C3 for me, in general.
Maybe we're getting to the point, though, if the property was wired to later 17th, C2 could come into it.....but in such a case it should be RCD protected anyway...so there's already a C2 for that. If you think about it, you could save an awful lot of C2's with an RCBO. As regards zones, why would you want to check them for an EICR?...unless the plaster's falling off the wall and showing things up.
Maybe we're getting to the point, though, if the property was wired to later 17th, C2 could come into it.....but in such a case it should be RCD protected anyway...so there's already a C2 for that. If you think about it, you could save an awful lot of C2's with an RCBO. As regards zones, why would you want to check them for an EICR?...unless the plaster's falling off the wall and showing things up.