Comment by quickthrowman

I’m not familiar with Australian (Austrian?) electrical code, but the correct size wire for circuits with 15A OCPDs in the US NEC is either #14 (2.5mm^2, rated for 60C) in a residential setting or #12 (4mm^2, rated for 75C) in a commercial setting [0]. If you can provide a link to the conductor ampacity table I can tell you if it matches.

[0] US code allows you to feed a motor on a 15A OCPD with #14s but everyone uses #12s in practice