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Description of ASTM-B779 2018ASTM B779-18Historical 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. 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.
(A) Code words shown in this column are obtained from Specification B1006. 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 × 1.4887.
(C) 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).
(D) To convert the diameter (inches) to mm, multiply the inch value × 25.4.
(E) To convert from kcmil to mm2 area, multiply the kcmil value × 5.067 × 10-4.
(F) For 795 kcmil Type 10 (Puffin ACSR TW) conductor the indicated 0.1108 in. steel wire size does not
correspond with the concentric round wire 795 kcmil 22/7 Puffin ACSR conductor. The round wire construction utilizes a 0.1056” diameter steel core wire. The industry accepted dimension for
the Puffin ACSR TW steel wire is 0.1108 in. Technically this renders the construction as a Type 11 conductor. The conductor mass, rated strength and diameter values correspond to the 0.1108
in. diameter steel core.
(A) Code words shown in this column are obtained from Specification B1006. They are provided for information only.
(B) To convert from kcmil to mm2 area, multiply the kcmil value x 5.067 x 10-4.
(C) 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.
(D) 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).
(E) To convert the diameter (inches) to mm, multiply the inch value x 25.4.
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. Keywords ICS Code ICS Number Code 29.240.20 (Power transmission and distribution lines) DOI: 10.1520/B0779-18 The following editions for this book are also available...
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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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