ASTM B174-02(2007)e1

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: B174 – 02 (Reapproved 2007)
Standard Specification for
Bunch-Stranded Copper Conductors for Electrical
Conductors
This standard is issued under the fixed designation B174; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
´ NOTE—Table 1 was editorially corrected in March 2007.
1. Scope B189 Specification for Lead-Coated and Lead-Alloy-
Coated Soft Copper Wire for Electrical Purposes
1.1 This specification covers bare bunch-stranded conduc-
B263 Test Method for Determination of Cross-Sectional
tors made from round copper wires, either uncoated or coated
Area of Stranded Conductors
with tin, lead, or lead-alloy for use as electrical conductors
B354 Terminology Relating to Uninsulated Metallic Elec-
(Explanatory Note 1 and Explanatory Note 2).
trical Conductors
1.2 Coated wires shall include only those wires with fin-
2.3 American National Standard:
ished diameters and densities substantially equal to the respec-
ANSI C42.35 Definitions of Electrical Terms
tive diameters and densities of uncoated wires.
1.3 The values stated in inch-pound or SI units are to be
3. Classification
regarded separately as standard. Each system shall be used
3.1 For the purpose of this specification bunch-stranded
independently of the other. Combining values form the two
conductors are classified as shown in Table 1.
systems may result in nonconformance with the specification.
For conductor sizes designated byAWG or kcmil, the require-
4. Ordering Information
ments in SI units have been numerically converted from
4.1 Orders for material under this specification shall include
corresponding values, stated or derived, in inch-pound units.
the following information:
For conductor sizes designated by SI units only, the require-
4.1.1 Quantity of each size and class,
ments are stated or derived in SI units.
4.1.2 Conductor size: circular-mil area or AWG (see 7.1),
4.1.3 Class (Section 3 and Table 2),
2. Referenced Documents
4.1.4 Whether coated or uncoated; if coated, designate type
2.1 The following documents of the issue in effect at the
of coating (see 11.1),
time of reference form a part of this specification to the extent
4.1.5 Maximum length of lay (see 6.3),
referenced herein:
2 4.1.6 Whether separator is required (see 7.2),
2.2 ASTM Standards:
4.1.7 Package size (see section 15.1),
B3 Specification for Soft or Annealed Copper Wire
4.1.8 Specialpackagemarking,ifrequired(Section14),and
B33 Specification forTinned Soft orAnnealed CopperWire
4.1.9 Place of inspection (Section 13).
for Electrical Purposes
B172 Specification for Rope-Lay-Stranded Copper Con-
5. Joints
ductors Having Bunch-Stranded Members, for Electrical
5.1 Necessary joints in wires shall be made in accordance
Conductors
with accepted commercial practice.
5.2 Joints shall be so constructed and so disposed through-
This specification is under the jurisdiction of ASTM Committee B01 on
out the conductor that the diameter or configuration of the
Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on
completed conductor is not substantially affected, and so that
Conductors of Copper and Copper Alloys.
Current edition approved March 15, 2007. Published April 2007. Originally
the flexibility of the completed conductor is not adversely
approved in 1941. Last previous edition approved in 2002 as B174 – 02. DOI:
affected.
10.1520/B0174-02R07E01.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
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B174 – 02 (2007)
A
TABLE 1 Classification and Construction Requirements of Bunch-Stranded Conductors
Classification, Size, and Minimum Number of Wires
Class I Class J Class K Class L Class M Class O Class P Class Q
Area of
Cross Section
Wire
Size, Wire Wire Wire Wire Wire Wire Wire
Diameter
AWG
Diameter Diameter Diameter Diameter Diameter Diameter Diameter
0.0031 in.
0.0201 in. 0.0126 in. 0.0100 in. 0.0080 in. 0.0063 in. 0.0050 in. 0.0040 in.
(0.079 mm)
(0.511 mm) (0.320 mm) (0.254 mm) (0.203 mm) (0.160 mm) (0.127 mm) (0.102 mm)
cmil mm † No. 40
No. 24 AWG No. 28 AWG No. 30 AWG No. 32 AWG No. 34 AWG No. 36 AWG No. 38 AWG
AWG
20 820 10.5 7 52 . . . . . . .
16 510 8.37 8 41 . . . . . . .
13 090 6.63 9 33 . . . . . . .
10 380 5.26 10 26 65 104 165 . . . .
6 530 3.31 12 . 41 65 104 . . . .
4 110 2.08 14 . 26 41 65 104 . . .
2 580 1.31 16 . 16 26 41 65 104 165 .
1 620 0.821 18 . 10 16 26 41 65 104 165
B
1 020 0.517 20 . 7 10 16 26 41 65 104
640 0.324 22 . . 7 . 19 . . .
404 0.205 24 . . . 7 . 19 . .
253 0.128 26 . . . . 7 . . .
159 0.0806 28 . . . . . . . .
†Editorially corrected.
A
The constructions shown in this table are typical of those used in the industry. It is not intended that this table preclude other constructions which 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
purchaser, the number or size of wires may be increased to provide additional area to compensate for draw-down during subsequent processing.
B
As an alternate to the construction shown for No. 20 AWG, Class K; for hook-up wire construction may consist of 8 wires 0.0100 in. (0.254 mm) diameter around 1
wire of 0.0142 in. (0.361 mm) diameter.
TABLE 2 Maximum Length of Lay for Bunch-Stranded
7. Construction
Conductors
7.1 The area of cross section, and the number and diameter
Maximum Length of Lay
Area of of wires for a variety of strand constructions in general use are
Size, Nominal Column Column
Cross Section
shown in Table 1.
AWG Diameter A B
7.2 If a separator is required to be furnished with the
cmil mm in. mm in. mm in. mm
conductor, it shall be at the option of the manufacturer unless
20 820 10.5 7 0.167 4.24 3.00 76.20 3.00 76.20
otherwise specified by the purchaser as to requirements for the
16 510 8.37 8 0.149 3.78 2.75 69.85 2.75 69.85
13 090 6.63 9 0.133 3.38 2.50 63.50 2.50 63.50
kind and thickness of material and its application details.
10 380 5.26 10 0.118 3.00 2.50 63.50 2.50 63.50
6 530 3.31 12 0.093 2.36 2.00 50.80 2.00 50.80
8. Physical and Electrical Tests
4 110 2.08 14 0.074 1.88 2.00 50.80 1.75 44.45
2 580 1.31 16 0.059 1.50 2.00 50.80 1.50 38.10
8.1 Tests for the electrical properties of wires composing
1 620 0.821 18 0.047 1.19 2.00 50.80 1.25 31.75
1 020 0.517 20 0.037 0.94 2.00 50.80 1.00 25.40 conductors made from soft or annealed copper wire, bare or
640 0.324 22 0.030 0.76 1.30 33.02 0.80 20.32
coated, shall be made before stranding.
404 0.205 24 0.024 0.61 1.20 30.48 0.70 17.78
8.2 Tests for the physical properties of soft or annealed
253 0.128 26 0.019 0.48 1.00 25.40 0.60 15.24
159 0.0806 28 0.015 0.38 1.00 25.40 0.50 12.70
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 purpose of testing.
6. Lay
8.3 The physical properties of wire when tested before
6.1 C
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