0.71mm Copper Clad Steel Wire for Telecommunication Drop Wire ASTM B227 / 30% IACS

?0.71mm Copper Clad Steel Wire for Telecommunication Drop Wire ASTM B227 / 30% IACS
1. Scope
1.1 This specification covers bare hard-drawn round copperclad
steel wire for electrical purposes (Note 1).
NOTE 1—Wire ordered to this specification is not intended for redrawing.
If wire is desired for this purpose, consult the manufacturer.
1.2 Four grades of wire are specified, designated as follows
(Note 2): Grade 40 HS, Grade 40 EHS, Grade 30 HS, and
Grade 30 EHS.
NOTE 2—The grades covered by this specification correspond to the
following commercial designations:
Grade 40 HS, High Strength, 40 % Conductivity.
Grade 40 EHS, Extra High Strength, 40 % Conductivity
Grade 30 HS, High Strength, 30 % Conductivity.
Grade 30 EHS, Extra High Strength, 30 % Conductivity.
1.3 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are in SI units.
2. Referenced Documents
2.1 The following documents of the issue in effect on date
of material purchase form a part of this specification to the
extent referenced herein.
2.2 ASTM Standards: 2
B 193 Test Method for Resistivity of Electrical Conductor
Materials
B 258 Specification for Standard Nominal Diameters and
Cross-Sectional Areas ofAWG Sizes of Solid RoundWires
Used as Electrical Conductors
2.3 National Institute of Standards and Technology:
3. Ordering Information
3.1 Orders for material under this specification shall include
the following information:
3.1.1 Quantity of each size and grade,
3.1.2 Wire size: diameter in inches (see 5.1 and Table 1),
3.1.3 Grade (see 1.2 and Table 1),
3.1.4 Method of measuring elongation (see 7.3 and 7.4),
3.1.5 Package size (see 14.1),
3.1.6 Special package marking, if required (Section 13), and
3.1.7 Place of inspection (Section 15).
4. Material
4.1 The wire shall be composed of a steel core with a
substantially uniform and continuous copper cladding thoroughly
bonded to it throughout.
4.2 The finished copper-clad steel wire shall conform to the
requirements prescribed in this specification.
5. Dimensions and Permissible Variations
5.1 The size shall be expressed as the diameter of the wire
in decimal fractions of an inch using four places of decimals,
that is, in tenths of mils (Note 3).
NOTE 3—The values of wire diameters in Table 1 are given to the
nearest 0.0001 in. and correspond to the standard sizes given in Specification
B 258. In specifying diameters of wire or in inspecting wire,
express the diameter to the fourth decimal place. The diameters preceded
by asterisks are not in the American Wire Gage series and are also given
to four places of decimals. They correspond to certain numbers of the
Birmingham Wire Gage of the British Standard Wire Gage and are used
for communication lines. The use of gage numbers in specifying wire sizes
is not recognized in these specifications because of the possibility of
confusion. An excellent discussion of wire gages and related subjects is
contained in NBS Handbook 100 of the National Institute of Standards and
Technology
5.2 Within the range of diameters included in Table 1, the
wire shall not vary from the specified diameter by more than
the following amounts rounded off to the nearest 0.1 mil
(0.0001 in.):
Specified Diameter,
in. (mm)
Permissible Variations in Specified
Diameter
0.2043 (5.189) to 0.1000 (2.540), incl 61.5 %
0.0999 (2.537) to 0.0800 (2.032), incl 60.0015 in. (1.5 mils) (0.038 mm)
0.0799 (2.029) to 0.0600 (1.524), incl +0.0010 in. (1.0 mils) (0.025 mm)
–0.0015 in. (1.5 mils) (0.038 mm)
0.0599 (1.521) and under 60.0010 in. (1.0 mils) (0.025 mm)
5.3 Ten percent, but not less than five coils or spools (or all
if the lot is less than five) from any lot of wire, shall be gaged
at three places. If accessible, one gaging shall be taken near
each end and one near the middle. If any of the selected coils
or spools fail to conform to the requirements for diameter as
prescribed in 5.2, all coils or spools shall be gaged in the
manner specified.
6. Workmanship, Finish, and Appearance
6.1 The surface of the wire shall be smooth and free from
imperfections not consistent with good commercial practice.
7. Tensile Properties
7.1 The wire shall conform to the tensile requirements
prescribed in Table 1 (Note 4).
NOTE 4—The approximate properties of hard-drawn copper-clad steel
wire are shown in Table 2 for the information of the user of this
specification.

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