ASTM B869-07(2013)
(Specification)Standard Specification for Copper-Clad Steel Electrical Conductor for CATV Drop Wire
Standard Specification for Copper-Clad Steel Electrical Conductor for CATV Drop Wire
ABSTRACT
This specification covers hard-drawn round copper-clad steel electrical conductor for CATV drop wire (coaxial cable center conductor). The wire shall be composed of a steel core with a substantially uniform and continuous copper cladding thoroughly bonded to it throughout. The size shall be expressed as the diameter of the wire. The steel wire shall conform to the prescribed tensile strength, elongation, and breaking strength. Requirements for (1) tension and torsion tests, (2) method of determining the electrical resistance, (3) cladding uniformity in terms of thickness, and (4) joint construction are detailed. The prescribed density of the wire to be taken for calculating mass/unit length, cross section, and so forth is given.
SCOPE
1.1 This specification covers 21 % conductivity hard-drawn round copper-clad steel wire for coaxial cable center conductors (Note 1). Note 1—Wire ordered to this specification is not intended for redrawing since it is furnished in the hard-drawn temper. If wire is desired for the purpose, the manufacturer should be consulted.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
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Standards Content (Sample)
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Designation:B869 −07 (Reapproved 2013)
Standard Specification for
Copper-Clad Steel Electrical Conductor for CATV Drop Wire
This standard is issued under the fixed designation B869; 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 3.1.5 Place of inspection (13.2).
1.1 This specification covers 21 % conductivity hard-drawn
4. Material
round copper-clad steel wire for coaxial cable center conduc-
4.1 The wire shall be composed of a steel core with a
tors (Note 1).
substantially uniform and continuous copper cladding thor-
NOTE 1—Wire ordered to this specification is not intended for redraw-
oughly bonded to it throughout.
ing since it is furnished in the hard-drawn temper. If wire is desired for the
purpose, the manufacturer should be consulted. 4.2 The finished copper-clad steel wire shall conform to the
requirements in this specification.
1.2 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
5. Dimensions and Permissible Variations
conversions to SI units that are provided for information only
5.1 The size shall be expressed as the diameter of the wire
and are not considered standard.
in decimal fractions of an inch, using four places of decimals,
2. Referenced Documents
that is, in tenths of a mil (Note 2).
2.1 The following documents, of the issue in effect on the
NOTE 2—The values of wire diameters in Table 1 and Table 2 are given
date of material purchase, form a part of this specification to to the nearest 0.0001 in. (0.0025 mm) and correspond to the standard sizes
given in Specification B258. In specifying diameters of wire or inspecting
the extent referenced herein.
wire, the diameter should also be expressed to the fourth decimal place.
2.2 ASTM Standards:
An excellent discussion of wire gages and related subjects is contained in
B193 Test Method for Resistivity of Electrical Conductor NBS Handbook 100.
Materials
5.2 Within the range of diameters included in Table 1, the
B258 Specification for Nominal Diameters and Cross-
wire shall not vary from the specified diameter by more than
SectionalAreasofAWGSizesofSolidRoundWiresUsed
61 %, expressed to the nearest 0.0001 in. (0.0025 mm).
as Electrical Conductors
5.3 Ten percent, but not less than five reels (or all, if the lot
2.3 NIST Document:
is less than five), from any lot of wire shall be gaged.All reels
NBS Handbook 100—Copper Wire Tables
shall be gaged if any of the selected reels fail to conform to the
requirements for diameter.
3. Ordering Information
3.1 Orders for material under this specification shall include
6. Workmanship, Finish, and Appearance
the following information:
6.1 The surface of the wire shall be free from imperfections
3.1.1 Quantity of each size;
and be consistent with good commercial practice.
3.1.2 Wire size: diameter in inches (see 5.1 and Table 1);
3.1.3 Package size (see 15.1);
7. Tensile and Elongation Properties
3.1.4 Specialpackagemarking,ifrequired(Section15);and
7.1 The wire shall conform to a minimum tensile require-
ment of 120 000 psi (827 MPa) and a minimum elongation
This specification is under the jurisdiction of ASTM Committee B01 on
requirement of 1.0 %.
Electrical Conductors and is the direct responsibility of Subcommittee B01.06 on
Bi-Metallic Conductors.
7.2 Tension tests shall be made on representative samples.
Current edition approved April 1, 2013. Published April 2013. Originally
Unless otherwise agreed upon between the manufacturer and
approved in 1996. Last previous edition approved in 2007 as B869 – 07. DOI:
the purchaser, the elongation shall be determined by measure-
10.1520/B0869-07R13.
ments made between the jaws of the testing machine. The zero
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
lengthshallbethedistancebetweenthejawswhenaloadequal
Standards volume information, refer to the standard’s Document Summary page on
to 10 % of the specified tensile strength has been applied, and
the ASTM website.
the final length shall be the distance between the jaws at the
Available from National Institute of Standards and Technology (NIST), 100
Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov. time of rupture. The zero length shall be as near 10 in. (254
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B869−07 (2013)
TABLE 1 Properties of Hard-Drawn 21% Conductivity Copper-
fections of sufficient magnitude to indicate inherent defects or
Clad Steel Wire
imperfections in the wire.
Nominal Maximum
8.2.1 Examination of the wire at the break shall show no
Permissible Minimum Copper
Diameter, Resistance /1000 ft
A A
Variations Thickness, in.
A separation of copper from the steel.
in. at 20°C
0.0641 ±0.0006 in. 12.249 0.00096
0.0571 ±0.0006 in. 15.472 0.00086
9. Resistance
0.0508 ±0.0005 in. 19.521 0.00076
0.0453 ±0.0005 in. 24.608 0.00068 9.1 The electrical resistance of the wire (Note 4) shall be
0.0403 ±0.0004 in. 31.024 0.00060
determined by resistance measurements, and maximum resis-
0.0320 ±0.0003 in. 49.150 0.00048
tance shall be based on the minimum diameter of the wire and
0.0285 ±0.0003 in. 62.107 0.00043
resistivity value at 20°C Ω cmil/ft of 49.39. This is to
A
Metric equivalents: 1 in. = 25.4 mm.
correspond to a minimum conductivity of 21 % IACS.
NOTE 4—Electrical resistance is calculated by the following equation:
TABLE 2 Approximate Properties (Information Only)
resistivity,Ω 3circular mil/ft
Rated
Area maximum resistance ~Ω/ft! 5
Nominal
Breaking Mass Mass ~minimum diameter, mil!
Diameter,
Strength, (lb/1000 ft) (lb/mile)
A
2A
in.
cmil in.
9.2 The maximum resistance values are given in Table 1.
min, lb
0.0641 4108 0.003227 387 11.10 58.60
9.3 When resistance measurements are made at tempera-
0.0571 3260 0.002560 307 9.05 47.78
tures other than 20°C, corrections shall be based on a tempera-
0.0508 2580 0.002026 243 6.99 36
...
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