ASTM B324-01(2021)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:B324 −01 (Reapproved 2021)
Standard Specification for
Aluminum Rectangular and Square Wire for Electrical
Purposes
This standard is issued under the fixed designation B324; 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 2.2 ASTM Standards:
B193 Test Method for Resistivity of Electrical Conductor
1.1 This specification covers aluminum 1350-O, annealed,
Materials
1 1
1350-H12 or -H22 ( ⁄4 hard), 1350-H14 or -H24 ( ⁄2 hard),
B233 Specification for Aluminum 1350 Drawing Stock for
1350-H16 or -H26 ( ⁄4 hard), and 1350-H19 (extra hard) wire,
Electrical Purposes
rectangular or square in shape with rounded corners for use as
B279 Test Method for Stiffness of Bare Soft Square and
electrical conductors in insulated magnet wire.
Rectangular Copper andAluminumWire for MagnetWire
1.2 The values stated in inch-pound or SI units are to be
Fabrication
regarded separately as standard. Each system shall be used
B557 Test Methods for Tension Testing Wrought and Cast
independently of the other. Combining the values from the two
Aluminum- and Magnesium-Alloy Products
systems may result in non-conformance with the specification.
B830 Specification for Uniform Test Methods and Fre-
For conductor sizes designated by AWG or kcmil sizes, the
quency
requirements in SI units are numerically converted from the
E29 Practice for Using Significant Digits in Test Data to
correspondingrequirementsininch-poundunits.Forconductor
Determine Conformance with Specifications
sizesdesignatedbyAWGorkcmil,therequirementsinSIunits
E527 Practice for Numbering Metals and Alloys in the
have been numerically converted from corresponding values
Unified Numbering System (UNS)
stated or derived in inch-pound units. For conductor sizes 3
2.3 ANSI Standard:
designated by SI units only, the requirements are stated or
H35.1/H35.1(M) Standard for Alloy and Temper Designa-
derived in SI units.
tion Systems for Aluminum
1.2.1 For density, resistivity and temperature, the values 4
2.4 American National Standards:
stated in SI units are to be regarded as standard.
NBS Handbook 100 —Copper Wire Tables
NBS Handbook 109 —Aluminum Wire Tables
NOTE 1—The aluminum and temper designations conform to ANSI
H35.1. Aluminum 1350 corresponds to Unified Numbering System
A91350 in accordance with Practice E527. 3. Description of Terms Specific to This Standard
1.3 This international standard was developed in accor-
3.1 lot—an inspection lot shall consist of an identifiable
dance with internationally recognized principles on standard-
quantity of wire subjected to inspection at one time. Each lot
ization established in the Decision on Principles for the
shall consist of units of wire of the same size and temper,
Development of International Standards, Guides and Recom-
manufactured under essentially the same conditions at essen-
mendations issued by the World Trade Organization Technical
tially the same time. The amount in any case shall not exceed
Barriers to Trade (TBT) Committee.
30 000 lb (14 000 kg).
3.2 sample—a quantity of production units (coils, reels,
2. Referenced Documents
spools) selected at random from the lot for the purpose of
2.1 The following documents of the issue in effect on date
determining conformance of the lot to the requirements of this
of material purchase form a part of this specification to the
specification.
extent referenced herein:
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
This specification is under the jurisdiction of ASTM Committee B01 on Standards volume information, refer to the standard’s Document Summary page on
Electrical Conductors and is the direct responsibility of Subcommittee B01.07 on the ASTM website.
Conductors of Light Metals. Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
Current edition approved Oct. 1, 2021. Published October 2021. Originally 4th Floor, New York, NY 10036, http://www.ansi.org.
approved in 1984. Last previous edition approved in 2016 as B324 – 01 (2016). Available from National Institute of Standards and Technology (NIST), 100
DOI: 10.1520/B0324-01R21. Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B324−01 (2021)
3.3 sample size—the number of production units selected. 6.2.1 All tempers except 1 350-O,—0.028264 Ω·mm /m
(17.002 Ω·cmil/ft) at 20 °C, (61.0 Volume Conductivity %
3.4 specimen—a length of wire removed for test purposes
IACS).
from any individual production unit of the sample.
6.2.2 For 1350-O—0.027898 Ω·mm /m (16.782 Ω·cmil/ft)
at 20 °C, (61.8 Volume Conductivity % IACS).
4. Ordering Information
6.3 Joints—The finished wire shall not contain joints except
4.1 Orders for material under this specification shall include
such as have passed through drawing dies or an equivalent
the following information:
rolling operation. Necessary joints in the wire and rods prior to
4.1.1 Quantity and temper of each size and shape (see
final drawing or rolling shall be made in accordance with good
Section 5),
commercial practice.
4.1.2 Wire size; thickness and width in inches or in milli-
metres (see Section 7),
6.4 Bending Properties—1350-O wire shall be capable of
4.1.3 Mandrel diameter for the edgewise bend test,
being bent edgewise through 180° around a mandrel without
4.1.4 Place of inspection if other than at place of manufac-
cracking under normal conditions of edgewise bending during
ture (see 12.2),
manufacturing operations. The mandrel diameter shall be as
4.1.5 Whether inspection or witness of inspection and tests
agreed upon between the manufacturer and the user, and shall
by purchaser’s representative is required prior to shipment (see
be not less than one half the nominal width of the material
12.3),
being bent. In cases where the mandrel diameter used is less
4.1.6 Packaging and marking (see Section 13), and
than ⁄32 in. (3.97 mm) or the thickness of the wire is less than
4.1.7 Special package marking, if required (see 13.4).
0.020 in. (0.51 mm) or the ratio of width to thickness of the
wire is greater than 12 to 1, the edgewise bending properties of
5. Materials and Manufacture
the wire shall be as agreed upon between the user and the
5.1 Material:
manufacturer (see Explanatory Note 3 and Explanatory Note
5.1.1 The aluminum wire shall be made from rod in
4).
accordance with the requirements of Specification B233.
6.5 Low Stress Elongation (LSE)—The annealed wire
5.2 Manufacture:
(0 temper)shallhaveaminimumLSEvalveof1 %determined
5.2.1 Unless otherwise specified, the manufacturer shall
in accordance with Test Method B279. LSE test results are
havetheoptionofproducingtheintermediatetempersbyeither
affected by small amounts of cold working. The specified 1 %
strain-hardening (only for H12, H14, H16 and H19) or by
minimum LSE value applies only to bare wires for further
strain-hardening and annealing (1350-O) or partial annealing
processing.
H22, H24 and H26) (Explanatory Note 1 and
ANSI H35.1⁄H35.1(M)).
7. Dimensions and Permissible Variations
5.2.1.1 When the manufacturer is given the option in 5.2.1,
7.1 The dimensions shall be expressed in decimal fractions
the intermediate tempers shall be specified as: H12 or H22;
of an inch or in millimetres (Explanatory Notes 5-8).
H14 or H24; H16 or H26.
7.1.1 The thickness shall not vary from that specified by
5.2.1.2 When the manufacturer is not given the option in
more than the amounts shown in Table 2.
5.2.1, the specific temper should be specified, for example,
7.1.2 The width shall not vary from that specified by more
H19, H22, etc.
than the amount shown in Table 3.
6. General Requirements
7.2 The wire shall have rounded corners or rounded edges
as specified in Table 4 and as shown in Fig. 1. Where rounded
6.1 Tensile Properties—The wire shall conform to the re-
corners are required, the corners of the wire shall be rounded
quirements for tensile properties prescribed in Table 1.
within the limits of radii 25 % under and 25 % over (as
6.2 Resistivity—The electrical resistivity of the wire shall
determined by a radius gage) those values specified in Table 4.
not exceed the following values (Explanatory Note 2):
8. Workmanship, Finish, and Appearance
TABLE 1 Tensile Requirements 8.1 The wire shall be free of all imperfections not consistent
with good commercial practice.
NOTE 1—For purposes of determining conformance with these
specifications, each calculated value of tensile strength shall be rounded
off to the nearest 0.1 ksi, in accordance with the rounding method of
Practice E29.
Tensile Strength
TABLE 2 Permissible Variations in Thickness
Temper
Max Min
Permissible Variations in
ksi MPa ksi MPa Specified Thickness, in. (mm) Thickness, in. (mm), plus and
−0 14.0 97 8.5 59 minus
−H12, − H22 17.0 117 12.0 83 0.280 to 0.098 1%
−H14, − H24 20.0 138 15.0 103 (7.10 to 2.50), incl
−H16, − H26 22.0 152 17.0 117 Under 0.098 to 0.025 0.001 (0.025)
−H19 29.0 200 22.0 152 (2.50 to 0.63), incl
B324−01 (2021)
TABLE 3 Permissible Variations in Width
statisticalsamplingandinspectionofeachlotofwirepresented
Permissible Variations in Width in. for inspection in accordance with Specification B830.
Specified Width, in. (mm)
(mm), plus and minus
10.2 Conformance Criteria:
A
0.520 (12.5) and over 1 %
10.2.1 Failure of a specimen to conform to the applicable
Under 0.520 to 0.315 0.003 (0.076)
(12.5 to 8.00), incl
requirements of Section 6, 7, and 8 shall constitute failure of
Under 0.315 to 0.098 1%
the production unit from which the specimen was taken.
(8.00 to 2.50), incl
10.2.2 Any lot of wire that has been sampled in accordance
Under 0.098 to 0.063 0.001 (0.025)
(2.50 to 1.60), incl
with 10.1 and from which the number of specimens failing to
A
But not to exceed 0.016 in. (0.406 mm). comply with the requirements of Sections 6, 7, and 8 does not
equal or exceed the appropriate reject number of the sampling
table used shall be considered as complying with the require-
9. General Methods and Conditions
ments of Sections 6, 7, and 8.
10.2.3 Rejected lots may be screened to remove noncon-
9.1 Nominal Cross-Sectional Areas—Nominal cross-
forming production units by testing one specimen from each
sectional areas in square mils or square millimetres shall be
production unit in the lot for the failing characteristic.
calculated by subtracting the area reductions due to the
rounded corners or rounded edges (see Table 5 and Table 6).
11. Test Methods
Values so derived shall be rounded off in accordance with 9.4
11.1 Tensile Strength—The tensile strength, when tested in
to the same number of significant figures as used in expressing
accordance with Test Methods B557, shall be obtained by
the nominal dimensions, but in no case to less than three
dividing the maximum load carried by the specimen during the
significant figures.
tension test by the cross-sectional area of the specimen
9.2 Nominal Mass and Lengths—Nominal linear density
obtained in 9.1 (Explanatory Note 9).
and lengths shall be calculated from the nominal wire dimen-
11.1.1 If any part of the fracture takes place in the jaws of
sions in accordance with the following equations and shall be
the tensile machine, or if an examination indicates that there
rounded off in the final values only, in accordance with 9.4,to
was external damage, the value obtained may not be represen-
thesamenumberofsignificantfiguresasusedinexpressingthe
tative of the material. In such cases, the test may be discarded
nominal dimensions, but in no case less than three significant
and a new test made.
figures.
11.2 Resistivity—The electrical resistivity of the wire shall
Mass per Unit Length lb/ft 5 1.17 3A 310
be determined by resistance measurements in accordance with
kg/km 5 2.705 3A
1 Test Method B193 (Explanatory Note 2 and Table 7).
11.2.1 Nominalresistanceandothervaluesderivedfromthe
Length ft/lb 5 ~0.8547 310 !/A
resistivity units shall be calculated from the nominal wire
km/kg 5 ~0.36969!/A
dimensions in accordance with the following equations and all
where:
values so derived shall be rounded off in the final value only,
A = nominal cross-sectional area obtained in accordance in accordance with 9.4, to the same number of significant
with 9.1, mil , and figures as used in expressing the nominal dimensions, but in no
A = nominal cross-sectional area obtained in accordance
case to less than three significant figures.
with 9.1,mm . 11.2.1.1 All tempers except 1350-O:
d-c resistance at 20 °C,
9.3 Density—For the purpose of calculating linear density,
Ω/ft = 13.353 ⁄ A
(Note 2), cross sections, etc., the density of aluminum 1350
Ω/km = 28.264 ⁄ A
3 3
shall be taken as 0.0975 lb/in. (2705 kg/m)at20°C.
d-c resistance at 20 °C,
6 2
Ω/lb=(11.413×10 )/A
NOTE 2—The term mass per unit length is used in the standard as being
Ω/kg = 10.449 ⁄ A
technically correct, and it replaces the terms “weight” or “linear density.”
Length at 20 °C,
ft/Ω = 0.07489 × A
9.4 Rules for Rounding-Off—All calculations for the stan-
km/Ω = 0.03538 × A
dardnominaldimensionsandpropertiesshallberoundedinthe
Mass at 20 °C,
2 −6
lb/Ω = 0.087619 × A ×10
final value only, in accordance with the rounding method of
kc/Ω = 0.095703 × A
Practice E29.
11.2.1.2 1350-O:
9.5 Forthepurposeofthisspecification,allwiredimensions
d-c resistance at 20 °C,
and properties shall be considered as occurring at the interna-
Ω/ft = 13.181 ⁄A
tionally standardized reference temperature of 20 °C. When Ω/km = 27.898 ⁄A
d-c resistance at 20 °C,
measurements are made at temperatures other than this, cor-
6 2
Ω/lb=(11.266×10 )/A
rections shall be applied to bring the results to the reference 2
Ω/kg = 10.313 ⁄A
temperature. Length at 20 °C,
ft/Ω = 0.075867 × A
km/Ω = 0.03584 × A
10. Sampling Plan and Conformance Criteria 1
Mass at 20 °C,
2 −6
10.1 Sampling Plan—Determine the conformance of the lb/Ω = 0.088763 × A ×10
kg/Ω = 0.096965 × A
material to the requirements of Sections 6, 7, and 8 by
B324−01 (2021)
TABLE 4 Requirements for Rounded Corners and Rounded Edges
NOTE 1—Tabular size ranges given represent values in a preferred number series. Preferred numbers were recommended by the I
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