说明一般适用的要求。应结合单个指示器的规范阅读。指示器被视为主要与信息的视觉显示有关的单元。制造商应详细说明成品指示器外壳的尺寸和类型，以便于后续安装。

States the requirements which are generally applicable. Is to be read in conjunction with specifications for individual indicators. An indicator is regarded as a unit primarily concerned with the visual display of information. The size and type of the finished indicator case shall be declared by the manufacturer in sufficient detail to facilitate subsequent installation.