作为选择面板开孔尺寸和仪表前部尺寸的指南，以便用户在计划安装时确保购买的设备适合，制造商可以设计以确保符合用户需求。确认了三个已知的模块化元件:12毫米和20毫米，均来自既定的欧洲实践，以及12.5毫米，IEC 60473中确立的模块。具有技术报告的状态。

Serves as a guide for selection of panel cut-out sizes and instrument front dimensions so that users may plan installations with the assurance that equipment purchased will fit, and manufacturers can design to ensure conformance to users' needs. Recognizes three known modular elements: 12 mm and 20 mm, both from established European practice, and 12.5 mm, the module established in IEC 60473. Has the status of a technical report.