Standard Specification for Modified Concentric-Lay-Stranded Copper Conductors for Use in Insulated Electrical Cables

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1.1 This specification covers bare modified concentric-lay-stranded conductors made from round copper wires, either uncoated or coated with tin, lead, or lead alloy for general use in insulated electrical cables. These conductors shall be constructed with a central core consisting of not more than seven wires, surrounded by one or more layers of helically laid wires.
1.2 For the purposes of this specification, conductors are classified as follows (Explanatory Note 1 and Note 2):
1.2.1 Class B Modified--Conductors to be insulated with various materials such as rubber, paper, and crosslink polyethylene.
1.2.2 Class C Modified and Class D Modified--Conductors where greater flexibility is required than is provided by Class B Modified conductors.
1.3 The values stated in inch-pound or SI units are to be regarded separately as standard. Each system shall be used independently of the other. Combining the values from the two systems may result in non- conformance with the specification. For conductor sizes designated by AWG or kcmil sizes, the requirements in SI units are numerically converted from the corresponding requirements in inch-pound units. For conductor sizes designated by AWG or kcmil, the requirements 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 requirements are stated or derived in SI units.
1.3.1 For density, resitivity and temperature, the values stated in SI units are to be regarded as standard.
Note 1--The significant differences in this specification from Specification B 8 are as follows: (1) The central core is permitted to contain up to seven wires drawn into the assembly with an infinite length of lay while Specification B8 permits only one, and (2) The construction is applicable only to stranded assemblies of 19 or more wires.

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ASTM B784-01 - Standard Specification for Modified Concentric-Lay-Stranded Copper Conductors for Use in Insulated Electrical Cables
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: B 784 – 01
Standard Specification for
Modified Concentric-Lay-Stranded Copper Conductors for
1
Use in Insulated Electrical Cables
This standard is issued under the fixed designation B 784; 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.
only to stranded assemblies of 19 or more wires.
1. Scope
1.1 This specification covers bare modified concentric-lay-
2. Referenced Documents
stranded conductors made from round copper wires, either
2.1 The following documents of the issue in effect at the
uncoated or coated with tin, lead, or lead alloy for general use
dateofmaterialpurchaseformapartofthisspecificationtothe
in insulated electrical cables. These conductors shall be con-
extent referenced herein.
structed with a central core consisting of not more than seven
2.2 ASTM Standards:
wires, surrounded by one or more layers of helically laid wires.
2
B 3 Specification for Soft or Annealed Copper Wire
1.2 For the purposes of this specification, conductors are
B 8 Specification for Concentric-Lay-Stranded Copper
classified as follows (Explanatory Note 1 and Note 2):
2
Conductors, Hard, Medium-Hard, or Soft
1.2.1 Class B Modified—Conductors to be insulated with
B 33 Specification for Tinned Soft or Annealed Copper
various materials such as rubber, paper, and crosslink polyeth-
2
Wire for Electrical Purposes
ylene.
B 189 Specification for Lead-Coated and Lead-Alloy
1.2.2 Class C Modified and Class D Modified—Conductors
2
Coated Soft Copper Wire for Electrical Purposes
where greater flexibility is required than is provided by Class
B 263 Test Method for Determination of Cross-Sectional
B Modified conductors.
2
Area of Stranded Conductors
1.3 The values stated in inch-pound or SI units are to be
B 354 Terminology Relating to Uninsulated Metallic Elec-
regarded separately as standard. Each system shall be used
2
trical Conductors
independently of the other. Combining the values from the two
2.3 Other Standard:
systems may result in non- conformance with the specification.
3
NBS Handbook 100
For conductor sizes designated by AWG or kcmil sizes, the
requirements in SI units are numerically converted from the
3. Ordering Information
correspondingrequirementsininch-poundunits.Forconductor
3.1 Orders for material under this specification shall include
sizesdesignatedbyAWGorkcmil,therequirementsinSIunits
the following information:
have been numerically converted from corresponding values
3.1.1 Quantity of each size and class,
stated or derived in inch-pound units. for conductor sizes
3.1.2 Conductor size: circular-mil area or American Wire
designated by SI units only, the requirements are stated or
Gage (AWG) (Section 6),
derived in SI units.
3.1.3 Class (see 1.2 and Table 1),
1.3.1 For density, resitivity and temperature, the values
3.1.4 Temper (see 10.2),
stated in SI units are to be regarded as standard.
3.1.5 Whether coated or uncoated; if coated, designate type
NOTE 1—The significant differences in this specification from Specifi-
of coating (see 10.1 and 10.2),
cation B 8 are as follows: (1) The central core is permitted to contain up
3.1.6 Details of special-purpose lays, if required (see 5.2),
to seven wires drawn into the assembly with an infinite length of lay while
3.1.7 Lagging, if required (see 14.2),
Specification B 8 permits only one, and (2) The construction is applicable
3.1.8 Special package marking, if required (Section 13),
3.1.9 Place of inspection (Section 12), and
1
This specification is under the jurisdiction of ASTM Committee B01 on
Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on
2
Conductors of Copper and Copper Alloys. Annual Book of ASTM Standards, Vol 02.03.
3
Current edition approved Mar. 10, 2001. Published May 2001. Originally Available from the National Technical Information Service, 5285 Port Royal
published as B 784 – 88. Last previous edition B 784 – 94. Rd., Springfield, VA 22161.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

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B 784
TABLE 1 Construction Requirements of Modified Concentric-Lay-Stranded Copper Conductors
NOTE 1—See Explanatory Note 5.
Class B Modified Class C Modified Class D Modified
Size
Circular Mils American Diameter Diameter Diameter
Number of Number of Number of
Wire Gage
Wires Wires Wires
(mils) (mm) (mils) (mm) (mils) (mm)
A
5 000 000 217 151.8 3.86 271 135.8 3.45 271 135.8 3.45
4 000 000 217 144.0 3.66 271 128.9 3.27 271 128.9 3.27
4 000 000 217 135.8 3.45 271 121.5 3.09 271 121.5 3.09
3 500 000 169 143.9 3.66 217
...

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