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Pollution DegreePollution degree 1No pollution or only dry, non-conductive pollution occurs. The pollution has no effect. Pollution degree 2 Only non-conductive pollution occurs. Occasional temporary conducting as a result of dew formation must be reckoned with. Pollution degree 3 Conductive pollution or dry, nonconductive pollution occurs that can become conductive as a result of dew formation. Pollution degree 4 The contamination leads to continuous conductivity, e.g. caused by conductive dust, rain or snow. [Source: DIN VDE 0110 part 1, page 4] |