1.1 本规范涵盖了由圆形铜线制成的裸同心绞合导线，该导线未涂覆或涂有锡、铅或铅合金，用于电气用途。这些导线应采用一个由一层或多层螺旋敷设导线围绕的中心芯线。 注1: 本规范还允许将导体用作覆盖或绝缘的电导体。 注2: 本规范指南中也允许使用旨在防止水纵向传播并进一步覆盖/绝缘的密封导体。 1.2 就本规范而言，导线分类如下（解释 注1 和 注2 ): 1.2.1 AA级-- 用于架空线路中通常使用的裸导线。 1.2.2 A类-- 对于用耐候（耐候）、慢燃材料覆盖的导体，以及要求比AA级更大灵活性的裸导体。 1.2.3 B类-- 对于用各种材料（如橡胶、纸张、漆布等）绝缘的导体，以及要求更大柔性的A类导体。 1.2.4 C级和D级-- 对于需要比B类导线更大灵活性的导线。 1.3 密度的SI值被视为标准。 对于所有其他特性，英寸磅值应视为标准值，国际单位制可能是近似值。 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 bare concentric-lay-stranded conductors made from round copper wires, either uncoated or coated with tin, lead, or lead alloy for general use for electrical purposes. These conductors shall be constructed with a central core surrounded by one or more layers of helically laid wires. Note 1: This specification also permits conductors for use as covered or insulated electrical conductors. Note 2: Sealed conductors, that are intended to prevent longitudinal water propagation and are further covered/insulated, are also permitted within the guidelines of this specification. 1.2 For the purposes of this specification, conductors are classified as follows (Explanatory Note 1 and Note 2 ): 1.2.1 Class AA— For bare conductors usually used in overhead lines. 1.2.2 Class A— For conductors to be covered with weather-resistant (weather-proof), slow-burning materials, and for bare conductors where greater flexibility than is afforded by Class AA is required. 1.2.3 Class B— For conductors to be insulated with various materials such as rubber, paper, varnished cloth, and so forth, and for the conductors indicated under Class A where greater flexibility is required. 1.2.4 Class C and Class D— For conductors where greater flexibility is required than is provided by Class B conductors. 1.3 The SI values for density are regarded as the standard. For all other properties, the inch-pound values are to be regarded as standard and the SI units may be approximate. 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.