With the widespread use of EHV equipment in winter environments, winter flashovers at air temperature close to melting point have become a critical design constraint. This book explores the issues of electrical insulators for icing and polluted environments, enabling engineers and environmental specialists to carry out appropriate measurements, understand how they change with time and weather, and work out how they compare with the upper limits set by insulator dimensions. It is essential reading for anyone involved with issues relating to icing and pollution problems in electrical line insulation.