适用于用于室内或室外服务的陶瓷材料或玻璃支柱绝缘子和支柱绝缘子单元，以及用于在标称电压大于1000 V、频率不大于100 Hz的交流系统上运行的电气装置或设备的室内服务的有机材料支柱绝缘子。也可将其视为直流系统用绝缘子的临时标准。

Applies to post insulators and post insulator units of ceramic material or glass intended for indoor or outdoor service, and to post insulators of organic material intended for indoor service in electrical installations or equipment operating on alternating current systems with a nominal voltage greater than 1 000 V and a frequency not greater than 100 Hz. It may also be regarded as a provisional standard for insulators for use on direct current systems.