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86 Specifications Appendix A
1
Pollution: Any addition of foreign matter, solid, liquid or gaseous (ionized gases), that may produce a reduction of
dielectric strength or surface resistivity. Pollution Degree: For the purpose of evaluating clearances (the shortest
distance in air between two conductive parts), Pollution Degree 1 and Pollution Degree 2 are recognized for use in
the micro-environment.
Pollution Degree 1: No pollution or only dry, non-conductive pollution occurs. The pollution has no influence.
Pollution Degree 2: Normally only non-conductive pollution occurs. Occasionally, however, a temporary conductivity
caused by condensation must be expected.
Clearance: The shortest distance in air between two conductive parts.