ASTM B549-18

Standard Specification for Concentric-Lay-Stranded Aluminum Conductors, Aluminum-Clad Steel Reinforced for Use in Overhead Electrical Conductors

ABSTRACT
This specification covers concentric-lay-stranded conductors made from round aluminum 1350-H19 (extra hard) aluminum wires and round aluminum-clad steel core wires for use as overhead electrical conductors. For the purpose of this specification, conductors are classified as Class AA and Class A. The concentric-lay-stranded aluminum conductors, aluminum-clad steel reinforced (ACSR/AW) shall conform to the conductor size, number of wires, nominal diameter, rated strength, and mass per unit length. Before stranding, the aluminum and aluminum-clad steel core wires used shall meet all specfified requirements. The number and diameter of aluminum and steel wires and the areas of cross section of aluminum wires shall conform to prescribed the requirements. The rated strength of a completed conductor shall be taken as the aggregate strength of the aluminum and aluminum-clad steel components. The strength contribution of the aluminum-clad steel core wires shall be taken as the percentage according to the number of layers of aluminum-clad steel wires. Tests for mechanical and electrical properties of aluminum wires shall be made before stranding. All aluminum wires composing the conductors shall be capable of meeting the bending properties after stranding, as stated in the referenced ASTM documents.
SCOPE
1.1 This specification covers concentric-lay-stranded conductors made from round aluminum 1350-H19 (extra hard) aluminum wires and round aluminum-clad steel core wires for use as overhead electrical conductors (Explanatory Note 1 and Note 2).  
1.2 The SI values of density and resistivity are to be regarded as standard. For all other properties the inch-pound units are regarded as standard and the SI units may be approximate.  
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Historical
• Publication Date: 28-Feb-2018
• ICS: 29.240.20 - Power transmission and distribution lines
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.07 - Conductors of Light Metals

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:B549 −18
Standard Specification for
Concentric-Lay-Stranded Aluminum Conductors, Aluminum-
Clad Steel Reinforced for Use in Overhead Electrical
1
Conductors
This standard is issued under the fixed designation B549; 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 Electrical Conductors
B502 Specification for Aluminum-Clad Steel Core Wire for
1.1 This specification covers concentric-lay-stranded con-
Use in Overhead Electrical Aluminum Conductors
ductors made from round aluminum 1350-H19 (extra hard)
E29 Practice for Using Significant Digits in Test Data to
aluminum wires and round aluminum-clad steel core wires for
Determine Conformance with Specifications
use as overhead electrical conductors (Explanatory Note 1 and
3
Note 2). 2.3 ANSI Standards:
ANSI C 42.100 Dictionary of Electrical and Electronics
1.2 The SI values of density and resistivity are to be
Terms
regarded as standard. For all other properties the inch-pound
ANSI H 35.1 American National Standard Alloy and Tem-
units are regarded as standard and the SI units may be
per Designation Systems for Aluminum
approximate.
2.4 Other Standard:
1.3 This international standard was developed in accor-
NBS Handbook 100—Copper Wire Tables of the National
dance with internationally recognized principles on standard-
4
Bureau of Standards
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
3. Terminology
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
3.1 Description of Terms Specific to This Standard
3.1.1 ACSR covered by this specification has one type of
2. Referenced Documents
steel core wire which is designated by the following abbrevia-
2.1 The following documents of the issue in effect on date tion (Explanatory Note 2):
of material purchase form a part of this specification to the 3.1.1.1 ACSR/AW—ACSR using aluminum-clad steel wire
extent referenced herein. (Explanatory Note 2).
2
2.2 ASTM Standards:
4. Classification
B230/B230M Specification for Aluminum 1350–H19 Wire
for Electrical Purposes
4.1 For the purpose of this specification, conductors are
B263 Test Method for Determination of Cross-Sectional
classified as follows (Explanatory Note 1 and Note 2):
Area of Stranded Conductors
4.1.1 Class AA—For bare conductors usually used in over-
B354 Terminology Relating to Uninsulated Metallic Electri-
head lines. These conductors are used as follows:
cal Conductors
4.1.1.1 Conductors used for regular overhead line construc-
B500/B500M Specification for Metallic Coated or Alumi-
tion and
num Clad Stranded Steel Core for Use in Overhead
4.1.1.2 Conductors having a high ratio of mechanical
strength to current-carrying capacity used for overhead ground
wires and for extra-long span construction.
1
This specification is under the jurisdiction of ASTM Committee B01 on
4.1.2 Class A—For conductors to be covered with weather-
Electrical Conductors and is the direct responsibility of Subcommittee B01.07 on
resistant (weatherproof) materials.
Conductors of Light Metals.
Current edition approved March 1, 2018. Published March 2018. Originally
approved in 1971. Last previous edition approved in 2013 as B549 – 13. DOI:
10.1520/B0549-18.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM 4th Floor, New York, NY 10036, http://www.ansi.org.
4
Standards volume information, refer to the standard’s Document Summary page on Available from National Technical Information Service (NTIS), 5301 Shawnee
the ASTM website. Rd., Alexandria, VA 22312, http://www.ntis.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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B549−18
5. Ordering Information ofanystrandedconductorconsistingof7wiresormoremaybe
slightly compressed, thereby reducing the outside diameter of
5.1 Orders for material under this specification shall include
the conductor by not more than 3 %, provided that the area of
the following information:
cross section after compressing is in accordance with Section
5.1.1 Quantity of each size, stranding, and class,
13.
5.1.2 Conductor size: circular mil area or AWG of alumi-
num wires (Section 9 and Table 1),
10. Rated Strength of Conductor
5.1.3 Number of wires, aluminum, and aluminum-clad steel
10.1 The rated strength of a completed conductor shall be
(Table
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM 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: B549 − 13 B549 − 18
Standard Specification for
Concentric-Lay-Stranded Aluminum Conductors, Aluminum-
Clad Steel Reinforced for Use in Overhead Electrical
1
Conductors
This standard is issued under the fixed designation B549; 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 concentric-lay-stranded conductors made from round aluminum 1350-H19 (extra hard) aluminum
wires and round aluminum-clad steel core wires for use as overhead electrical conductors (Explanatory Note 1 and Note 2).
1.2 The SI values of density and resistivity are to be regarded as standard. For all other properties the inch-pound units are
regarded as standard and the SI units may be approximate.
1.3 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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
2.2 ASTM Standards:
B230/B230M Specification for Aluminum 1350–H19 Wire for Electrical Purposes
B263 Test Method for Determination of Cross-Sectional Area of Stranded Conductors
B354 Terminology Relating to Uninsulated Metallic Electrical Conductors
B500/B500M Specification for Metallic Coated or Aluminum Clad Stranded Steel Core for Use in Overhead Electrical
Conductors
B502 Specification for Aluminum-Clad Steel Core Wire for Use in Overhead Electrical Aluminum Conductors
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
3
2.3 ANSI Standards:
ANSI C 42.100 Dictionary of Electrical and Electronics Terms
ANSI H 35.1 American National Standard Alloy and Temper Designation Systems for Aluminum
2.4 Other Standard:
4
NBS Handbook 100—Copper Wire Tables of the National Bureau of Standards
3. Terminology
3.1 Description of Terms Specific to This Standard
3.1.1 ACSR covered by this specification has one type of steel core wire which is designated by the following abbreviation
(Explanatory Note 2):
3.1.1.1 ACSR/AW—ACSR using aluminum-clad steel wire (Explanatory Note 2).
1
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 April 1, 2013March 1, 2018. Published May 2013March 2018. Originally approved in 1971. Last previous edition approved in 20102013 as
B549 – 10.B549 – 13. DOI: 10.1520/B0549-13.10.1520/B0549-18.
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 Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
4
Available from National Technical Information Service (NTIS), 5301 Shawnee Rd., Alexandria, VA 22312, http://www.ntis.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B549 − 18
4. Classification
4.1 For the purpose of this specification, conductors are classified as follows (Explanatory Note 1 and Note 2):
4.1.1 Class AA—For bare conductors usually used in overhead lines. These conductors are used as follows:
4.1.1.1 Conductors used for regular overhead line construction and
4.1.1.2 Conductors having a high ratio of mechanical strength to current-carrying capacity used for overhead ground wires and
for extra-long span construction.
4.1.2 Class A—For conductors to be covered with weather-resistant (weatherproof) materials.
5. Ordering Information
5.1 Orders for material under this specification shall include the following information:
5.1.1 Quantity of each size, stranding, and class,
5.1.2 Conductor size: circular mil area or AWG of aluminum wires (Section 9 and Table 1),
5.1.3 Number of wires, aluminum, and aluminum-clad steel (Tabl
...