Interestingly their cable selector says I need a 4 conductor cable of 14AWG (2 sq mm) per conductor with an outer shield. That's for a 5m (16ft) length. I'm using 1 sq mm but don't run the spindle up to anywhere near it's full 3HP.

I'm not sure how many MYCNCUK readers own a six-wire spindle. I think the 3+3 solution is for much bigger machines than we ever see.

Kit