ASTM B416-98(2007)
(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 the standard. The values given in parentheses are for information only.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:B416 −98(Reapproved 2007)
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 the standard. The values given in parentheses are for
(see 6.3),
information only.
4.1.4 Package size (see 15.1),
4.1.5 Special package markings if required (see 15.3),
2. Referenced Documents
4.1.6 Special lagging if required (see 15.2), and
2.1 The following documents of the issue in effect on date
4.1.7 Place of inspection if other than place of manufacture
of material purchase form a part of this specification to the
(Section 13).
extent referenced herein:
2.2 ASTM Standards:
5. Joints
B354 Terminology Relating to Uninsulated Metallic Electri-
5.1 Joints or splices may be made in the finished individual
cal Conductors
aluminum-clad steel wires composing concentric-lay stranded
B415 Specification for Hard-Drawn Aluminum-Clad Steel
conductors using more than three wires, provided that such
Wire
joints or splices have a protection and electrical conductance
2.3 Other Documents:
equivalent to that of the wire itself and that they do not
C8.1 Definitions and General Standards for Wires and
decrease the strength of the finished stranded conductor below
Cables
the minimum breaking strength shown in Table 1. Such joints
NBSHandbook 100—Copper Wire Tables of the National
orsplicesshallbenotcloserthan50ft(15m)toanyotherjoint
Institute of Standards and Technology
in the same layer in the conductor.
3. Description of Conductor
NOTE 1—Joints are made by electrical butt-welding. The ends must be
cut and the end of each wire must be straightened for a distance of 12 to
3.1 The designation of the finished conductor shall be
15 in. (300 to 380 mm). The proper sleeve is slipped over the end of one
expressed as the number of wires and the diameter of these
of the wires. The wires are then butt-welded and dressed off to a finished
individual wires, usually expressed as the AWG size of the
diameter equal to that of the wire. The weld area is then tempered, 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.
Composite Conductors.
Current edition approved Oct. 1, 2007. Published October 2007. Originally
approved in 1964. Last previous edition approved in 2002 as B416 – 98 (2002).
6. Lay
DOI: 10.1520/B0416-98R07.
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.
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 (2007)
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
37 No. 7 AWG 37 0.1443 1.01 100 700
9. Physical and Electrical Tests
37 No. 8 AWG 37 0.1285 0.899 84 200
37 No. 9 AWG 37 0.1144 0.801 66 770 9.1 Tests for physical and electrical properties of wires
37 No. 10 AWG 37 0.1019 0.713 52 950
composing concentric-lay stranded conductors made from
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
19 No. 10 AWG 19 0.1019 0.509 27 190
conductorsmaybetestedasaunit.Thebreakingstrengthofthe
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
7 No. 10 AWG 7 0.1019 0.306 10 020 finished conductor, they shall be made on representative
7 No. 11 AWG 7 0.0907 0.272 7 945
samplesnotlessthan4ft(1.25m)inlength.Forlotsof10 000
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
3 No. 6 AWG 3 0.1620 0.349 10 280 reels or coils in the lot except that but one sample shall be
3 No. 7 AWG 3 0.1443 0.311 8 621
required where the total amount of conductor is 5000 ft (1525
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
3 No. 10 AWG 3 0.1019 0.220 4 532
10 000 lb or fraction thereof, shall be taken, but the minimum
A
number of samples shall be three.
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
to 4 significant figures). a tension testing machine equipped with jaws suitable for
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.”
C
socketed specimens. Any test in which the result is below the
Diameter of circumscribing circle. See Table 3 for complete table of properties.
D
See Section 7.
stated value, and which is obviously caused by improper
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.
6.3 The direction of lay of the outer layer shall be left-hand
10. Density
unless the direction of lay is specified otherwise by the
10.1 Forthepurposeofcalculatingmassperunitlength(see
purchaser.
Note 4), cross-sections, etc., the density of the aluminum-clad
3 3
6.4 The direction of lay shall be reversed in consecutive
steelwireshallbetakenas0.2381lb/in. (6.590g/cm )at20°C
layers.
(Note 3). Other constants are given in Table 2.
6.5 All wires in the conductor shall lie naturally in their true
NOTE 3—The value of the density of aluminum-clad steel wire is an
positionsinthecompletedconductor.Theyshalltendtoremain
average value which has been found to be in accordance with usual
...
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