[jaclaz]

At least in Italy, that would apply as well.

I.e. you can have in same conduit a "protected" (double insulation) mains cable (the type is called FG16 now, it was FG7) and a low voltage/signal cable.

The idea is that the FG cable in itself, having the external insulation besides the single wire insulation and being suitable to "unprotected" installation can coexist with signal cables, the conduit in this case is only an added mechanical protection.

The type of certified 400 V insulated cables I mentioned earlier is instead allowed to coexist with "normal" single wires (this is the normal way electricity is distributed in buildings) inside a conduit.

The issue using FG cables (besides the fact that it is way harder to be inserted in small conduits) might be that it would be suitable to power (say) a mains receptacle (live+neutral+earth) but wouldn't be suitable for (still say) a diverter or a reverse switch due to the colour coding of the wires.