Pollution Degree

The level of pollution in the environment in which the Assembly is intended to be

installed. Four categories are defined in the Standard as follows:

 

Pollution degree 1 : No pollution or only dry, non-conductive pollution occurs.

Pollution degree 2 : Normally, only non-conductive pollution occurs. Occasionally, however, a temporary

                             conductivity caused by condensation may be expected.

Pollution degree 3 : Conductive pollution occurs, or dry, non-conductive pollution occurs which becomes

                             conductive due to condensation.

Pollution degree 4 : The pollution generates persistent conductivity caused, for instance, by conductive dust or by

                             rain or snow.

 

Unless advised otherwise, the Standard and the manufacturer will assume

pollution degree 3 is applicable for industrial applications.