conductor.
5.2Concentric-stranded members forming the completed conductor may be joined as a unit by soldering,brazing,or welding.
5.3Joints shall be so constructed and so dispod through-out the conductor that the diameter or configuration of the completed conductor is not substantially affected,and so that the flexibility of the completed conductor is not adverly affected.
TABLE 1Construction Requirements of Rope-Lay Stranded Copper Conductors Having Concentric-Stranded Members A
Area of Cross Section
Size AWG Class G
Class H
Number of
Wires
Diameter of Wires Number of Wires in Each Member Completed Conductor B Number of Wires
Diameter of Wires Number of Wires in Each
Member Completed Conductor B
Nominal Diameter Nominal Mass Nominal Diameter Nominal Mass cmil mm
in.
lb/
1000ft
kg/km
< in.mm lb/
1000ft kg/km
5000000
<11590.0657 1.6719 2.95775.116052238881729
0.0538 1.3719 2.11590.0623 1.5819 2.80471.214433214791
7290.0510 1.3019 2.11590.0587 1.4919 2.64267.1128141906917290.0481 1.2219 2.11590.0550 1.4019 2.47562.9112491674117290.0450 1.1419 2.11590.0509 1.2919 2.29158.296351433817290.0417 1.0619 2.7030.0596 1.5119 2.08653.080121192411590.0464 1.1819 2.7030.0533 1.3519 1.86647.46408953611590.0415 1.0519 1.7030.0520 1.3219 1.82046.26099907711590.0405 1.0319 1.7030.0506 1.2919 1.77145.05775859411590.0394 1.0019 1.7030.0499 1.2719 1.74744.45617835811590.03890.9919 1.7030.0492 1.2519 1.72243.75460812511590.03830.9719 1.7030.0477 1.2119 1.67042.45132763811590.03720.9419 1.4270.0593 1.517 1.60140.7477271027030.0462 1.1719 1.4270.0573 1.467 1.54739.3445666317030.0446 1.1319 1.4270.0552 1.407 1.49037.8413561547030.0430 1.0919 1.4270.0541 1.377 1.46137.1397259117030.0422 1.0719 1.4270.0530 1.357 1.43136.3381256737030.0413 1.0519 1.4270.0508 1.297 1.3723
4.8350252127030.0396 1.0119 1.4270.0484 1.237 1.30733.2317947317030.03770.9619 1.4270.0459 1.177 1.23931.5285942557030.03580.9119 1.4270.0433 1.107 1.16929.7254437877030.03370.8619 1.4270.0419 1.067 1.13128.7238335467030.03270.8319 1.4270.0405 1.037 1.09427.8222633137030.03160.8019 1.4270.03900.997 1.05326.7206430727030.03040.7719 1.4270.03750.957 1.01325.7190828407030.02920.7419 1.4270.03590.9170.96924.6174926037030.02800.71190.2590.0439 1.1270.92223.4157923504270.03420.8770.2590.0417 1.0670.87622.3142521204270.03250.8370.2590.0393 1.0070.82521.0126518834270.03060.7870.2590.03680.9370.77319.6110916514270.02860.7370.2590.03400.8670.71418.194714094270.02650.6770.2590.03110.7970.65316.679211794270.02420.6170.65316.6795118321160010700001330.0399 1.0170.59915.26679922590.02860.7370.60115.367099716780085.00001330.03550.9070.53313.55287852590.02550.6570.53613.653379313310067.4001330.03160.8070.47412.0418*******.02270.5870.47712.142262810560053.501330.02820.7270.42310.73334952590.02020.5170.42410.83344978369042.411330.02510.6470.3779.582643932590.01800.4670.3789.602653956636033.62490.03680.9370.3318.412073082590.01600.4170.3358.512103125262026.73490.03280.8370.2957.491642451330.01990.5170.2997.591662474174021.14490.02920.7470.263 6.681301941330.01770.4570.266 6.761311953309016.85490.02600.6670.234 5.941031541330.01580.4070.237 6.021051562624013.36490.02310.5970.208 5.2881.51211330.01400.3670.210 5.3382.11222082010.57490.02060.5270.185 4.7064.896.51330.01250.3270.188 4.7865.497.4165108.378490.01840.4770.166 4.2251.777.0133
0.01110.2870.167 4.2451.676.813090 6.639490.01630.4170.148 3.7640.660.41330.0099
0.25
7
0.149
3.78
41.061.1
10380 5.2610490.01460.3770.131 3.3332.648.56530 3.3112490.01150.2970.104 2.6420.230.14110
2.0814
49
0.0092
0.23
7
0.083
2.11
12.919.2
A
The constructions shown in this table are typical of tho ud in the industry.It is not intended that this table preclude other constructions that may be desirable for
specific applications.The constructions shown provide for a finished,non-covered,stranded conductor approximately of the area indicated.When specified by the purchar,the number or size of wires may be incread to provide additional area to compensate for draw-down during subquent processing.B
Values for the nominal diameter and mass of the completed conductor are approximate.The mass values are bad upon the standard stranding increments listed in Explanatory Note
6.
6.Lay(Explanatory Note3)
6.1Conductors of the same size and description furnished on one order shall have the same lay.
6.2The length of lay of the outer layer of the rope-lay stranded conductor shall be not less than8nor more than16 times the outside diameter of the completed conductor.The length of lay of the other layers shall be at the option of the manufacturer unless specifically agreed upon.The direction of lay of the outer layer shall be left-hand,unless the direction of lay is specified otherwi by the purchar.The direction of lay of the other layers shall be reverd in successive layers,unless otherwi agreed upon between the manufacturer and the purchar.
6.3The length of lay of the individual wires composing the stranded members shall be not less than8nor more than16 times the outside diameter of that layer.Unless otherwi specified,the directi
on of lay of the outer layer of wires shall be at the option of the manufacturer.The direction of lay shall be reverd in successive layers,unless otherwi agreed upon between the manufacturer and the purchar.
7.Construction
7.1The area of cross ction and the number and diameter of wires for a variety of strand constructions in general u are shown in Table1.
8.Physical and Electrical Tests
8.1Tests for the electrical properties of wires composing conductors made from soft or annealed copper wire,bare or coated,shall be made before stranding.
8.2Tests for the physical properties of soft or annealed copper wire,bare or coated,may be made upon the wires before stranding or upon wires removed from the completed stranded conductors,but need not be made upon both.Care shall be taken to avoid mechanical injury and stretching when removing wires from the conductor for the purpo of testing.
8.3The physical properties of wire when tested before stranding shall conform to the applicable requi
rements of11.1.
8.4The physical properties of wires removed from the completed stranded conductor shall be permitted to vary from the applicable requirements of11.1by the following amounts: (Explanatory Note4):
8.4.1Average of Results Obtained on All Wires Tested—The percent minimum elongation may be reduced by the value of 5%from the values required for unstranded wires as specified by Specifications B3,B33,or B189,as applicable.For example,where the unstranded wire specification requires minimum elongation of30%,wire of that material removed from Specification B173stranded conductor shall meet a minimum elongation value of25%,a value5%reduction.
8.4.2Results Obtained on Individual Wires—The percent minimum elongation may be reduced by the value of15% from the values required for unstranded wires as specified by Specifications B3,B33,or B189,as applicable.For example, where the unstranded wire specification requires minimum elongation of30%,wire of that material removed from Specification B173stranded conductor shall meet a minimum elongation value of15%.If the reduction results in minimum elongation of less than5%,a minimum of5%shall apply.
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8.5In the event that the requirements prescribed in8.4.2are met,but tho prescribed in8.4.1are not met,a retest shall be permitted wherein all wires of a conductor of100wires or less, or100wires lected at random throughout a conductor of more than100wires shall be tested for the purpo offinal determination for conformance to8.4.
8.6Elongation tests to determine compliance shall not be made on the conductor as a unit.
8.7If a tinning,lead-coating,or lead-alloy-coating test is required,it shall be made on the wires prior to stranding. 9.Density
9.1For the purpo of calculating mass,cross ctions,etc., the density of copper shall be taken as8.89g/cm3(0.32117 lb/in.3)at20°C(Explanatory Note5).
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10.Mass and Resistance
10.1The mass and electrical resistance of a unit length of stranded conductor are a function of the length of lay.The approximate mass and electrical resistance may be determined using the standard increments shown in Explanatory Note6. When greater accuracy is desired,the increment bad on the specific lay of the conductor may be calculated(Explanatory Note7).
11.Requirements for Wires
11.1The purchar shall designate the type of wire and type of coating,if any,to be ud in the conductor.
11.1.1Before stranding,uncoated wire shall meet the re-quirements of Specification B3.
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11.1.2Before stranding,tinned wire shall meet the require-ments of Specification B33.
11.1.3Before stranding,lead coated and lead-alloy coated wire shall meet the requirements of Specification B189. 11.2The requirements shall not prohibit the manufacture of conductors from uncoated hard-drawn wires which are annealed after stranding.
三年级语文阅读12.Variation in Area
12.1The calculated area of cross ction of a stranded conductor expresd in circular mils shall be the product of the square of the specified diameter in mils of the individual wires times the number of wires prescribed(Note1).
N OTE1—The calculated area of such cables as may incorporate more than one size of component wires should be the sum of the areas of the different sizes of wires.
12.2The area of cross ction of a completed stranded conductor designated as an AWG size shall be not less than 98%of the area indicated in Column1of Table1for sizes 211600cmil(107mm2)and smaller.The area of cross ction of a completed stranded conductor not designated as an AWG size shall be not less than98%of a calculated value obtained as prescribed in10.1
12.3The area of cross ction of a conductor shall be determined by Test Method B263.In applying this method,the increment of linear density resulting from stranding may be the applicable value listed in Explanatory Note6or may be calculated from the measured component dimensions of
the
sample under test.In ca of question regarding area compli-ance,the actual linear density increment due to stranding shall be calculated
13.Inspection
13.1All tests and inspection shall be made at the place of manufacture unless otherwi especially agreed upon between the manufacturer and the purchar at the time of purcha.The manufacturer shall afford the inspector reprenting the pur-char all reasonable facilities,without charge,to satisfy him that the material is being furnished in accordance with this specification.
14.Packaging and Package Marking
14.1Package sizes for conductors shall be agreed upon between the manufacturer and the purchar in the placing of individual orders.
14.2The conductors shall be protected against damage in ordinary handling and shipping.If heavy wood lagging is required,it shall be specified by the purchar at the time of purcha.
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15.Marking
15.1The net mass,length(or lengths,if more than one length is included in the package),size,kind of conductor, purcha order number,and any other marks required by the purcha order shall be marked on a tag attached to the end of the conductor inside of the package.The same information, together with the manufacturer’s rial number(if any)and all shipping marks required by the purchar,shall appear on the outside of each package.
16.Keywords
16.1copper electrical conductor;electrical conductor—copper;rope-lay-stranded copper conductors;stranded copper conductor
EXPLANATORY NOTES N OTE1—In this specification only rope-lay-stranded conductors con-
structed with concentric-stranded members are designated.Requirements
for rope-lay-stranded conductors constructed with bunch-stranded mem-
bers will be found in Specification B172.Requirements for concentric-
lay-stranded conductors will be found in Specification B8.
N OTE2—For definitions of terms relating to conductors,reference
should be made to ANSI C42.35and Terminology B354.
N OTE3—Certain types of insulated conductors may require a shorter
lay than other conductors.It is expected that departures from the
provisions of this specification becau of special requirements relative to
length of lay,direction of lay,and direction of lay of successive layers will
be agreed upon by the manufacturer and the purchar.
N OTE4—Wires removed from stranded conductors and straightened for
tests will have altered physical properties due to cold working of the
material.The reduced elongation requirement for wires removed from
stranded conductors reflects this condition.
N OTE5—The value of density of copper is in accordance with the
International Annealed Copper Standard.The corresponding value at0°C
is8.90g/cm3(0.32150lb/in.3).Density calculations involving coated
wire should consider the variation of coated wire density from the density
of uncoated copper wire.The relative affect of the coating density on the
overall wire density becomes greater as wire diameters decrea.
N OTE6—The following values approximate the incremental increa in
mass and the incremental decrea in resistance of rope-lay stranded
conductor as a result of stranding.The values are sufficiently accurate for
most purpos and may be ud when more preci values are not
available.They are as follows:
Construction
Increment of
Linear Density
and Resistance,%
Rope-lay-stranded conductors
(Class G and H):
49wires or less3
133wires4
259wires 4.5
427wires5
Over427wires6
N OTE7—Any calculation of the increment of mass or electrical
草字草书resistance,k,of a rope-lay-stranded conductor involves two independent
calculations:
(1)Determination of the increment due to stranding of the individual
members,and
忝为(2)Determination of the increment due to twisting the members to
form the completed conductor.
In the ca of a rope-lay-stranded conductor having concentric-stranded
members,the increment k,in percent,may be expresd as:
k5k m1k a1k m k a/100
where:
k
m
=is the increment of mass or electrical resistance,in percent,of
an individual concentric-stranded member before twisting into
妈妈被偷奸the completed conductor,calculated as described in Specifica-
tion B8,Note9
k
a
=is the increment of mass or electrical resistance,in percent,due
to twisting the concentric-stranded members into the com-
pleted conductor,calculated as described in Specification B8,
Note9,with each member considered as an individual
wire.
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