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

[Doddy]

I might be a bit fick but did you just say "Fatter cable will make spindle go faster"?

Not on a VFD driven spindle - it'll give more torque. Thinking about my old DC spindle (not really the case discussed here) - in that case yeah more spins.

Groan: That was bad wine last night.