tailieunhanh - Standard Specification for Zinc-Coated (Galvanized) Steel Overhead Ground Wire Strand

"Standard Specification for Zinc-Coated (Galvanized) Steel Overhead Ground Wire Strand" covers high-strength, extra-highstrength, and utilities grades of concentric lay steel wire strand composed of three wires or seven wires with Class A, Class B, or Class C zinc coatings specifically intended for use as overhead ground wires or static wires for electric power transmission lines. | Designation A363 03 Reapproved 2014 Standard Specification for Zinc-Coated Galvanized Steel Overhead Ground Wire Strand1 This standard is issued under the fixed designation A363 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 quality and purity that when drawn to the size of wire specified This specification covers high-strength extra-high- and coated with zinc the finished strand will have the strength and utilities grades of concentric lay steel wire strand properties and characteristics prescribed in this specification. composed of three wires or seven wires with Class A Class B The slab zinc when used for the coating shall be any or Class C zinc coatings specifically intended for use as grade of zinc conforming to Specification B6. overhead ground wires or static wires for electric power transmission lines. 6. Stranding The values stated in inch-pound units are to be regarded The strand shall have a left lay with a uniform pitch of as standard. The values given in parentheses are mathematical not more than 16 times the nominal diameter of the strand. A conversions to SI units that are provided for information only left lay is defined as a counter-clockwise twist away from the and are not considered standard. observer. Stranding shall be sufficiently close to ensure no significant reduction in diameter when stressed to 10 of the 2. Referenced Documents minimum breaking strength. ASTM Standards A90 A90M Test Method for Weight Mass of Coating on 7. Preforming Strand Iron and Steel Articles with Zinc or Zinc-Alloy Coatings Preformed strand shall be supplied when so specified by A902 Terminology Relating to Metallic Coated Steel Prod- the purchaser. Strand is preformed when the component wires ucts