pollution categories for IP rated consumer units.

[simonwood79]

Good afternoon all,

Following a conversation on another forum, I am after some fact-checking on some details.

The other person stated that if an electrical enclosure (external ccu) in a domestic setting is outside this is to be considered pollution category 4, it is my understanding that the fact the CCU is external will not make it category 4 unless some other external influences were present (or a very high chance).

It was always my understanding that these external influences would need to be in a form that comes from heavy industry such as coal mining or metal works. Even in these circumstances, I was under the impression that if the electrical equipment was IP rated, IP 65 for example, and properly installed this would reduce the pollution category for said equipment. 

If anyone can confirm this i would be grateful, especially if you could point me in the direction of any literature. 

Kind regards Simon  

[Gregoire_Brun · Accepted solution]

hello @simonwood79 

please see Ip level scale,   

For internal panel as polution degree 3, IP 44 can be acceptable for a panel borad inside an house.

outside  IP54 up to IP66 are mandatory .

Conserning for number ist solid object , 2nd is liquid

Hope iut help you

best regards