ASTM B229-95
(Specification)Standard Specification for Concentric-Lay-Stranded Copper and Copper-Clad Steel Composite Conductors
Standard Specification for Concentric-Lay-Stranded Copper and Copper-Clad Steel Composite Conductors
SCOPE
1.1 This specification covers concentric-lay-stranded conductors made from uncoated hard-drawn round copper wires in combination with hard-drawn round copper-clad steel wires, for general use as overhead electrical conductors.
1.2 For the purpose of this specification, conductors are classified under the following type designations (see Fig 1): Type AType GType CType JType DType KType EType NType EKType PType FType V
1.3 The SI values for density are regarded as the standard. For all other properties the inch-pound values are to be regarded as standard and the SI units may be approximate.
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Designation: B 229 – 95
Standard Specification for
Concentric-Lay-Stranded Copper and Copper-Clad Steel
Composite Conductors
This standard is issued under the fixed designation B 229; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope
1.1 This specification covers concentric-lay-stranded con-
ductors made from uncoated hard-drawn round copper wires in
combination with hard-drawn round copper-clad steel wires,
for general use as overhead electrical conductors.
1.2 For the purpose of this specification, conductors are
classified under the following type designations (see Fig. 1):
Type A Type G
Type C Type J
Type D Type K
Type E Type N
Type EK Type P
Type F Type V
1.3 The SI values for density are regarded as the standard.
For all other properties the inch-pound values are to be
regarded as standard and the SI units may be approximate.
2. Referenced Documents
2.1 ASTM Standards:
B 1 Specification for Hard-Drawn Copper Wire
B 227 Specification for Hard-Drawn Copper-Clad Steel
Wire
B 354 Terminology Relating to Uninsulated Metallic Elec-
trical Conductors
2.2 ANSI Standard:
C 42 Definitions of Electrical Terms
2.3 National Institute of Standards and Technology:
4 FIG. 1 Standard Types of Composite Conductors
NBS Handbook 100—Copper Wire Tables
3. Ordering Information
3.1.2 Conductor size: hard-drawn copper equivalent in
circular-mil area or AWG (Section 7 and Table 1),
3.1 Orders for material under this specification shall include
3.1.3 Type (see 1.2, Fig. 1, and Table 1),
the following information:
3.1.4 Direction of lay of outer layer, if other than left-hand
3.1.1 Quantity of each size and type,
(see 6.3),
3.1.5 When physical tests shall be made (see section 7.2),
This specification is under the jurisdiction of ASTM Committee B-1 on 3.1.6 Package size (see 14.1),
Electrical Conductors and is the direct responsibility of Subcommittee B01.06 on
3.1.7 Special package marking, if required (Section 15),
Composite Conductors.
3.1.8 Lagging, if required (see 14.2), and
Current edition approved April 15, 1995. Published June 1995. Originally
3.1.9 Place of inspection (Section 13).
published as B 229 – 48 T. Last previous edition B 229 – 90.
Annual Book of ASTM Standards, Vol 02.03.
3.2 In addition, Supplementary Requirements shall apply
Available from American National Standards Institute, 11 W. 42nd St., 13th
only when specified by the purchaser in the inquiry, contract, or
Floor, New York, NY 10036.
4 purchase order for direct procurement by agencies of the U. S.
Available from the National Technical Information Service, 5285 Port Royal
Rd., Springfield, VA 22161. Government (S1, S2, and S3).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B 229
TABLE 1 Construction Requirements and Breaking Strength of Concentric-Lay-Stranded Copper and Copper-Clad Steel Composite
Conductors
NOTE 1—Metric Equivalents—For conductor size, 1 cmil = 0.0005067 mm (round to 4 significant figures); for diameter 1 mil = 0.02540 mm (round
to 4 significant figures); for breaking strength, 1 lb = 0.45359 kg (round to 4 significant figures).
Conductor Size, Hard-Drawn Copper Hard-Drawn Copper
Grade 30 EHS Copper-Clad Steel Wires
A
Rated Breaking
Equivalent Wires
Type Strength, min,
Number of Diameter of Number of Diameter of
lb
cmil AWG
Wires Wires, mils Wires Wires, mils
350 000 . E 7 157.6 12 157.6 32 420
350 000 . EK 4 147.0 15 147.0 23 850
350 000 . V 3 175.1 9 189.3 23 480
300 000 . E 7 145.9 12 145.9 27 770
300 000 . EK 4 136.1 15 136.1 20 960
300 000 . V 3 162.1 9 175.2 20 730
250 000 . E 7 133.2 12 133.2 23 920
250 000 . EK 4 124.2 15 124.2 17 840
250 000 . V 3 148.0 9 160.0 17 420
211 600 0000 E 7 122.5 12 122.5 20 730
211 600 0000 G 2 194.4 5 194.4 15 640
211 600 0000 EK 4 114.3 15 114.3 15 370
211 600 0000 V 3 136.1 9 147.2 15 000
211 600 0000 F 1 183.3 6 183.3 12 290
167 800 000 E 7 109.1 12 109.1 16 800
167 800 000 J 3 185.1 4 185.1 16 170
167 800 000 G 2 173.1 5 173.1 12 860
167 800 000 EK 4 101.8 15 101.8 12 370
167 800 000 V 3 121.2 9 131.1 12 200
167 800 000 F 1 163.2 6 163.2 9 980
133 100 00 K 4 178.0 3 178.0 17 600
133 100 00 J 3 164.8 4 164.8 13 430
133 100 00 G 2 154.2 5 154.2 10 510
133 100 00 V 3 108.0 9 116.7 9 846
133 100 00 F 1 145.4 6 145.4 8 094
105 600 0 K 4 158.5 3 158.5 14 490
105 600 0 J 3 146.7 4 146.7 10 970
105 600 0 G 2 137.3 5 137.3 8 563
105 600 0 F 1 129.4 6 129.4 6 536
83 690 1 N 5 154.6 2 154.6 15 410
83 690 1 K 4 141.2 3 141.2 11 900
83 690 1 J 3 130.7 4 130.7 9 000
83 690 1 G 2 122.2 5 122.2 6 956
83 690 1 F 1 115.3 6 115.3 5 266
66 360 2 P 6 154.0 1 154.0 16 870
66 360 2 N 5 137.7 2 137.7 12 680
66 360 2 K 4 125.7 3 125.7 9 730
66 360 2 J 3 116.4 4 116.4 7 322
66 360 2 A 1 169.9 2 169.9 5 876
66 360 2 G 2 108.9 5 108.9 5 626
66 360 2 F 1 102.6 6 102.6 4 233
52 620 3 P 6 137.1 1 137.1 13 910
52 620 3 N 5 122.6 2 122.6 10 390
52 620 3 K 4 112.0 3 112.0 7 910
52 620 3 J 3 103.6 4 103.6 5 955
52 620 3 A 1 151.3 2 151.3 4 810
41 740 4 P 6 122.1 1 122.1 11 420
41 740 4 N 5 109.2 2 109.2 8 460
41 740 4 D 2 161.5 1 161.5 7 340
41 740 4 A 1 134.7 2 134.7 3 938
33 090 5 P 6 108.7 1 108.7 9 311
33 090 5 D 2 143.8 1 143.8 6 035
33 090 5 A 1 120.0 2 120.0 3 193
26 240 6 D 2 128.1 1 128.1 4 942
26 240 6 A 1 106.8 2 106.8 2 585
B
26 240 6 C 1 104.6 2 104.6 2 143
B 229
TABLE 1 Continued
Conductor Size, Hard-Drawn Copper Hard-Drawn Copper
Grade 30 EHS Copper-Clad Steel Wires
A
Rated Breaking
Equivalent Wires
Type Strength, min,
Number of Diameter of Number of Diameter of
lb
cmil AWG
Wires Wires, mils Wires Wires, mils
20 820 7 D 2 114.1 1 114.1 4 022
20 820 7 A 1 126.6 2 89.5 2 754
16 510 8 D 2 101.6 1 101.6 3 256
16 510 8 A 1 112.7 2 79.7 2 233
B
16 510 8 C 1 80.8 2 83.4 1 362
B
11 750 9 ⁄2 D 2 80.8 1 80.8 1 743
A
See Explanatory Note 7.
B
Grade 40 HS.
4. Material for Wires 7. Construction
4.1 The purchaser shall designate the size and type of 7.1 The numbers and diameters of wires in the various types
conductor to be furnished. The position of the hard-drawn of concentric-lay-stranded composite conductors shall conform
copper wires and the copper-clad steel wires in the conductor to the requirements prescribed in Table 1 (Explanatory Note 2).
cross section shall be as shown in Fig. 1.
8. Physical and Electrical Tests
4.2 Before stranding, the wire used shall meet the require-
ments of Specifications B 1 and B 227 that are applicable to its 8.1 Tests for the physical and electrical properties of wires
composing concentric-lay-stranded composite conductors shall
type.
be made before but not after stranding.
5. Joints
8.2 At the option of the purchaser or his representative,
5.1 Copper—Welds and brazes may be made in copper rods
tension and elongation tests on wires before stranding may be
or in copper wires prior to final drawing. Joints may not be
waived, and the completed conductor may be tested as a unit.
made in the finished copper wires composing concentric-lay-
The breaking strength of the conductors so tested shall be not
stranded composite conductors containing a total of seven
less than the rated strength values shown in Table 2. The free
wires or less. In other conductors, welds and brazes may be
length between grips of the test specimen shall be not less than
made in the finished individual copper wires composing the
24 in. (0.61 m), and care shall be taken to ensure that the wires
conductor, but shall be not closer than 50 ft (15 m) to any other
in the conductor are evenly gripped during the test (Explana-
joint in the same layer in the conductor.
tory Note 3).
5.2 Copper-Clad Steel—Joints or splices may be made in
9. Density
the finished individual copper-clad steel wires composing
concentric-lay-stranded conductors, provided that such joints
9.1 For the purpose of calculating weights, cross sections,
or splices have a protection equivalent to that of the wire itself
etc., the density of the copper shall be taken as 8.89 g/cm at
and that they do not decrease the strength of the finished
20°C (Explanatory Note 4 and Table 2).
stranded conductor below the minimum breaking strength
9.2 The density of the copper-clad-steel wire shall be taken
shown in Table 1. Such joints or splices shall be not closer than
as 8.15 g/cm at 20°C (Explanatory Note 5 and Table 1).
50 ft (15 m) to any other joint in the same layer in the
10. Mass and Resistance
conductor (Explanatory Note 1).
10.1 The mass and electrical resistance of a unit length of
6. Lay
stranded conductor are a function of the length of lay. The
6.1 For Types A, C, and D conductors, the preferred lay is
approximate mass and electrical resistance may be determined
approximately 16.5 times the outside diameter of the com-
using the standard increments shown in Table 3. When greater
pleted conductor, but shall be not less than 13 nor more than 20
accuracy is desired, the increment based on the specific lay of
times this diameter.
the conductor may be calculated (Explanatory Note 6). Refer-
6.2 For all other types, the preferred lay of a layer of wires
ence information is shown in Table 4.
is 13.5 times the outside diameter of that layer, but shall benot
less than 10 nor more than 16 times this diameter. 11. Variation in Area
6.3 The direction of lay of the outer layer shall be left-hand
11.1 The area of cross section of the completed conductor
unless the direction of lay is specified otherwise by the
shall be not less than 98 % of the nominal area. The area of
purchaser.
6.4 The direction of lay shall be reversed in successive
TABLE 2 Density of Copper and Copper-Clad Steel
layers.
Density at 20°C
6.5 All wires in the conductor shall lie naturally in their true
Units Copper-Clad
Copper
positions in the completed conductor. They shall tend to remain Steel
Grams per cubic centimetre 8.89 8.15
in position when the conductor is cut at any point and shall
Pounds per cubic inch 0.32117 0.29444
permit restranding by hand after being forcibly unraveled at the
Pounds per circular mil-foot 0.0000030270 0.0000027750
end of the conductor.
B 229
TABLE 3 Standard Increments Due to Stranding
accordance with this specification.
Increment (Increase) of
Type of Conductor
Resistance and Weight, %
14. Packaging and Shipping
A, C and D 0.8
14.1 Package sizes for conductors shall be agreed upon by
F, G, J, K, N and P 1.0
the manufacturer and the purchaser in the placing of individual
V 1.2
E and EK 1.4 orders (Explanatory Note 9).
14.2 The conductors shall be protected against damage in
ordinary handling and shipping. If heavy wood lagging is
cross section of a conductor shall be considered to be the sum
required, it shall be specified by the purchaser at the time of
of the cross-sectional areas of its component wires at any point
purchase.
when measured perpendicularly to their axes (Explanatory
Note 8).
15. Marking
12. Finish
15.1 The net mass, length (or lengths, and number of
lengths, if more than one length is included in the package),
12.1 The conductor shall be free of all imperfections not
size, type of conductor, purchase order number, and any other
consistent with the best commercial practice.
marks required by the purchase order shall be marked on a tag
13. Inspection
attached to the end of the conductor inside of the package. The
same information, together with the manufacturer’s serial
13.1 Unless otherwise specified in the contract or purchase
number (if any) and all shipping marks required by the
order, the manufacturer shall be responsible for the perfor-
purchaser, shall appear on the outside of each package.
mance of all inspection and test requirements specified.
13.2 All inspections and tests shall be made at the place of
16. Keywords
manufacture unless otherwise especially agreed to between the
manufacturer and the purchaser at the time of the purchase. 16.1 composite conductors; concentric-lay-stranded copper
13.3 The manufacturer shall afford the inspector represent- conductor; copper-clad steel conductor; copper electrical con-
ing the purchaser all reasonable manufacturer’s facilities nec- ductor; electrical conductor; electrical conductor—copper;
essary to ensure that the material is being furnished in stranded copper conductor
EXPLANATORY NOTES
NOTE 1—Joints or splices in individual copper-clad steel wires in their specimen. Various means are available, such as a long tube or socket into
finished size are made by electrical butt welding. Two types of joints are which the conductor may be soldered, or in which, after insertion, the
used and are described as follows: conductors may be swaged or pressed without serious distortion. Ordinary
(a) Weld-Annealed Joints—After butt welding, the wire is annealed for jaws or clamping devices usually are not suitable. The conductor testing
a distance of approximately 5 in. (127 mm) on each side of the weld. The facilities of many commercial laboratories are limited to a breaking
weld then is protected from corrosion with a snug fitting seamless copper strength of 30 000 lb (13.6 Mg) or less. Consequently, it may not be
sleeve which extends at least ⁄8 in. (9.5 mm) on each side of the weld and feasible to test the very large-sized conductors as a unit. Where such is
which is thoroughly sealed to the wire with solder. The wall thickness of imperative, special arrangements for the testing shall be agreed upon
the sleeve is at least 10 % of the radius of the wire. between the manufacturer and the purchaser.
This joint has a tensile strength of approximately 60 000 psi (415 MPa).
NOTE 4—The value of density of copper is in accordance with the
This is less than the strength of the individual wires, but an allowance is
International Annealed Copper Standard. As pointed out in the discussion
made for this in the rated strength of the conductor as a whole. The
of this subject in NBS Handbook 100 of the National Institute of Standards
completed conductor when containing such joints is required to have the
and Technology, there is no appreciable difference in values of density of
full rated strength.
hard-drawn and annealed copper wire. Equivalent expressions of density
This type of joint is only slightly larger than the wire itself and is
at 20°C are given in Table 3.
applicable for 7-wire composite conductors (except Types F and G) and
NOTE 5—The value of density of coppe
...
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