Good morning
I think this question, or similar ones, may come back again and again.
We have a building with Faraday cage lightning protection
So in the Main Distribution Panel we have included a T1+2 surge protection
Couple of floors up, we have a mechanical DB feeding condenser units that are exposed in the roof.
We also have an external services DB that is feeding external lighting (columns, bollards etc)
Now, I know that usually the sub DBs are being protected by T2 only SPD.
However I am reading that T1 is about direct lightning strike and I am wondering wether for these 2 DBs only I should use a T1+2 assuming that both the condensers on the roof or the lighting columns may be subject to a direct strike
I really would like your opinion on this.
Should I stick to a T2 or go to a T1+2 based on my train of thought above?
Thanks!