1.1 本规范涵盖了用作架空电导体的钢支撑（ACSS/TW）异形线紧凑同心绞合铝导体（见说明 注1 ). 1.2 以英寸-磅单位表示的值应视为标准值。括号中给出的值是对SI单位的数学转换，仅供参考，不被视为标准值。 1.2.1 例外情况- 对于AWG或kcmil尺寸指定的导体尺寸，SI单位的要求从英寸-磅单位的相应要求进行数字转换。对于仅由SI单位指定的导体尺寸，要求以SI单位表示或导出。 对于密度、电阻率和温度，以SI单位表示的值应视为标准值。 1.3 ACSS/TW设计用于通过使用梯形导线（TW）增加给定直径导体的铝面积，或减小给定面积铝的直径。导体由两层或多层梯形铝1350-0电线围绕的圆形钢丝的中心芯组成。相同尺寸导体的不同绞合线按类型标识，这是钢面积与铝面积的近似比率，以百分比表示（见 表1 , 表2 和 表3 ). 在本规范中 表1 和 表2 根据面积或外径等于标准ACSR、ACSS和ACSR/TW规定尺寸的成品导体制成表格，以便于导体选择。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。

1.1 This specification covers shaped wire compact concentric-lay-stranded aluminum conductors, steel supported (ACSS/TW) for use as overhead electrical conductors (see Explanatory Note 1 ). 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. 1.2.1 Exceptions— For conductor sizes designated by AWG or kcmil sizes, the requirements in SI units are numerically converted from the corresponding requirements in inch-pound units. For conductor sizes designated by SI units only, the requirements are stated or derived in SI units. For density, resistivity, and temperature, the values stated in SI units are to be regarded as standard. 1.3 ACSS/TW is designed to increase the aluminum area for a given diameter of conductor by the use of trapezoidal shaped wires (TW), or to reduce the diameter for a given area of aluminum. The conductors consist of a central core of round steel wire(s) surrounded by two or more layers of trapezoidal aluminum 1350-0 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 (see 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 specified sizes of standard ACSR, ACSS, and ACSR/TW so as to facilitate conductor selection. 1.4 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.