本指南规定了选择可能受到污染、冰、雪或冷雾组合的室外环境影响的外部绝缘材料的程序。本选择方法适用于绝缘子、避雷器、套管、带电工具及其他额定电压在1kV以上的高压交直流设备。

The guide specifies procedures for selecting external insulation that is likely to be subjected to an outdoor environment that includes combinations of contamination, ice, snow, or cold fog. The selection methods are applicable to insulators, surge arresters, bushings, live line tools, and other high-voltage ac and dc apparatus with a rated voltage above 1 kV.