Class I+Class II = Class IIt is true that we haven't literally seen it, but the OP wrote ...
As most of us have said, it does seem that the most likely explanation is that the lampholder is Class II, whereas the rose is Class I.
This begs two questions - firstly, in such a 'mixed' (Class I + Class II) situation, what would we expect to be written on the box? In at least some senses, "Class I" would seem to be the 'safer' option?
Secondly, as already mentioned and discussed, is it actually compulsory that a Class II 'component' (i.e. the lampholder) must bear a Class II symbol/marking? - and I don't know the answer to that one. I had always assumed that if a product had exposed-conductive-parts and was not marked as being Class II, then it had to be regarded as Class I, and hence those exposed-c-ps earthed. However, as has been pointed out, such marking might be impractical in some cases (but not, I would have thought, for a lampholder) - so it will be interesting to see if anyone can come up with any 'chapter and verse' as regards what the relevant Standard says about this.
Kind Regards, John
It's got an earth terminal to the base where the ceiling wires connect in, hasn't it?
And the lampholders happen to be double insulated. That's no problem.
Since the installer won't be working on the lampholders, does there need to be a Class II marking? I don't see why, in fact such a label could confuse an installer into thinking the whole fitting does not need an earth connection.