Surge arresters discharge class

[BenjaminBelgium]

Hello,
What is the difference between
10000A line discharge class 1 and a
10000A line discharge class 2 arrester?

I have to know this to choose what operating duty tests I have to do.

Greetings from Ghent
Benjamin

 

[BenjaminBelgium]

Sorry, found it... table 1 of the ABB file
class 1: Diameter of blocks 38 mm
class 2: 47 mm