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Description of ASTM-B779 2012ASTM B779-12Historical Standard: Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Steel-Reinforced (ACSR/TW)ASTM B779Scope 1.1 This specification covers shaped wire compact concentric-lay-stranded aluminum conductor, steel-reinforced (ACSR/TW) and its component wires for use as overhead electrical conductors (Explanatory Note 1 and Note 2). 1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
Note 1—ACSR/TW is designed to increase the aluminum area for a given diameter of conductor by the use of
trapezoidally shaped wires (TW). The conductors consist of a central core of round steel wire(s) surrounded by two or more layers of trapezoidal aluminum 1350-H19 wires. Different strandings of
the same size of conductor are identified by type, which is the approximate ratio of steel area to aluminum area expressed in percent (Table 1,
Table 2 and Table 3). For the purpose of this specification, the sizes listed in Table 1 and Table 2 are tabulated on the basis of the finished conductor having an area or outside diameter equal to that of
specific sizes of standard ACSR so as to facilitate conductor selection.
TABLE 1 Construction Requirements for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated Steel Reinforced Size to Have Area Equal to ACSR, Class AA
A Mass per unit length is based on Class A zinc-coated steel.
B Rated strengths were calculated in accordance with 9.1 using steel stresses at 1 % for Class A coating in accordance with
Specification B498/B498M (1 kip = 1000 lbf = 4.448 kN).
TABLE 2 Construction Requirements for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated Steel Reinforced Sized to Have Diameter Equal to ACSR, Class AA
A Code words shown in this column are obtained from “Publication 50, Code Words for Overhead Aluminum Electrical Conductors,” by the Aluminum Association. They are
provided for information only.
B Mass per unit length is based on Class A zinc-coated steel. To convert to kg/km, multiply the lb/1000 ft value x 1.4887.
C Rated strength was calculated in accordance with 9.1 using steel stresses at 1 % for Class A coating in accordance with
Specification B498/B498M (1 kip = 1000 lbf = 4.445 kN).
D To convert the diameter (inches) to mm, multiply the inch value x 25.4.
E To convert from kcmil to mm2 area, multiply the kcmil value x 5.067 x 10-4.
TABLE 3 Construction Requirements for Shaped Wire Compact Concentric-Lay Stranded Aluminum Conductors Coated, Steel Reinforced
Note 2—The aluminum and temper designations conform to ANSI Standard H 35.1. Aluminum 1350 corresponds to Unified
Numbering System (UNS) A91350 in accordance with Practice E527.
Keywords ICS Code ICS Number Code 29.240.20 (Power transmission and distribution lines) DOI: 10.1520/B0779-12 The following editions for this book are also available...This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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