Low current devices such as AC ceiling fans use so little current that the wire gauge is largely based on the minimum sizing for code standards. At least in the

Low current devices such as AC ceiling fans use so little current that the wire gauge is largely based on the minimum sizing for code standards. At least in the US, you can't put anything smaller than 14 gauge (AWG) in walls. Maybe in Europe they allow much smaller gauge, in which case maybe it makes sense... but usually there are minimum requirements for wiring since it becomes a structural issue (i.e., too thin of wire will break easily when pulled).