ASTM B496-04

Standard Specification for Compact Round Concentric-Lay-Stranded Copper Conductors

ABSTRACT
This specification covers bare compact round concentric-lay-stranded conductors made from uncoated round copper wires for general use for electrical purposes. Welds and brazes shall be made in rods and wires prior to final drawing. The conductors shall conform to the required construction values of nominal cross-sectional area, diameter, mass per unit length and dc electrical resistance. Tests for the physical and electrical properties of wires composing the conductors shall be made before stranding.
SCOPE
1.1 This specification covers bare compact round concentric-lay-stranded conductors made from uncoated round copper wires for general use for electrical purposes. These conductors shall be constructed with a central core surrounded by one or more layers of helically laid compacted wires (Explanatory and Note 0).
1.2 The values stated in inch-pound or SI units are to be regarded separately as standard. The values in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
1.2.1 For density, resistivity, and temperature, the values stated in SI units are to be regarded as standard.

General Information

• Status: Historical
• Publication Date: 31-Mar-2004
• ICS: 29.240.20 - Power transmission and distribution lines
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.04 - Conductors of Copper and Copper Alloys

Relations

• Replaces: ASTM B496-01 - Standard Specification for Compact Round Concentric-Lay-Stranded Copper Conductors
• Effective Date: 01-Apr-2004
• Replaced By: ASTM B496-04(2010)e1 - Standard Specification for Compact Round Concentric-Lay-Stranded Copper Conductors
• Effective Date: 01-Oct-2010
• Referred By: ASTM B226-11(2021) - Standard Specification for Cored, Annular, Concentric-Lay-Stranded Copper Conductors
• Effective Date: 01-Apr-2004

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: B496 – 04
Standard Specification for
Compact Round Concentric-Lay-Stranded Copper
1
Conductors
This standard is issued under the fixed designation B496; 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.
1. Scope 3.1.3 Packaging (Section 14), if required,
3.1.4 Special package marking, and
1.1 This specification covers bare compact round
3.1.5 Place of inspection (Section 16).
concentric-lay-stranded conductors made from uncoated round
copper wires for general use for electrical purposes. These
4. Joints
conductors shall be constructed with a central core surrounded
4.1 Welds and brazes may be made in rods or in wires prior
by one or more layers of helically laid compacted wires
to final drawing.
(Explanatory Note 1 and Note 2).
4.2 Welds and brazes may be made in the individual round
1.2 The values stated in inch-pound or SI units are to be
drawn wires for compact conductors, but shall not be closer
regarded separately as standard. The values in each system are
together than 1 ft (300 mm) for conductor of 19 wires or less
not exact equivalents; therefore, each system shall be used
or closer than 1 ft (300 mm) in a layer for conductor of more
independently of the other. Combining values from the two
than 19 wires.
systems may result in nonconformance with the specification.
4.3 No joint nor splice shall be made in a compact-stranded
1.2.1 For density, resistivity, and temperature, the values
conductor as a whole.
stated in SI units are to be regarded as standard.
5. Lay
2. Referenced Documents
5.1 The length of lay shall be not less than 8 nor more than
2.1 The following documents of the issue in effect on date
16 times the outside diameter of the completed conductor.
of material purchase form a part of this specification to the
5.2 The direction of lay of the outer layer shall be left-hand,
extent referenced herein:
2 and it shall be reversed in successive layers, unidirectional, or
2.2 ASTM Standards:
unilay.
B3 Specification for Soft or Annealed Copper Wire
B263 Test Method for Determination of Cross-Sectional
6. Construction
Area of Stranded Conductors
6.1 The construction of the compact round concentric-lay-
B354 Terminology Relating to Uninsulated Metallic Elec-
stranded conductors shall be as shown in Table 1.
trical Conductors
6.2 The starting round copper wires used in the fabrication
3. Ordering Information of the compact round conductor shall be of such diameter as to
produce a finished conductor having a nominal cross-sectional
3.1 Orders for material under this specification shall include
area and diameter as prescribed in Table 1.
the following information:
3.1.1 Quantity of each size (Table 1),
7. Density
3.1.2 Conductor size; circular-mil area or AWG, (Section 6
7.1 For the purpose of calculating linear densities, cross
and Table 1),
sections, and so forth, the density of the copper shall be taken
3 3
as 8.89 g/cm (0.32117 lb/in. ) at 20°C.
1
This specification is under the jurisdiction of ASTM Committee B01 on
Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on 8. Mass and Resistance
Conductors of Copper and Copper Alloys.
8.1 The mass per unit length and dc electrical resistance of
Current edition approved April 1, 2004. Published April 2004. Originally
a compact round conductor are greater than the total of these
approved in 1969. Last previous edition approved in 2001 as B496 – 01. DOI:
10.1520/B0496-04.
characteristics of the compressed wires composing the finished
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
conductor, depending upon the lay. The standard increment of
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
mass per unit length and electrical resistance shall be taken as
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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1

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B496 – 04
TABLE 1 Construction Requirements of Compact Round Concentric-Lay-Stranded Copper Conductors
Conductor Size Compact Conductor Diameter DC Resistance at 20°C
Number of Mass, Mass,
2
Wires lb/1000 ft kg/km
cmil AWG mm in. mm V/1000 ft V/km
A
1 000 000 . 507 61 1.060 26.9 3086 4590 0.0106 0.0347
A
900 000 . 456 61 0.999 25.4 2780 4140 0.0118 0.0386
A
800 000 . 405 61 0.938 23.8 2469 3680 0.0132 0.0433
A
750 000 . 380 61 0.908 23.0 2316 3450 0.0141 0.0462
A
700 000 . 355 61 0.877 22.3 2160 3220 0.0151 0.0495
A
650 000 . 329 61 0.845
...