1、Designation: B 172 01a (Reapproved 2007)e1Standard Specification forRope-Lay-Stranded Copper Conductors Having Bunch-Stranded Members, for Electrical Conductors1This standard is issued under the fixed designation B 172; the number immediately following the designation indicates the year oforiginal a
2、doption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense
3、.e1NOTETable 1 was editorially corrected in March 2007.1. Scope1.1 This specification covers bare rope-lay-stranded con-ductors having bunch-stranded members made from roundcopper wires, either uncoated or coated with tin, lead, orlead-alloy for use as electrical conductors (Explanatory Notes1 and 2
4、).1.2 Coated wires shall include only those wires with fin-ished diameters and densities substantially equal to the respec-tive diameters and densities of uncoated wires.1.3 The values stated in inch-pound or SI units are to beregarded separately as standard. Each system shall be usedindependently o
5、f the other. Combining values from the twosystems 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 fromcorresponding values, stated or derived, in inch-pound units.For conductor sizes des
6、ignated by SI units only, the require-ments are stated or derived in SI units.1.3.1 For density, resistivity, and temperature, the valuesstated in SI units are to be regarded as standard.2. Referenced Documents2.1 The following documents of the issue in effect at thetime of reference form a part of
7、this specification to the extentreferenced herein:2.2 ASTM Standards:2B3 Specification for Soft or Annealed Copper WireB33 Specification for Tinned Soft or Annealed CopperWire for Electrical PurposesB 173 Specification for Rope-Lay-Stranded Copper Con-ductors Having Concentric-Stranded Members, for
8、Elec-trical ConductorsB 189 Specification for Lead-Coated and Lead-Alloy-Coated Soft Copper Wire for Electrical PurposesB 263 Test Method for Determination of Cross-SectionalArea of Stranded ConductorsB 354 Terminology Relating to Uninsulated Metallic Elec-trical Conductors2.3 American National Stan
9、dard:ANSI C42.35 Definitions of Electrical Terms33. Classification3.1 For the purpose of this specification rope-lay-strandedconductors having bunch-stranded members are classifed asfollows:3.1.1 Class IConductors consisting of wires 0.0201-in.(0.511-mm) diameter (No. 24 AWG) to produce rope-lay-str
10、anded conductors up to 2 000 000 cmil (1013 mm2) in totalcross-sectional area. (Typical use is for special apparatusconductor.)3.1.2 Class KConductors consisting of wires 0.0100-in.(0.254-mm) diameter (No. 30 AWG) to produce rope-lay-stranded conductors up to 1 000 000 cmil (507 mm2) in totalcross-s
11、ectional area. (Typical use is for special portable cordand conductors.)3.1.3 Class MConductors consisting of wires 0.0063-in.(0.160-mm) diameter (No. 34 AWG) to produce rope-lay-stranded conductors up to 1 000 000 cmil (507 mm2) in totalcross-sectional area. (Typical use is for welding conductors.)
12、4. Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Quantity of each size and class,4.1.2 Conductor size: circular-mil area or AWG (see 7.1),1This specification is under the jurisdiction of ASTM Committee B01 onElectrical Conductors an
13、d is the direct responsibility of Subcommittee B01.04 onConductors of Copper and Copper Alloys.Current edition approved March 15, 2007. Published April 2007. Originallyapproved in 1942 to replace portions of B 15841 T. Last previous edition approvedin 2001 as B 172 01a.2For referenced ASTM standards
14、, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New
15、 York, NY 10036, http:/www.ansi.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.1.3 Class (Section 4 and Table 1),4.1.4 Whether coated or uncoated; if coated, designate typeof coating (see 11.1),4.1.5 Details of special-purpose
16、 lays, if required (see 6.2,6.3, and Explanatory Note 3),4.1.6 Package size (see 15.1),4.1.7 Special package marking, if required (Section 14),4.1.8 Lagging, if required (see 15.2), and4.1.9 Place of inspection (Section 13).5. Joints5.1 Necessary joints in wires or in groups of wires shall bemade in
17、 accordance with accepted commercial practice, takinginto account the size of the wire or group of wires as related tothe size of the entire conductor.TABLE 1 Construction Requirements of Rope-Lay Stranded Copper Conductors Having Bunch-Stranded MembersAArea ofCrossSectionSizeAWGClass I Class K Clas
18、s MWireDiameter0.0201in.(0.511mm)ApproximateMassBWireDiameter0.0100in.(0.254mm)ApproximateMassBWireDiameter0.0063in.(0.160mm)ApproximateMassBcmil mm2 NominalNumberof WiresStrandConstructionClb/1000 ft.kg/kmNominalNumberof WiresStrandConstructionClb/1000 ft.kg/kmNominalNumberof WiresStrandConstructio
19、nClb/1000 ft.kg/km2 000 000 1013 . . . 4921 19 by 7 by 37 6439 9583 . . . . . . . . . . . . . . . . . . . . . . . .1 900 000 963 . . . 4788 19 by 7 by 36 6265 9324 . . . . . . . . . . . . . . . . . . . . . . . .1 800 000 912 . . . 4522 19 by 7 by 34 5917 8806 . . . . . . . . . . . . . . . . . . . .
20、. . . .1 750 000 887 . . . 4389 19 by 7 by 33 5743 8547 . . . . . . . . . . . . . . . . . . . . . . . .1 700 000 861 . . . 4256 19 by 7 by 32 5569 8288 . . . . . . . . . . . . . . . . . . . . . . . .1 600 000 811 . . . 3990 19 by 7 by 30 5221 7770 . . . . . . . . . . . . . . . . . . . . . . . .1 500
21、 000 760 . . . 3724 19 by 7 by 28 4873 7252 . . . . . . . . . . . . . . . . . . . . . . . .1 400 000 709 . . . 3458 19 by 7 by 26 4525 6734 . . . . . . . . . . . . . . . . . . . . . . . .1 300 000 659 . . . 3192 19 by 7 by 24 4177 6216 . . . . . . . . . . . . . . . . . . . . . . . .1 250 000 633 . .
22、 . 3059 19 by 7 by 23 4003 5957 . . . . . . . . . . . . . . . . . . . . . . . .1 200 000 608 . . . 2926 19 by 7 by 22 3829 5698 . . . . . . . . . . . . . . . . . . . . . . . .1 100 000 557 . . . 2793 19 by 7 by 21 3655 5439 . . . . . . . . . . . . . . . . . . . . . . . .1 000 000 507 . . . 2527 19 b
23、y 7 by 19 3307 4921 10 101 37 by 7 by 39 3272 4869 25 193 61 by 7 by 59 3239 4819900 000 456 . . . 2261 19 by 7 by 17 2959 4403 9065 37 by 7 by 35 2936 4369 22 631 61 by 7 by 53 2909 4329800 000 405 . . . 1995 19 by 7 by 15 2611 3885 7980 19 by 7 by 60 2585 3846 20 069 61 by 7 by 47 2580 38393750 00
24、0 380 . . . 1862 19 by 7 by 14 2436 3626 7581 19 by 7 by 57 2455 3654 18 788 61 by 7 by 44 2415 3594700 000 355 . . . 1729 19 by 7 by 13 2262 3367 6916 19 by 7 by 52 2240 3333 17 507 61 by 7 by 41 2251 3349650 000 329 . . . 1596 19 by 7 by 12 2088 3108 6517 19 by 7 by 49 2111 3141 16 226 61 by 7 by
25、38 2086 3104600 000 304 . . . 1470 7 by 7 by 30 1906 2836 5985 19 by 7 by 45 1938 2885 14 945 61 by 7 by 35 1921 2859550 000 279 . . . 1372 7 by 7 by 28 1779 2647 5453 19 by 7 by 41 1766 2628 13 664 61 by 7 by 32 1757 2614500 000 253 . . . 1225 7 by 7 by 25 1588 2363 5054 19 by 7 by 38 1637 2436 12
26、691 37 by 7 by 49 1631 2428450 000 228 . . . 1127 7 by 7 by 23 1461 2174 4522 19 by 7 by 34 1465 2180 11 396 37 by 7 by 44 1465 2180400 000 203 . . . 980 7 by 7 by 20 1270 1891 3990 19 by 7 by 30 1292 1923 10 101 37 by 7 by 39 1298 1932350 000 177 . . . 882 7 by 7 by 18 1143 1701 3458 19 by 7 by 26
27、1120 1667 8806 37 by 7 by 34 1132 1685300 000 152 . . . 735 7 by 7 by 15 953 1418 2989 7 by 7 by 61 959 1427 7581 19 by 7 by 57 975 1450250 000 127 . . . 637 7 by 7 by 13 826 1229 2499 7 by 7 by 51 802 1193 6384 19 by 7 by 48 821 1221211 600 107 0000 532 19 by 28 683 1017 2107 7 by 7 by 43 676 1006
28、5320 19 by 7 by 40 684 1018167 800 85.0 000 418 19 by 22 537 799 1666 7 by 7 by 34 535 795 4256 19 by 7 by 32 547 814133 100 67.4 00 342 19 by 18 439 654 1323 7 by 7 by 27 424 632 3325 19 by 7 by 25 427 636105 600 53.5 0 266 19 by 14 342 508 1064 19 by 56 338 503 2646 7 by 7 by 54 337 50183 690 42.4
29、 1 210 7 by 30 267 397 836 19 by 44 266 395 2107 7 by 7 by 43 268 39966 360 33.6 2 161 7 by 23 205 305 665 19 by 35 211 315 1666 7 by 7 by 34 212 31652 620 26.7 3 133 7 by 19 169 252 532 19 by 28 169 252 1323 7 by 7 by 27 168 25141 740 21.1 4 105 7 by 15 134 199 420 7 by 60 132 197 1064 19 by 56 134
30、 20033 090 16.8 5 84 7 by 12 107 159 336 7 by 48 106 157 836 19 by 44 105 15726 240 13.3 6 63 7 by 9 80 119 266 7 by 38 84 125 665 19 by 35 84 12520 820 10.5 7 . . . . . . . . . . . . 210 7 by 30 66 98 532 19 by 28 67 10016 510 8.37 8 . . . . . . . . . . . . 168 7 by 24 53 79 420 7 by 60 52 7813 090
31、 6.63 9 . . . . . . . . . . . . 133 7 by 19 42 62 336 7 by 48 42 6210380 5.26 10 . . . . . . . . 259 7by37 32 486530 3.31 12 . . . . . . . . . . . . . . . . . . . . . . . . 168 7 by 24 21 31Editorially corrected.AThe constructions shown in this table are typical of those used in the industry. It is
32、not intended that this table preclude other constructions which may be desireablefor specific applications. The constructions shown provide for a finished, non-covered, stranded conductor approximately of the area indicated. When specified by thepurchaser, the number or size of wires may be increase
33、d to provide additional area to compensate for draw-down during subsequent processing.BValues for the mass of the completed conductor are approximate. The mass values are based upon the standard stranding increments listed in Explanatory Note 6.CStrand Construction#A by #B by #C: where #C is the num
34、ber of wires in each bunch-stranded member; #B is the number of bunch stranded members whichmake-up each rope-stranded member; and #A (where used) is the number of rope-stranded members in the conductor. Where #A is not given, the conductor consists ofone rope-stranded member. For example, 19 by 7 b
35、y 32 indicates a construction consisting of 19 rope-stranded members, each of which consists of 7 bunch-strandedmembers with 32 wires each.B 172 01a (2007)e125.2 Bunch-stranded members or rope-stranded membersforming the completed conductor may be joined as a unit bysoldering, brazing, or welding.5.
36、3 Joints shall be so constructed and so disposed through-out the conductor that the diameter or configuration of thecompleted conductor is not substantially affected, and so thatthe flexibility of the completed conductor is not adverselyaffected.6. Lay (Explanatory Note 3)6.1 Conductors of the same
37、size and description furnishedon one order shall have the same lay.6.2 The length of lay of the outer layer of the rope-lay-stranded conductor shall not be less than 8 nor more than 16times the outside diameter of the completed conductor. Thelength of lay of the other layers shall be at the option o
38、f themanufacturer unless specifically agreed upon. The direction oflay of the outer layer shall be left-hand, unless the direction oflay is specified otherwise by the purchaser. The direction of layof the other layers shall be reversed in successive layers, unlessotherwise agreed upon by the manufac
39、turer and the purchaser.6.3 The length of lay of the bunch-stranded and rope-stranded members shall be not more than 30 times the outsidediameter of the member. The direction of lay shall be at theoption of the manufacturer unless specifically agreed upon.6.4 In very flexible conductors, such as wel
40、ding conductor,the direction of lay of the stranded members forming rope-lay-stranded conductor may be in the same, rather than in reversed,directions as prescribed above.7. Construction7.1 The area of cross section, and the number and diameterof wires for a variety of strand constructions in genera
41、l use areshown in Table 1.7.2 The number of individual wires may vary slightly fromthose shown in Table 1, provided the nominal cross-sectionalarea of the conductor at any point be not less than thatspecified.8. Physical and Electrical Tests8.1 Tests for the electrical properties of wires composingc
42、onductors made from soft or annealed copper wire, bare orcoated, shall be made before stranding.8.2 Tests for the physical properties of soft or annealedcopper wire, bare or coated, may be made upon the wiresbefore stranding or upon wires removed from the completedstranded conductors, but need not b
43、e made upon both. Careshall be taken to avoid mechanical injury and stretching whenremoving wires from the conductor for the purpose of testing.8.3 The physical properties of wire when tested beforestranding shall conform to the applicable requirements of 11.1.8.4 The physical properties of wires re
44、moved from thecompleted stranded conductor shall be permitted to vary fromthe applicable requirements of 11.1 by the following amounts(Explanatory Note 4):8.4.1 Average of Results Obtained on All Wires TestedThepercent minimum elongation may be reduced by the value of5 % from the values required for
45、 unstranded wires as specifiedby Specifications B 3, B 33, or B 189, as applicable. Forexample, where the unstranded wire specification requiresminimum elongation of 30 %, wire of that material removedfrom Specification B 172 stranded conductor shall meet aminimum elongation value of 25 %.8.4.2 Resu
46、lts Obtained on Individual WiresThe percentminimum elongation may be reduced by the value of 15 %from the values required for unstranded wires as specified bySpecifications B 3, B 33, or B 189, as applicable. For example,where the unstranded wire specification requires minimumelongation of 30 %, wir
47、e of that material removed fromSpecification B 172 stranded conductor shall meet a minimumelongation value of 15 %. If the reduction results in minimumelongation of less than 5 %, a minimum of 5 % shall apply.8.5 In the event that the requirements prescribed in 8.4.2 aremet, but those prescribed in
48、8.4.1 are not met, a retest shall bepermitted wherein all wires of a conductor of 100 wires or less,or 100 wires selected at random throughout a conductor ofmore than 100 wires, shall be tested for the purpose of finaldetermination of conformance to 8.4.8.6 Elongation tests to determine compliance s
49、hall not bemade on the conductor as a unit.8.7 If a tinning, lead-coating, or lead alloy-coating test isrequired, it shall be made on the wires prior to stranding.9. Density9.1 For the purpose of calculating mass, cross sections, etc.,the density of copper shall be taken as 8.89 g/cm3(0.32117lb/in.3) at 20C (Explanatory Note 5).10. Mass and Resistance10.1 The mass and electrical resistance of a unit length ofstranded conductor are a function of the length of lay (Explana-tory Note 6).11. Requirements for Wires11.1 The purchaser shall designate the type of wire and typeof
