ASTM B416-98

Standard Specification for Concentric-Lay-Stranded Aluminum-Clad Steel Conductors

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.

General Information

• Status: Historical
• Publication Date: 09-Mar-1998
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.06 - Bi-Metallic Conductors

Relations

• Replaced By: ASTM B416-98(2002) - Standard Specification for Concentric-Lay-Stranded Aluminum-Clad Steel Conductors
• Effective Date: 10-Mar-1998

Standards Content (Sample)

Designation: B 416 – 98
Standard Specification for
Concentric-Lay-Stranded Aluminum-Clad Steel Conductors
This standard is issued under the fixed designation B 416; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4.1.1 Quantity of each size,
4.1.2 Conductor size expressed as number andAWG size of
1.1 This specification covers bare concentric-lay-stranded
individual wires (Section 3 and Table 1),
conductors made from bare, hard-drawn, round, aluminum-
4.1.3 Direction of lay of outer layer, if other than left-hand
clad steel wires of 20.3 % conductivity for general use of
(see 6.3),
electrical purposes. This specification does not apply to
4.1.4 Package size (see 15.1),
stranded conductors for reinforcement in ACSR conductors.
4.1.5 Special package markings if required (see 15.3),
1.2 The values stated in inch-pound units are to be regarded
4.1.6 Special lagging if required (see 15.2), and
as the standard. The values given in parentheses are for
4.1.7 Place of inspection if other than place of manufacture
information only.
(Section 13).
2. Referenced Documents
5. Joints
2.1 The following documents of the issue in effect on date
5.1 Joints or splices may be made in the finished individual
of material purchase form a part of this specification to the
aluminum-clad steel wires composing concentric-lay stranded
extent referenced herein:
conductors using more than three wires, provided that such
2.2 ASTM Standards:
joints or splices have a protection and electrical conductance
B 354 Terminology Relating to Uninsulated Metallic Elec-
equivalent to that of the wire itself and that they do not
trical Conductors
decrease the strength of the finished stranded conductor below
B 415 Specification for Hard-Drawn Aluminum-Clad Steel
the minimum breaking strength shown in Table 1. Such joints
Wire
orsplicesshallbenotcloserthan50ft(15m)toanyotherjoint
2.3 Other Documents:
in the same layer in the conductor.
C8.1 Definitions and General Standards for Wires and
Cables
NOTE 1—Joints are made by electrical butt-welding. The ends must be
NBS Handbook 100—Copper Wire Tables of the National 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
Institute of Standards and Technology
of the wires. The wires are then butt-welded and dressed off to a finished
diameter equal to that of the wire. The weld area is then tempered, the
3. Description of Conductor
sleeve centered over the weld area and compressed to provide a finished
3.1 The designation of the finished conductor shall be
jointthatissmoothandneatinappearance.Thisjointhasatensilestrength
expressed as the number of wires and the diameter of these
of approximately 90 % of rated breaking strength of the wire, but an
individual wires, usually expressed as the AWG size of the
allowance is made for this in the rated strength of the conductor as a
wires. whole. The completed conductor when containing such joints is required
to have the full rated strength.
4. Ordering Information
6. Lay
4.1 Orders for material under this specification shall include
6.1 For 3-wire conductors, the preferred lay is 16 ⁄2 times
the following information:
the outside diameter, but the lay shall not be less than 14 times
nor more than 20 times this diameter.
This specification is under the jurisdiction of ASTM Committee B-1 on
6.2 For 7, 19, and 37-wire conductors, the preferred lay is
Electrical Conductors and is the direct responsibility of Subcommittee B01.06 on
13 ⁄2 times the diameter of that layer, but the lay shall not be
Composite Conductors.
less than 10 nor more than 16 times this diameter.
CurrenteditionapprovedMarch10,1998.PublishedSeptember1998.Originally
published as B 416 – 64 T. Last previous edition B 416 – 93.
6.3 The direction of lay of the outer layer shall be left-hand
Annual Book of ASTM Standards, Vol 02.03.
unless the direction of lay is specified otherwise by the
Available from the American National Standards Institute, 11 West 42nd St.,
purchaser.
13th Floor, New York, NY 10036.
Available from the National Institute of Standards and Technology, (NIST),
Gaithersburg, MD 20899 .
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B 416–98
TABLE 1 Construction Requirements and Breaking Strength of NOTE 2—For definitions of terms relating to conductors, reference
A
Concentric-Lay Stranded Aluminum-Clad Steel Conductors
should be made to ANSI C8.1 and Terminology B 354.
Number and Diameter of
Rated 9. Physical and Electrical Tests
Individual Wires
Size Conductor Breaking
B
Nominal 9.1 Tests for physical and electrical properties of wires
Designation Diameter, Strength
Number Diameter, C D
in. min, lb
composing concentric-lay stranded conductors made from
in.
aluminum-clad steel wire shall be made before stranding.
37 No. 5 AWG 37 0.1819 1.27 142 800
9.2 At the option of the purchaser, tension and elongation
37 No. 6 AWG 37 0.1620 1.13 120 200
tests before stranding may be waived and the complete
37 No. 7 AWG 37 0.1443 1.01 100 700
37 No. 8 AWG 37 0.1285 0.899 84 200
conductorsmaybetestedasaunit.Thebreakingstrengthofthe
37 No. 9 AWG 37 0.1144 0.801 66 770
conductorssotestedshallbenotlessthanthatrequiredinTable
37 No. 10 AWG 37 0.1019 0.713 52 950
1.
19 No. 5 AWG 19 0.1819 0.910 73 350
19 No. 6 AWG 19 0.1620 0.810 61 700
9.3 Where breaking strength tests are required on the
19 No. 7 AWG 19 0.1443 0.721 51 730
finished conductor, they shall be made on representative
19 No. 8 AWG 19 0.1285 0.642 43 240
samplesnotlessthan4ft(1.25m)inlength.Forlotsof10 000
19 No. 9 AWG 19 0.1144 0.572 34 290
19 No. 10 AWG 19 0.1019 0.509 27 190
lb (4540 kg) or less, two samples shall be taken from separate
7 No. 5 AWG 7 0.1819 0.546 27 030
reels or coils in the lot except that but one sample shall be
7 No. 6 AWG 7 0.1620 0.486 22 730
required where the total amount of conductor is 5000 ft (1525
7 No. 7 AWG 7 0.1443 0.433 19 060
7 No. 8 AWG 7 0.1285 0.385 15 930
m) or less. For quantities over 10 000 lb, one sample for each
7 No. 9 AWG 7 0.1144 0.343 12 630
10 000 lb or fraction thereof, shall be taken, but the minimum
7 No. 10 AWG 7 0.1019 0.306 10 020
number of samples shall be three.
7 No. 11 AWG 7 0.0907 0.272 7 945
7 No. 12 AWG 7 0.0808 0.242 6 301
9.4 Specimens of the completed conductor shall be tested in
3 No. 5 AWG 3 0.1819 0.392 12 230
a tension testing machine equipped with jaws suitable for
3 No. 6 AWG 3 0.1620 0.349 10 280
3 No. 7 AWG 3 0.1443 0.311 8 621 gripping the conductor or equipped for holding properly
3 No. 8 AWG 3 0.1285 0.277 7 206
socketed specimens. Any test in which the result is below the
3 No. 9 AWG 3 0.1144 0.247 5 715
stated value, and which is obviously caused by improper
3 No. 10 AWG 3 0.1019 0.220 4 532
socketing of the specimen or due to the break occurring in or
A
For metric equivalents: Diameter (mm)—multiply diameter in inches by 25.4
at the gripping jaws of the machine, shall be disregarded and
(round to 4 significant figures).
Breaking Strength (kg)—multiply breaking strength in pounds by 0.45359 (round
another sample from the same coil or reel shall be tested.
to 4 significant figures).
B
The designation is a combination of the number of wires each of the AWG size
10. Density
indicated by“ No.”
C
Diameter of circumscribing circle. See Table 3 for complete table of properties. 10.1 Forthepurposeofcalculatingmassperunitlength(see
D
See Section 7.
Note 4), cross-sections, etc., the density of the aluminum-clad
3 3
steel wire shall be taken as 0.2381 lb/in. (6.590 g/cm ) at 20°C
(Note 3). Other constants are given in Table 2.
6.4 The direction of lay shall be reversed in consecutive
NOTE 3—The value of the density of aluminum-clad steel wire is an
layers.
average value which has been found to be in accordance with usual values
6.5 All wires in the conductor shall lie naturally in their true
encountered in practice.
positionsinthecompletedconductor.Theyshalltendtoremain
NOTE 4—The term mass per unit length is used in the specification as
in position when the conductor is cut at any point and shall
being more technically correct. It replaces the terms “weights” and “linear
density”.
permitrestrandingbyhandafterbeingforciblyunraveledatthe
end of the conductor.
11. Mass and Re
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