标准摘要
[中文适用范围]： 第 1 部分的本条款在添加以下内容后适用：1.1 添加以下段落：本标准规定了用于安装在墙壁和/或天花板上的 PT 系统的特殊要求和测试。它们可以齐平或半齐平、表面安装、悬挂或使用固定装置与表面间隔安装。 [外文原描述]： This standard specifies the particular requirements and tests for PT systems intended for mounting on walls and/or ceiling. They may be installed flush or semi-flush, surface mounted, suspended or spaced away from the surface using fixing devices.
英文名称Powertrack systems - Part 21: Particular requirements for powertrack systems intended for wall and ceiling mounting