is the international standard used to select and size ceramic and glass insulators for high-voltage systems in polluted environments. Pollution on insulators causes dry-band arcing, which leads to flashovers and widespread power outages.
IEC 60815-2, titled "Selection and dimensioning of high-voltage insulators intended for use in polluted conditions – Part 2: Ceramic and glass insulators for a.c. systems," is an international standard. It provides system designers and substation engineers with a structured methodology to determine the correct size, profile, and creepage distance of ceramic (porcelain) and glass insulators based on environmental severity. iec 60815-2 pdf