ASTM B738-03
(Specification)Standard Specification for Fine-Wire Bunch-Stranded and Rope-Lay Bunch-Stranded Copper Conductors for Use as Electrical Conductors
Standard Specification for Fine-Wire Bunch-Stranded and Rope-Lay Bunch-Stranded Copper Conductors for Use as Electrical Conductors
SCOPE
1.1 This specification covers bare bunch-stranded and rope-lay bunch-stranded conductors made from round copper wires finer than No. 40 AWG with diameters less than 0.0031 in. (.078 mm), either coated or uncoated with tin or silver, for use as electrical conductors. (Explanatory Note 1).
1.2 The values (SI units) for density and temperature are regarded as the standard. For all other properties the inch-pound values are to be regarded as standard, and the SI units may be approximate.
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Designation: B 738 – 03
Standard Specification for
Fine-Wire Bunch-Stranded and Rope-Lay Bunch-Stranded
1
Copper Conductors for Use as Electrical Conductors
This standard is issued under the fixed designation B 738; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.1 Type:
3.1.1.1 Type B—Bunch-stranded conductors.
1.1 This specification covers bare bunch-stranded and rope-
3.1.1.2 Type R—Rope-lay bunch-stranded conductors.
lay bunch-stranded conductors made from round copper wires
3.1.2 Class:
finer than No. 40 AWG with diameters less than 0.0031 in.
3.1.2.1 Class R—Stranded conductors using wire 42 AWG
(.078 mm), either coated or uncoated with tin or silver, for use
(0.0025).
as electrical conductors. (Explanatory Note 1).
3.1.2.2 Class S—Stranded conductors using wire 44 AWG
1.2 The values (SI units) for density and temperature are
(0.0020).
regarded as the standard. For all other properties the inch-
3.1.2.3 Class T—Stranded conductors using wire 46 AWG
pound values are to be regarded as standard, and the SI units
(0.00157).
may be approximate.
3.1.2.4 Class U—Stranded conductors using wire 48 AWG
2. Referenced Documents (0.00124).
3.1.2.5 Class V—Stranded conductors using wire 50 AWG
2.1 ASTM Standards:
(0.00099).
B 33 Specification for Tinned Soft or Annealed Copper
2
3.2 Detailed information on Type B Conductors is found in
Wire for Electrical Purposes
Table 1 and Table 2. Detailed information on Type R Conduc-
B 49 Specification for Copper Rod Drawing Stock for
3
tors is found in Table 3 and Table 2.
Electrical Purposes
B 172 Specification for Rope-Lay Stranded Copper Con-
4. Ordering Information
ductors Having Bunch-Stranded Members, for Electrical
2
4.1 Orders for materials under this specification shall in-
Conductors
clude the following information:
B 174 Specification for Bunch-Stranded Copper Conduc-
2 4.1.1 Quantity of each size, class, and type,
tors for Electrical Conductors
4.1.2 Conductor size—circular-mil area, dc resistance (7.1)
B 193 Test Method for Resistivity of Electrical Conductor
2 or AWG (5.2.1),
Materials
4.1.3 Class and type (Section 3),
B 258 Specification for Standard Nominal Diameters and
4.1.4 Whether coated or uncoated; if coated, designate type
Cross-SectionalAreasofAWGSizesofSolidRoundWires
2
of coating (6.1); if silver coated, the minimum thickness of
Used as Electrical Conductors
silver (6.1.2), and whether tarnish protection is desired (11.3),
B 298 Specification for Silver-Coated Soft or Annealed
2
4.1.5 Maximum length of lay (5.2.4), if required,
Copper Wire
4.1.6 Temper (6.2),
B 354 Terminology Relating to Uninsulated Metallic Elec-
2
4.1.7 Separators, if required (5.2.2),
trical Conductors
4.1.8 Package size (11.1),
3. Classification
4.1.9 Special package marking, if required (Section 10), and
4.1.10 Place of inspection (Section 9).
3.1 For the purposes of this specification, the following
4.2 In addition, Supplementary Requirements shall apply
classifications have been assigned (Explanatory Note 2):
onlywhenspecifiedbythepurchaserintheinquiry,contract,or
purchase order for direct procurement by agencies of the U.S.
1
This specification is under the jurisdiction of ASTM Committee B01 on
Government.
Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on
Conductors of Copper and Copper Alloys.
Current edition approved October 1, 2003. Published October 2003. Originally
approved in 1984. Last previous edition approved in 1998 as B 738 – 98.
2
Annual Book of ASTM Standards, Vol 02.03.
3
Annual Book of ASTM Standards, Vol 02.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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B 738–03
TABLE 1 Classification of Type B Bunch-Stranded Conductors
ness shall be determined using the method for determining
A
Class Wire Diameter, in. Conductor Sizes, AWG plating thickness described in Specification B 298.
6.1.3 The finished diameter and mass of the coated wires
R 0.0025 (No. 42 AWG) 24,26,28,30,32,34
S 0.0020 (No. 44 AWG) 26,28,30,32,34,36
used shall be substantially equal to those of the uncoated wires
T 0.00157 (No. 46 AWG) 28,30,32,34,36,38
of the same class.
U 0.00124 (No. 48 AWG) 30,32,34,36,38,40
V 0.00099 (No. 50 AWG) 32,34,36,38,40 6.2 Temper—Unless otherwise specified, all coated conduc-
A
tors shall be furnished in the annealed temper. Uncoated
Sufficient quantities of wires of these diameters shall be used to form
conductors having cross-sectional areas approximately equal to theAWG conduc-
conductors may be furn
...
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