本文件规定了测量电线和电缆识别标记与未标记电线绝缘背景对比度的过程。其主要目的是定义一个可重复的对比度值测定过程，用于在制造时或之后确定电线的固有激光标记性，并使电线系统制造商能够确保电线标记的整个过程符合要求的标准。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This document specifies the process to be applied for measuring the contrast of wire and cable identification markings against the background of the unmarked wire insulation. It has been developed primarily to define a reproducible process of contrast value determination for use both to determine the intrinsic laser markability of wires at the time of manufacture or later, and to enable electrical wiring systems manufacturers to ensure that the whole process of wire marking is carried out to the required standard.All current amendments available at time of purchase are included with the purchase of this document.