ASTM B401-04(2010)

Standard Specification for Compact Round Concentric-Lay-Stranded Aluminum Conductors, Steel-Reinforced (ACSR/COMP)

ABSTRACT
This specification covers compact round concentric-lay stranded conductors made from aluminum 1350-H19 (extra hard) wires and round zinc-coated, aluminum-coated, or aluminum-clad steel core wires usually used in overhead lines. Compact ACSR covered by this specification has five types of steel core wire which are designated by ACSR/GA/COMP, ACSR/GB/COMP, ACSR/GC/COMP, ACSR/AZ/COMP, ACSR/AW/COMP. Electric-butt welds, electric-butt, cold-upset welds, or cold-pressure welds in the individual round-drawn or shaped aluminum wires shall be made during the stranding process. The preferred lay of the aluminum wires of aluminum conductors, steel-reinforced, having a single wire steel core and one layer of aluminum wires shall be 14 times the outside diameter of the conductor but the lay shall be not less than 13 nor more than 16 times that diameter. The diameter of the steel core wire, the number of aluminum wires, the aluminum cross-sectional area, the diameter and weight of the compact round concentric-lay-stranded aluminum conductors, steel-reinforced, shall conform to the construction requirements. The rated strength of a completed conductor shall be taken as the aggregate strength of the aluminum and steel components, and shall be calculated according to the prescribed computation. The mass and electrical resistance of a unit length of stranded conductor shall be a function of the length of lay. Tests for mechanical and electrical properties of aluminum wires composing the conductors shall be made before stranding.
SCOPE
1.1 This specification covers compact round concentric-lay-stranded conductors made from aluminum 1350-H19 (extra hard) wires and round zinc-coated, aluminum-coated, or aluminum-clad steel core wires usually used in overhead lines. These conductors shall be constructed with one steel core wire surrounded by one or more layers of helically-laid compacted or otherwise shaped aluminum wires (Explanatory Note 1 and Note 2).
1.2 Compact ACSR covered by this specification has five types of steel core wire which are designated by abbreviations as follows (Explanatory Note 2).
1.2.1 ACSR/GA/COMP—Compact ACSR using Class A zinc-coated steel wire,
1.2.2 ACSR/GB/COMP—Compact ACSR using Class B zinc-coated steel wire,
1.2.3 ACSR/GC/COMP—Compact ACSR using Class C zinc-coated steel wire,
1.2.4 ACSR/AZ/COMP—Compact ACSR using aluminum-coated (aluminized) steel wire, and
1.2.5 ACSR/AW/COMP—Compact ACSR using aluminum-clad steel wire.
1.3 The SI values of density and resistivity are to be regarded as standard. For all other properties the inch-pound values are to be regarded as standard and the SI units may be approximate.
Note 1—Prior to 1975, aluminum 1350 was designated as EC aluminum.
Note 2—The aluminum and temper designations conform to ANSI H35.1. Aluminum 1350 corresponds to Unified Numbering System A91350 in accordance with Practice E527.

General Information

• Status: Historical
• Publication Date: 30-Sep-2010
• ICS: 29.060.20 - Cables
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.07 - Conductors of Light Metals

Relations

• Replaces: ASTM B401-04 - Standard Specification for Compact Round Concentric-Lay-Stranded Aluminum Conductors, Steel-Reinforced (ACSR/COMP)
• Effective Date: 01-Oct-2010
• Replaced By: ASTM B401-12 - Standard Specification for Compact Round Concentric-Lay-Stranded Aluminum Conductors, Steel-Reinforced (ACSR/COMP)
• Effective Date: 15-Oct-2012
• Referred By: ASTM B1006-17 - Standard Specification for Electrical Overhead Conductor Code Word Names
• Effective Date: 01-Oct-2010

Standards Content (Sample)

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: B401 −04(Reapproved 2010)
Standard Specification for
Compact Round Concentric-Lay-Stranded Aluminum
Conductors, Steel-Reinforced (ACSR/COMP)
This standard is issued under the fixed designation B401; 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 compact round concentric-lay-
Materials
stranded conductors made from aluminum 1350-H19 (extra
B230/B230M Specification for Aluminum 1350–H19 Wire
hard) wires and round zinc-coated, aluminum-coated, or
for Electrical Purposes
aluminum-clad steel core wires usually used in overhead lines.
B232/B232M Specification for Concentric-Lay-Stranded
These conductors shall be constructed with one steel core wire
Aluminum Conductors, Coated-Steel Reinforced (ACSR)
surrounded by one or more layers of helically-laid compacted
B263 Test Method for Determination of Cross-Sectional
or otherwise shaped aluminum wires (Explanatory Note 1 and
Area of Stranded Conductors
Note 2).
B341/B341M Specification for Aluminum-Coated (Alumi-
1.2 Compact ACSR covered by this specification has five
nized) Steel Core Wire for Aluminum Conductors, Steel
types of steel core wire which are designated by abbreviations 3
Reinforced (ACSR/AZ) (Withdrawn 2007)
as follows (Explanatory Note 2).
B354 Terminology Relating to Uninsulated Metallic Electri-
1.2.1 ACSR/GA/COMP—Compact ACSR using Class A
cal Conductors
zinc-coated steel wire,
B498/B498M Specification for Zinc-Coated (Galvanized)
1.2.2 ACSR/GB/COMP—Compact ACSR using Class B
Steel Core Wire for Use in Overhead Electrical Conduc-
zinc-coated steel wire,
tors
1.2.3 ACSR/GC/COMP—Compact ACSR using Class C
B502 Specification for Aluminum-Clad Steel Core Wire for
zinc-coated steel wire,
Use in Overhead Electrical Aluminum Conductors
1.2.4 ACSR/AZ/COMP—Compact ACSR using aluminum-
B802M Specification for Zinc-5% Aluminum-Mischmetal
coated (aluminized) steel wire, and
Alloy-Coated Steel Core Wire forAluminum Conductors,
1.2.5 ACSR/AW/COMP—Compact ACSR using aluminum-
Steel Reinforced (ACSR)[Metric](Discontinued 1998-
clad steel wire.
Replaced by B 802/B802M) (Withdrawn 1998)
1.3 The SI values of density and resistivity are to be
E29 Practice for Using Significant Digits in Test Data to
regarded as standard. For all other properties the inch-pound
Determine Conformance with Specifications
values are to be regarded as standard and the SI units may be
E527 Practice for Numbering Metals and Alloys in the
approximate.
Unified Numbering System (UNS)
NOTE 1—Prior to 1975, aluminum 1350 was designated as EC
2.3 Other Documents:
aluminum.
ANSI H35.1, American National Standard Alloy and Tem-
NOTE 2—The aluminum and temper designations conform to ANSI 4
per Designation Systems For Aluminum
H35.1. Aluminum 1350 corresponds to Unified Numbering System
NBS Handbook 100—Copper Wire Tables of the National
A91350 in accordance with Practice E527.
Bureau of Standards
2. Referenced Documents
2.1 The following documents of the issue in effect on date
of material purchase form a part of this specification to the 2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
extent referenced herein.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
1 3
This specification is under the jurisdiction of ASTM Committee B01 on The last approved version of this historical standard is referenced on
Electrical Conductors and is the direct responsibility of Subcommittee B01.07 on www.astm.org.
Conductors of Light Metals. Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
Current edition approved Oct. 1, 2010. Published December 2010. Originally 4th Floor, New York, NY 10036.
approved in 1963. Last previous edition approved in 2004 as B401 – 04. DOI: Available from National Technical Information Service (NTIS), U.S. Depart-
10.1520/B0401-04R10. ment of Commerce, 5285 Port Royal Rd., Springfield, VA 22161.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B401 − 04 (2010)
3. Ordering Information 5.5 The direction of lay shall be reversed in successive
layers.
3.1 Orders for material under this specification shall include
the following information:
6. Construction
3.1.1 Quantity of each size and stranding (Table 1),
6.1 The diameter of the steel core wire, the number of
3.1.2 Conductor size: circular-mil area or AWG (Section 6,
aluminum wires, the aluminum cross-sectional area, the diam-
and Table 1),
eter and weight of the compact round concentric-lay-stranded
3.1.3 Steel wire coating or aluminum-clad (see 11.3),
aluminum conductors, steel-reinforced, shall be as shown in
3.1.4 Special tension test, if required (see 15.3),
Table 1.
3.1.5 Place of inspection (Section 16), and
3.1.6 Packaging and Package Marking (Section 17).
7. Rated Strength of Conductor
7.1 The rated strength of a completed conductor shall be
4. Joints
taken as the aggregate strength of the aluminum and steel
4.1 Electric-butt welds, electric-butt, cold-upset welds, or
components, calculated as follows: The strength contribution
cold-pressure welds in the individual round-drawn or shaped
of the aluminum wires shall be taken as the percentage,
aluminumwiresmaybemadeduringthestrandingprocess.No
accordingtothenumberoflayersofaluminumwires,indicated
weld shall occur within 50 ft (15 m) of a weld in the same wire
in Table 2, of the sum of the strengths of the 1350-H19 wires,
or in any other wire of the completed conductor.
calculated on the basis of the nominal wire diameter for the
4.2 There shall be no joints of any kind made in the finished
corresponding noncompacted construction given in Specifica-
coated, or aluminum-clad steel wires.
tion B232/B232M and the appropriate specified minimum
average tensile strength given in Specification B230/B230M.
5. Lay
The strength contribution of the steel core shall be taken as
96 % of the strength of the steel wire calculated from its
5.1 The preferred lay of the aluminum wires of aluminum
conductors, steel-reinforced, having a single wire steel core specified nominal diameter and the appropriate specified mini-
mum stress at 1 % extension given in Specification B341/
and one layer of aluminum wires is 14 times the outside
diameter of the conductor but the lay shall be not less than 13 B341M, B498/B498M, B502,or B802M, whichever is appli-
cable.
nor more than 16 times that diameter.
5.2 Thepreferredlayoftheoutsidelayerofaluminumwires 7.2 Rated strength and breaking strength values shall be
rounded to three significant figures, in the final value only, in
of aluminum conductors, steel-reinforced, having multiple
accordance with Practice E29.
layers of aluminum wires is 12 times the outside diameter of
the conductor but the lay shall be not less than 11 nor more
7.3 Rated strength of conductors are given in Table 3.
than 14 times that diameter.
8. Density
5.3 The preferred lay of the layer immediately beneath the
outside layer of aluminum wires of aluminum conductors, 8.1 For the purpose of calculating mass, mass per unit
steel-reinforced, having multiple layers of aluminum wires is length, cross sections, and so forth, the density of aluminum
3 3
14 times the outside diameter of such layer but the lay shall be 1350 shall be taken as 2705 kg/m (0.0975 lb/in. ) at 20°C.
not less than 11 nor more than 17.5 times that diameter.
8.2 For the purpose of calculating mass, mass per unit
5.4 The direction of lay of the outside layer of aluminum length, cross sections, and so forth, the density of coated steel
3 3
wires shall be right hand. wire shall be taken as 7780 kg/m (0.281 lb/in. ) at 20°C.
TABLE 1 Construction Requirements for Compact Round Concentric-Lay-Stranded Aluminum Conductors, Steel Reinforced
Required Construction Nominal Mass for Conductors With:
Compact
Conductor Size Steel Wire Coated Steel Aluminum-Clad
Number of
Conductor
(Aluminum Wires) Diameter Core Wire Steel Core Wire
Aluminum
Diameter
Wires
cmil mm AWG in. mm in. mm lb/1000 ft kg/km lb/1000 ft kg/km
336 400 170.2 . 18 0.1367 3.47 0.628 15.95 364.8 543.3 357.2 531.1
266 800 135.0 . 18 0.1217 3.09 0.559 14.20 289.1 430.8 283.1 421.1
211 600 107.2 0000 6 0.1878 4.77 0.517 13.13 290.8 433.4 276.5 412.1
167 800 85.1 000 6 0.1672 4.25 0.461 11.71 230.5 343.9.0 219.2 327.1
133 100 67.3 00 6 0.1489 3.78 0.410 10.41 182.8 272.3 173.8 258.9
105 600 53.5 0 6 0.1327 3.37 0.365 9.27 145.2 216.4 138.1 205.8
83 690 42.4 1 6 0.1181 3.00 0.326 8.28 115.0 171.4 109.4 163.0
66 360 33.6 2 7 0.1299 3.30 0.298 7.57 106.6 158.6 99.8 148.4
66 360 33.6 2 6 0.1052 2.67 0.290 7.37 91.2 135.9 86.8 129.2
52 620 26.7 3 6 0.0937 2.38 0.258 6.55 72.4 107.9 68.8 102.6
41 740 21.1 4 7 0.1029 2.61 0.236 5.99 67.0 99.7 62.7 93.4
41 740 21.2 4 6 0.0834 2.12 0.229 5.82 57.3 85.6 54.5 81.4
26 240 13.3 6 6 0.0661 1.68 0.182 4.62 36.0 53.7 . .
B401 − 04 (2010)
TABLE 2 Strength Rating Factors
12. Variation in Area
Stranding Rating Factor, %
12.1 The cross-sectional area of the aluminum in wires of a
Number of Wires Number of Layers
Aluminum Steel
compact round ACSR shall be not less than 98 % of the
Aluminum Steel Aluminum Steel
A
61 1 96 96
cross-sectional area as specified in column 1 of Table 1. The
A
71 1 96 96
manufacturer shall determine the cross-sectional area by Test
A
18 1 2 93 96
Method B263. In applying this method, the increment in
A
Centralsteelwireonly:the96 %RatingFactorisappliedtothesinglesteelwire
weight resulting from stranding may be the applicable value
core in the event it contains a weld (made prior to drawing).
specified in 9.1 or may be calculated from the measured
dimensions of the sample under test. In case of question
regarding area compliance, the actual mass increment due to
stranding shall be calculated.
8.3 For the purpose of calculating mass, mass per unit
13. Variation in Diameter
length, cross sections, and so forth, the density of aluminum-
3 3
clad steel wire shall be taken as 6590 kg/m (0.2381 lb/in.)at
13.1 The diameter of the compact round ACSR shall vary
20°C.
by not more than +1–2 % from the diameter specified in Table
1.
9. Mass and Electrical Resistance
14. Sampling
9.1 The mass and electrical resistance of a unit length of
stranded conductor are a function of the length of lay. The 14.1 The aluminum cross-sectional area (Section 12) and
the conductor diameter (Section 13) shall be measured on a
approximate mass and electrical resistance may be determined
using an increment of 1.5 % for conductors composed of 1 sample of completed conductor. At least one sample shall be
tested for each size of conductor on each order of quantities
steel and 6 or 7 aluminum wires and an increment of 2 % for
from 5000 to 100 000 ft (1500 to 30 000 m) and one
conductors composed of 1 steel and 18 aluminum wires.When
additional sample tested from each 100 000 ft thereafter.
greater accuracy is desired, the increment based on the specific
lay of the conductor may be calculated (Explanatory Note 4).
15. Mechanical and Electrical Tests
9.2 In the calculation of the electrical resistance of a
15.1 Tests for mechanical and electrical properties of alu-
completed conductor, coated steel wires may be included.
minum wires composing the conductors shall be made before
9.3 The maximum electrical resistance of a unit length of
stranding (Explanatory Note 5).
stranded conductor shall not exceed 102 % of the nominal dc
15.2 Testsforthemechanicalandelectricalpropertiesofthe
resistanceshowninTable4(ExplanatoryNote6).Whenthedc
steel core wire shall be made before, but not after stranding,
resistance is measured at other than 20°C, it is to be corrected
unless otherwise agreed by the manufacturer and the purchaser
by using the multiplying factor given in Table 5.
as provided in 15.3 (Explanatory Note 5).
9.4 For conductors to be used in covered or insulated wires
15.3 At the option of the purchaser, at the time of placing
orcablesdcresistancemeasurementsmaybeusedinlieuofthe
the order, tension and elongation tests of wire before stranding
method outlined in Section 12.
may be waived, and the completed conductor may be tested as
a unit. The minimum breaking strength of conductors so tested
10. Workmanship, Finish, and Appearance
shall be not less than the rated strength if failure occurs in the
10.1 The conductor shall be clean and free of imperfections
free length at least 1 in. (25 mm) beyond the end of either
not consistent with good commercial practice.
gripping device, or shall be not less than 95 % of the rated
strength if failure occurs inside, or within 1 in. of the end of,
11. Requirements for Wires
eithergrippingdevice.Thefreelengthbetweengripsofthetest
11.1 Before stranding and compacting, the round aluminum specimen shall be not less than 24 in. (600 mm), and care shall
wire used shall conform to the requirements of Specification be taken to ensure that the wires in the conductor are evenly
B230/B230M. gripped during the test (Explanatory Note 3).
11.2 Aluminum wires shaped before stranding shall meet
16. Inspection
the requirements of Specification B230/B230M, except for
16.1 Unless otherwise specified in the contract or purchase
shape, tensile and elongation requirements, and diameter
order, the manufacturer shall be responsible for the perfor-
tolerances. The minimum tensile and elongation requirements
mance of all inspection and test requirements specified.
shall be 96 % of those for round wires of the same nominal
area, provided the completed conductor is capable of meeting 16.2 All inspections and tests shall be made at the place of
the requirements of Section 7. The area tolerances for the manufacture unless otherwise agreed to between the manufac-
shaped wires shall be such that the finished conductor con- turer and the purchaser at the time of purchase.
forms to Section 12.
16.3 The manufacturer shall afford the inspector represent-
11.3 Before stranding, the steel core wire used shall con- ing the purchaser all reasonable manufacturer’s facilities to
form to the requirements of Specification B341/B341M, B498/ satisfy him that the material is being furnished in accordance
B498M, B502,or B802M, whichever is applicable. with this specification.
B401 − 04 (2010)
TABLE 3 Rated Strengths for Compact Round Concentric-Lay-Stran
...

This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B401 – 04
Standard Specification for
Compact Round Concentric-Lay-Stranded Aluminum
Conductors, Steel-Reinforced (ACSR/COMP)
This standard is issued under the fixed designation B401; 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
1.1 This specification covers compact round concentric-lay-stranded conductors made from aluminum 1350-H19 (extra hard)
wires and round zinc-coated, aluminum-coated, or aluminum-clad steel core wires usually used in overhead lines. These
conductorsshallbeconstructedwithonesteelcorewiresurroundedbyoneormorelayersofhelically-laidcompactedorotherwise
shaped aluminum wires (Explanatory Note 1 and Note 2).
1.2 Compact ACSR covered by this specification has five types of steel core wire which are designated by abbreviations as
follows (Explanatory Note 2).
1.2.1 ACSR/GA/COMP—Compact ACSR using Class A zinc-coated steel wire,
1.2.2 ACSR/GB/COMP—Compact ACSR using Class B zinc-coated steel wire,
1.2.3 ACSR/GC/COMP—Compact ACSR using Class C zinc-coated steel wire,
1.2.4 ACSR/AZ/COMP—Compact ACSR using aluminum-coated (aluminized) steel wire, and
1.2.5 ACSR/AW/COMP—Compact ACSR using aluminum-clad steel wire.
1.3 The SI values of density and resistivity are to be regarded as standard. For all other properties the inch-pound values are
to be regarded as standard and the SI units may be approximate.
NOTE 1—Prior to 1975, aluminum 1350 was designated as EC aluminum.
NOTE 2—The aluminum and temper designations conform to ANSI H35.1. Aluminum 1350 corresponds to Unified Numbering System A91350 in
accordance with Practice E527.
2. Referenced Documents
2.1 The following documents of the issue in effect on date of material purchase form a part of this specification to the extent
referenced herein.
2.2 ASTM Standards:
B193 Test Method for Resistivity of Electrical Conductor Materials
B230/B230M Specification for Aluminum 1350H19 Wire for Electrical Purposes
B232/B232M Specification for Concentric-Lay-Stranded Aluminum Conductors, Coated-Steel Reinforced (ACSR)
B263 Test Method for Determination of Cross-Sectional Area of Stranded Conductors
B341/B341M Specification for Aluminum-Coated (Aluminized) Steel Core Wire for Aluminum Conductors, Steel Reinforced
(ACSR/AZ)
B354 Terminology Relating to Uninsulated Metallic Electrical Conductors
B498/B498M Specification for Zinc-Coated (Galvanized) Steel Core Wire for Use in Overhead Electrical Conductors
B502 Specification for Aluminum-Clad Steel Core Wire for Use in Overhead Electrical Aluminum Conductors
B802M Specification for Zinc-5% Aluminum-Mischmetal Alloy-Coated Steel Core Wire for Aluminum Conductors, Steel
Reinforced (ACSR)[Metric](Discontinued 1998-Replaced by B 802/B802M)
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
2.3 Other Documents:
ANSI H35.1, American National Standard Alloy and Temper Designation Systems For Aluminum
This specification is under the jurisdiction of ASTM Committee B01 on Electrical Conductors and is the direct responsibility of Subcommittee B01.07 on Conductors
of Light Metals.
Current edition approved Sept. 1, 2004. Published September 2004. Originally approved in 1963. Last previous edition approved in 1999 as B401 – 99. DOI:
10.1520/B0401-04.
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. ForAnnualBookofASTMStandards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B401 – 04
NBS Handbook 100—Copper Wire Tables of the National Bureau of Standards
3. Ordering Information
3.1 Orders for material under this specification shall include the following information:
3.1.1 Quantity of each size and stranding (Table 1),
3.1.2 Conductor size: circular-mil area or AWG (Section 6, and Table 1),
3.1.3 Steel wire coating or aluminum-clad (see 11.3),
3.1.4 Special tension test, if required (see 15.3),
3.1.5 Place of inspection (Section 16), and
3.1.6 Packaging and Package Marking (Section 17).
4. Joints
4.1 Electric-butt welds, electric-butt, cold-upset welds, or cold-pressure welds in the individual round-drawn or shaped
aluminum wires may be made during the stranding process. No weld shall occur within 50 ft (15 m) of a weld in the same wire
or in any other wire of the completed conductor.
4.2 There shall be no joints of any kind made in the finished coated, or aluminum-clad steel wires.
5. Lay
5.1 The preferred lay of the aluminum wires of aluminum conductors, steel-reinforced, having a single wire steel core and one
layer of aluminum wires is 14 times the outside diameter of the conductor but the lay shall be not less than 13 nor more than 16
times that diameter.
5.2 The preferred lay of the outside layer of aluminum wires of aluminum conductors, steel-reinforced, having multiple layers
of aluminum wires is 12 times the outside diameter of the conductor but the lay shall be not less than 11 nor more than 14 times
that diameter.
5.3 The preferred lay of the layer immediately beneath the outside layer of aluminum wires of aluminum conductors,
steel-reinforced, having multiple layers of aluminum wires is 14 times the outside diameter of such layer but the lay shall be not
less than 11 nor more than 17.5 times that diameter.
5.4 The direction of lay of the outside layer of aluminum wires shall be right hand.
5.5 The direction of lay shall be reversed in successive layers.
6. Construction
6.1 The diameter of the steel core wire, the number of aluminum wires, the aluminum cross-sectional area, the diameter and
weight of the compact round concentric-lay-stranded aluminum conductors, steel-reinforced, shall be as shown in Table 1.
7. Rated Strength of Conductor
7.1 The rated strength of a completed conductor shall be taken as the aggregate strength of the aluminum and steel components,
calculated as follows: The strength contribution of the aluminum wires shall be taken as the percentage, according to the number
of layers of aluminum wires, indicated in Table 2, of the sum of the strengths of the 1350-H19 wires, calculated on the basis of
Available from National Technical Information Service (NTIS), U.S. Department of Commerce, 5285 Port Royal Rd., Springfield, VA 22161.
TABLE 1 Construction Requirements for Compact Round Concentric-Lay-Stranded Aluminum Conductors, Steel Reinforced
Required Construction Nominal Mass for Conductors With:
Compact
Conductor Size Steel Wire Coated Steel Aluminum-Clad
Number of
Conductor
(Aluminum Wires) Diameter Core Wire Steel Core Wire
Aluminum
Diameter
Wires
cmil mm AWG in. mm in. mm lb/1000 ft kg/km lb/1000 ft kg/km
336 400 170.2 . 18 0.1367 3.47 0.628 15.95 364.8 543.3 357.2 531.1
266 800 135.0 . 18 0.1217 3.09 0.559 14.20 289.1 430.8 283.1 421.1
211 600 107.2 0000 6 0.1878 4.77 0.517 13.13 290.8 433.4 276.5 412.1
167 800 85.1 000 6 0.1672 4.25 0.461 11.71 230.5 343.9.0 219.2 327.1
133 100 67.3 00 6 0.1489 3.78 0.410 10.41 182.8 272.3 173.8 258.9
105 600 53.5 0 6 0.1327 3.37 0.365 9.27 145.2 216.4 138.1 205.8
83 690 42.4 1 6 0.1181 3.00 0.326 8.28 115.0 171.4 109.4 163.0
66 360 33.6 2 7 0.1299 3.30 0.298 7.57 106.6 158.6 99.8 148.4
66 360 33.6 2 6 0.1052 2.67 0.290 7.37 91.2 135.9 86.8 129.2
52 620 26.7 3 6 0.0937 2.38 0.258 6.55 72.4 107.9 68.8 102.6
41 740 21.1 4 7 0.1029 2.61 0.236 5.99 67.0 99.7 62.7 93.4
41 740 21.2 4 6 0.0834 2.12 0.229 5.82 57.3 85.6 54.5 81.4
26 240 13.3 6 6 0.0661 1.68 0.182 4.62 36.0 53.7 . .
B401 – 04
TABLE 2 Strength Rating Factors
Stranding Rating Factor, %
Number of Wires Number of Layers
Aluminum Steel
Aluminum Steel Aluminum Steel
A
61 1 96 96
A
71 1 96 96
A
18 1 2 93 96
A
Central steel wire only: the 96 % Rating Factor is applied to the single steel
wire core in the event it contains a weld (made prior to drawing).
the nominal wire diameter for the corresponding noncompacted construction given in Specification B232/B232M and the
appropriate specified minimum average tensile strength given in Specification B230/B230M.The strength contribution of the steel
core shall be taken as 96 % of the strength of the steel wire calculated from its specified nominal diameter and the appropriate
specified minimum stress at 1 % extension given in Specification B341/B341M, B498/B498M, B502, or B802M, whichever is
applicable.
7.2 Rated strength and breaking strength values shall be rounded to three significant figures, in the final value only, in
accordance with Practice E29.
7.3 Rated strength of conductors are given in Table 3.
8. Density
8.1 For the purpose of calculating mass, mass per unit length, cross sections, and so forth, the density of aluminum 1350 shall
3 3
be taken as 2705 kg/m (0.0975 lb/in. ) at 20°C.
8.2 For the purpose of calculating mass, mass per unit length, cross sections, and so forth, the density of coated steel wire shall
3 3
be taken as 7780 kg/m (0.281 lb/in. ) at 20°C.
8.3 For the purpose of calculating mass, mass per unit length, cross sections, and so forth, the density of aluminum-clad steel
3 3
wire shall be taken as 6590 kg/m (0.2381 lb/in. ) at 20°C.
9. Mass and Electrical Resistance
9.1 Themassandelectricalresistanceofaunitlengthofstrandedconductorareafunctionofthelengthoflay.Theapproximate
mass and electrical resistance may be determined using an increment of 1.5 % for conductors composed of 1 steel and 6 or 7
aluminum wires and an increment of 2 % for conductors composed of 1 steel and 18 aluminum wires. When greater accuracy is
desired, the increment based on the specific lay of the conductor may be calculated (Explanatory Note 4).
9.2 In the calculation of the electrical resistance of a completed conductor, coated steel wires may be included.
9.3 The maximum electrical resistance of a unit length of stranded conductor shall not exceed 102 % of the nominal dc
resistance shown in Table 4 (Explanatory Note 6). When the dc resistance is measured at other than 20°C, it is to be corrected by
using the multiplying factor given in Table 5.
9.4 For conductors to be used in covered or insulated wires or cables dc resistance measurements may be used in lieu of the
method outlined in Section 12.
10. Workmanship, Finish, andAppearance
10.1 The conductor shall be clean and free of imperfections not consistent with good commercial practice.
TABLE 3 Rated Strengths for Compact Round Concentric-Lay-Stranded Aluminum Conductors, Steel-Reinforced
Rated Strength For Conductors With:
Aluminum-
Conductor Size
Coated Aluminum-Clad
Coated Steel Core Wire:
Steel Core Steel Core Wire
Wire
Number of
Class A Class B Class C
Aluminum
cmil mm AWG kips kN kips kN kips kN kips kN kips kN
Wires
336 400 170.2 . 18 8.26 36.3 8.54 37.6 8.68 38.2 8.54 37.5 8.40 36.9
266 800 135.0 . 18 6.54 28.81 6.82 30.0 6.88 30.3 6.77 29.8 6.66 29.3
211 600 107.2 0000 6 7.42 32.9 7.69 34.1 8.35 37.1 8.08 35.9 7.95 35.3
167 800 85.1 000 6 5.88 26.1 6.30 28.0 6.62 29.4 6.41 28.5 6.30 28.1
133 100 67.3 00 6 4.88 21.4 5.13 22.5 5.30 23.3 5.13 22.5 5.05 22.2
105 600 53.5 0 6 3.98 17.6 4.25 18.8 4.38 19.4 4.25 18.8 4.12 18.2
83 690 42.4 1 6 3.29 14.4 3.45 15.1 3.55 15.6 3.45 15.1 3.34 14.7
66 360 33.6 2 7 3.26 14.4 3.51 15.6 3.64 16.1 3.51 15.6 3.39 15.0
66 360 33.7 2 6 2.64 11.7 2.76 12.3 2.85 12.7 2.76 12.3 2.68 11.9
52 620 26.7 3 6 2.13 9.44 2.23 9.89 2.29 10.2 2.23 9.91 2.17 9.61
41 740 21.1 4 7 2.16 9.60 2.28 10.1 2.36 10.5 2.28 10.2 2.20 9.81
41 740 21.2 4 6 1.76 7.83 1.78 7.95 1.86 8.30 1.81 8.07 1.76 7.83
26 240 13.3 6 6 1.12 4.98 Not Not 1.19 5.28 1.16 5.13 1.12 4.98
Standard Standard
B401 – 04
TABLE 4 Nominal dc Resistance Values
Required Construction Nominal dc Resistance @20°C for Conductors With:
Conductor Size Steel Wire Coated Steel Aluminum-Clad
Number of
(Aluminum Wires) Diameter Core Wire Steel Core Wire
Aluminum
2 Wires
cmil mm AWG in. mm ohm/1000 ft ohm/km ohm/1000 ft ohm/km
336 400 170.2 . 18 0.1367 3.472 0.05113 0.1680 0.05060 0.1662
266 800 135.0 . 18 0.1217 3.091 0.06451 0.2118 0.06384 0.2096
211 600 107.2 0000 6 0.1878 4.770 0.07956 0.2611 0.07720 0.2533
167 800 85.1 000 6 0.1672 4.247 0.1004 0.3288 0.09739 0.3191
133 100 67.3 00 6 0.1489 3.782 0.1266 0.4157 0.1228 0.4033
105 600 53.5 0 6 0.1327 3.371 0.1594 0.5230 0.1546 0.5074
83 690 42.4 1 6 0.1181 3.000 0.2012 0.6600 0.1952 0.6403
66 360 33.6 2 7 0.1299 3.299 0.2503 0.8239 0.2393 0.7874
66 360 33.6 2 6 0.1052 2.672 0.2536 0.8332 0.2460 0.8084
52 620 26.7 3 6 0.0937 2.380 0.3203 1.049 0.3107 1.017
41 740 21.1 4 7 0.1029 2.614 0.3985 1.309 0.3809 1.251
41 740 21.2 4 6 0.0834 2.118 0.4034 1.322 0.3914 1.282
26 240 13.3 6 6 0.0661 1.679 0.6423 2.104 . .
TABLE 5 Temperature Correction Factors for Conductor
Resistance
Multiplying Factor for
Temperature, °C
Conversion to 20°C
0 1.088
5 1.064
10 1.042
15 1.02
20 1.00
25 0.98
30 0.961
35 0.943
40 0.925
NOTE—Although the temperature coefficient of aluminum is different
from steel, the approximate temperature correction factor is given in the
above chart. For a more accurate conductor resistance calculation the
individual resistance temperature coefficient for the aluminum and for the
steelmustbeincludedinthedcresistanceequationsshowninExplanatory
Note6.AsperASTMB193,the20°Ctemperaturecoefficientofresistance
for 1350 aluminium at 61.0 % IACS is 0.00403. The 20°C temperature
coefficient of resistance for aluminum clad steel at 20.3 %IACS is
0.00306. The 20°C temperature coefficient of resistance for zinc or
aluminum coated steel is not defined in ASTM B193, however a
approximated value of 0.005 has been used.
11. Requirements for Wires
11.1 Before stranding and compacting, the round aluminum wire used shall conform to the requirements of Specification
B230/B230M.
11.2 Aluminum wires shaped before stranding shall meet the requirements of Specification B230/B230M, except for shape,
tensile and elongation requirements, and diameter tolerances. The
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