Which thickness CY cable do I need for 1.5kW spindle?

[A_Camera]

I still think 0.75mm is fine the motor is 1.5Kw 3 phase and quite short. There are many people using that on this forum.

Yes, I know many people use that, but 0.75mm2 is lamp wire, not for motors, at least not for motors of the sizes we are discussing. Yes, handling a 1.5mm2 is not as easy as 0.75mm2, but still, not that difficult if you know how to solder and connect. Also, when you crimp the VFD end (which I guess you do) it is considerably safer to use 1.5mm2 than the lamp wire. 0.75mm2 or 0.5mm2 is for control wires in this area, not power.

Then again, this is just my opinion. I know many people will disagree and many people use far too thin cables for convenience, price and for lack of better knowledge and that "it works", also because they read these forums and go for the "majority rule" principle.