Quote Originally Posted by Jonathan View Post
It's a 1.5kW spindle, so anything above that and the VFD will cut out within a few seconds - i.e. too fast for the cable to heat up, so you only need to rate the cable for 1.5kW. 1500/230=6.5 amps, hence 1mm^2 (rated for 10 amps) is plenty for a 1.5kW spindle and just enough for 2.2kW as 2200/230=9.6A.
Didn't realise it was 1.5Kw spindle so yep 1.5^2 fine.