ASTM B416-98(2013)
(Specification)Standard Specification for Concentric-Lay-Stranded Aluminum-Clad Steel Conductors
Standard Specification for Concentric-Lay-Stranded Aluminum-Clad Steel Conductors
ABSTRACT
This specification covers bare concentric-lay-stranded conductors made from bare, hard-drawn, round, aluminum-clad steel wires for generail use of electrical purposes. This specification does not apply to stranded conductors for reinforcement in ACSR conductors. The conductors shall conform to the required values of breaking strength, nominal diameter and number of individual wires, conductor diameter, mass per unit length and electrical resistance.. Physical and electrical tests shall be performed on the wires before stranding.
SCOPE
1.1 This specification covers bare concentric-lay-stranded conductors made from bare, hard-drawn, round, aluminum-clad steel wires of 20.3 % conductivity for general use of electrical purposes. This specification does not apply to stranded conductors for reinforcement in ACSR conductors.
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:B416 −98 (Reapproved 2013)
Standard Specification for
Concentric-Lay-Stranded Aluminum-Clad Steel Conductors
This standard is issued under the fixed designation B416; 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 4. Ordering Information
1.1 This specification covers bare concentric-lay-stranded
4.1 Orders for material under this specification shall include
conductors made from bare, hard-drawn, round, aluminum-
the following information:
clad steel wires of 20.3 % conductivity for general use of
4.1.1 Quantity of each size,
electrical purposes. This specification does not apply to
4.1.2 Conductor size expressed as number andAWG size of
stranded conductors for reinforcement in ACSR conductors.
individual wires (Section 3 and Table 1),
1.2 The values stated in inch-pound units are to be regarded
4.1.3 Direction of lay of outer layer, if other than left-hand
as standard. The values given in parentheses are mathematical
(see 6.3),
conversions to SI units that are provided for information only
4.1.4 Package size (see 15.1),
and are not considered standard.
4.1.5 Special package markings if required (see 15.3),
4.1.6 Special lagging if required (see 15.2), and
2. Referenced Documents
4.1.7 Place of inspection if other than place of manufacture
2.1 The following documents of the issue in effect on date
(Section 13).
of material purchase form a part of this specification to the
extent referenced herein:
5. Joints
2.2 ASTM Standards:
5.1 Joints or splices may be made in the finished individual
B354 Terminology Relating to Uninsulated Metallic Electri-
aluminum-clad steel wires composing concentric-lay stranded
cal Conductors
conductors using more than three wires, provided that such
B415 Specification for Hard-Drawn Aluminum-Clad Steel
joints or splices have a protection and electrical conductance
Wire
equivalent to that of the wire itself and that they do not
2.3 Other Documents:
decrease the strength of the finished stranded conductor below
C8.1 Definitions and General Standards for Wires and
3 the minimum breaking strength shown in Table 1. Such joints
Cables
orsplicesshallbenotcloserthan50ft(15m)toanyotherjoint
NBSHandbook 100—Copper Wire Tables of the National
4 in the same layer in the conductor.
Institute of Standards and Technology
NOTE 1—Joints are made by electrical butt-welding. The ends must be
3. Description of Conductor
cut and the end of each wire must be straightened for a distance of 12 to
15 in. (300 to 380 mm). The proper sleeve is slipped over the end of one
3.1 The designation of the finished conductor shall be
of the wires. The wires are then butt-welded and dressed off to a finished
expressed as the number of wires and the diameter of these
diameter equal to that of the wire. The weld area is then tempered, the
individual wires, usually expressed as the AWG size of the
sleeve centered over the weld area and compressed to provide a finished
wires.
jointthatissmoothandneatinappearance.Thisjointhasatensilestrength
of approximately 90 % of rated breaking strength of the wire, but an
allowance is made for this in the rated strength of the conductor as a
This specification is under the jurisdiction of ASTM Committee B01 on
whole. The completed conductor when containing such joints is required
Electrical Conductors and is the direct responsibility of Subcommittee B01.06 on
to have the full rated strength.
Bi-Metallic Conductors.
Current edition approved April 1, 2013. Published April 2013. Originally
approved in 1964. Last previous edition approved in 2007 as B416 – 98 (2007).
6. Lay
DOI: 10.1520/B0416-98R13.
2 1
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.1 For 3-wire conductors, the preferred lay is 16 ⁄2 times
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
the outside diameter, but the lay shall not be less than 14 times
Standards volume information, refer to the standard’s Document Summary page on
nor more than 20 times this diameter.
the ASTM website.
Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
6.2 For 7, 19, and 37-wire conductors, the preferred lay is
4th Floor, New York, NY 10036, http://www.ansi.org.
4 13 ⁄2 times the diameter of that layer, but the lay shall not be
Available from National Institute of Standards and Technology (NIST), 100
Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov. less than 10 nor more than 16 times this diameter.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B416−98 (2013)
TABLE 1 Construction Requirements and Breaking Strength of
8. Construction
A
Concentric-Lay Stranded Aluminum-Clad Steel Conductors
8.1 The number and diameter of the wires in the concentric-
Number and Diameter of
Rated
lay stranded conductors shall conform to the requirements
Individual Wires
Size Conductor Breaking
prescribed in Table 1.
B Nominal
Designation Diameter, Strength
Number Diameter, C D
in. min, lb
NOTE 2—For definitions of terms relating to conductors, reference
in.
should be made to ANSI C8.1 and Terminology B354.
37 No. 5 AWG 37 0.1819 1.27 142 800
37 No. 6 AWG 37 0.1620 1.13 120 200
9. Physical and Electrical Tests
37 No. 7 AWG 37 0.1443 1.01 100 700
37 No. 8 AWG 37 0.1285 0.899 84 200
9.1 Tests for physical and electrical properties of wires
37 No. 9 AWG 37 0.1144 0.801 66 770
composing concentric-lay stranded conductors made from
37 No. 10 AWG 37 0.1019 0.713 52 950
19 No. 5 AWG 19 0.1819 0.910 73 350
aluminum-clad steel wire shall be made before stranding.
19 No. 6 AWG 19 0.1620 0.810 61 700
19 No. 7 AWG 19 0.1443 0.721 51 730 9.2 At the option of the purchaser, tension and elongation
19 No. 8 AWG 19 0.1285 0.642 43 240
tests before stranding may be waived and the complete
19 No. 9 AWG 19 0.1144 0.572 34 290
conductorsmaybetestedasaunit.Thebreakingstrengthofthe
19 No. 10 AWG 19 0.1019 0.509 27 190
7 No. 5 AWG 7 0.1819 0.546 27 030 conductorssotestedshallbenotlessthanthatrequiredinTable
7 No. 6 AWG 7 0.1620 0.486 22 730
1.
7 No. 7 AWG 7 0.1443 0.433 19 060
7 No. 8 AWG 7 0.1285 0.385 15 930
9.3 Where breaking strength tests are required on the
7 No. 9 AWG 7 0.1144 0.343 12 630
finished conductor, they shall be made on representative
7 No. 10 AWG 7 0.1019 0.306 10 020
samplesnotlessthan4ft(1.25m)inlength.Forlotsof10 000
7 No. 11 AWG 7 0.0907 0.272 7 945
7 No. 12 AWG 7 0.0808 0.242 6 301
lb (4540 kg) or less, two samples shall be taken from separate
3 No. 5 AWG 3 0.1819 0.392 12 230
reels or coils in the lot except that but one sample shall be
3 No. 6 AWG 3 0.1620 0.349 10 280
required where the total amount of conductor is 5000 ft (1525
3 No. 7 AWG 3 0.1443 0.311 8 621
3 No. 8 AWG 3 0.1285 0.277 7 206
m) or less. For quantities over 10 000 lb, one sample for each
3 No. 9 AWG 3 0.1144 0.247 5 715
10 000 lb or fraction thereof, shall be taken, but the minimum
3 No. 10 AWG 3 0.1019 0.220 4 532
number of samples shall be three.
A
For metric equivalents: Diameter (mm)—multiply diameter in inches by 25.4
(round to 4 significant figures).
9.4 Specimens of the completed conductor shall be tested in
Breaking Strength (kg)—multiply breaking strength in pounds by 0.45359 (round
a tension testing machine equipped with jaws suitable for
to 4 significant figures).
B
The designation is a combination of the number of wires each of the AWG size gripping the conductor or equipped for holding properly
indicated by “No.”
socketed specimens. Any test in which the result is below the
C
Diameter of circumscribing circle. See Table 3 for complete table of properties.
D stated value, and which is obviously caused by improper
See Section 7.
socketing of the specimen or due to the break occurring in or
at the gripping jaws of the machine, shall be disregarded and
another sample from the same coil or reel shall be tested.
10. Density
6.3 The direction of lay of the outer layer shall be left-hand
10.1 Forthepurposeofcalculatingmassperunitlength(see
unless the direction of lay is specified otherwise by the
Note 4), cross-sections, etc., the density of the aluminum-clad
purchaser.
3 3
steelwireshallbetakenas0.2381lb/in. (6.590g/cm )at20°C
6.4 The direction of lay shall be reversed in consecutive
(Note 3). Other constants are given in Table 2.
layers.
NOTE 3—The value of the density of aluminum-clad steel wire is an
6.5 All wires in the conductor shall lie naturally in their true
average value which has been found to be in accordance with usual values
positionsinthecompletedconductor.Theyshallt
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