1.1 本规范涵盖绝缘电缆中一般使用的由圆铜线制成的裸改性同心绞合导体，无论是未涂覆的还是涂有锡、铅或铅合金的。这些导线应由不超过七根导线组成的中心芯构成，并由一层或多层螺旋铺设的导线包围。 1.2 为了本说明书的目的，导体分类如下（解释性的 附注1 和 附注2 ): 1.2.1 B级改装- 用橡胶、纸和交联聚乙烯等各种材料绝缘的导体。 1.2.2 C类修改和D类修改- 需要比B类改性导线更大灵活性的导线。 1.3 以英寸-磅或SI单位表示的值应单独视为标准值。每个系统应独立使用。合并两个系统的值可能导致不符合规范。对于由AWG或kcmil尺寸指定的导体尺寸，SI单位的要求是根据英寸-磅单位的相应要求进行数值转换的。对于由AWG或kcmil指定的导体尺寸，SI单位的要求已从以英寸-磅单位陈述或导出的相应值进行数值转换。对于仅由SI单位指定的导体尺寸，要求以SI单位陈述或推导。 1.3.1 对于密度、电阻率和温度，以SI单位表示的值被视为标准值。 附注1: 本质量标准与质量标准的显著差异 B8 如下:（。 1 ）中心芯允许包含最多七根导线，以无限的铺设长度拉入组件中，而规范 B8 只允许一个，并且（ 2 )该结构仅适用于19根或更多导线的绞合组件。 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《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 modified concentric-lay-stranded conductors made from round copper wires, either uncoated or coated with tin, lead, or lead alloy for general use in insulated electrical cables. These conductors shall be constructed with a central core consisting of not more than seven wires, surrounded by one or more layers of helically laid wires. 1.2 For the purposes of this specification, conductors are classified as follows (Explanatory Note 1 and Note 2 ): 1.2.1 Class B Modified— Conductors to be insulated with various materials such as rubber, paper, and crosslink polyethylene. 1.2.2 Class C Modified and Class D Modified— Conductors where greater flexibility is required than is provided by Class B Modified conductors. 1.3 The values stated in inch-pound or SI units are to be regarded separately as standard. Each system shall be used independently of the other. Combining the values from the two systems may result in non- conformance with the specification. 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 AWG or kcmil, the requirements in SI units have been numerically converted from corresponding values stated or derived in inch-pound units. For conductor sizes designated by SI units only, the requirements are stated or derived in SI units. 1.3.1 For density, resistivity and temperature, the values stated in SI units are to be regarded as standard. Note 1: The significant differences in this specification from Specification B8 are as follows: ( 1 ) The central core is permitted to contain up to seven wires drawn into the assembly with an infinite length of lay while Specification B8 permits only one, and ( 2 ) The construction is applicable only to stranded assemblies of 19 or more wires. 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.