1.1 本规范涵盖电气（母线）应用的铜包铝矩形棒。 1.2 覆铜铝条包括以下六类: 20A级——标称20体积%的退火铜。 25A级——标称25体积%的退火铜。 30A级——标称30体积%的退火铜。 20H级——标称20体积%铜，经过硬加工。 25H级——标称25体积%铜，经过硬加工。 30H级——标称30体积%铜，经过硬加工。 1.3 以英寸-磅为单位的数值应视为标准，电阻率和密度除外，其中SI单位为标准。括号中给出的值仅供参考。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This specification covers copper clad aluminum rectangular bar for electrical (bus) applications. 1.2 Six classes of copper-clad aluminum bar are covered as follows: Class 20A—Nominal 20 volume % copper, annealed. Class 25A—Nominal 25 volume % copper, annealed. Class 30A—Nominal 30 volume % copper, annealed. Class 20H—Nominal 20 volume % copper, hard-worked. Class 25H—Nominal 25 volume % copper, hard-worked. Class 30H—Nominal 30 volume % copper, hard-worked. 1.3 The values stated in inch-pound units are to be regarded as the standard, except for resistivity and density, where the SI units are the standard. The values given in parentheses are for information only. 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.