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IEVref:851-15-17ID:
Language:enStatus: Standard
Term: pollution degree
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Definition: numeral characterizing the expected pollution of the micro-environment

NOTE – For the purpose of evaluating creepage distances and clearances, the following four pollution degrees in the microenvironment are established in 2.5.1 of IEC 60664-1:1992.

a) pollution degree 1: No pollution or only dry, non-conductive pollution occurs. The pollution has no influence.

b) pollution degree 2: Only non-conductive pollution occurs except that occasionally a temporary conductivity caused by condensation is to be expected.

c) pollution degree 3: Conductive pollution occurs, or dry, non-conductive pollution occurs which becomes conductive due to condensation is to be expected

d) pollution degree 4: The pollution generates persistent conductivity caused by conductive dust or by rain or snow.


Publication date:2008-06
Source:IEC 60664-1:1992, 1.3.13
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