Let the fun begin !!! ???

[EddyCurrent]

While the cable you have would work, and many people use that I'm sure, if you look in the manuals for 2.2kw drives you will see that 2.5mm^2 is generally recommended.
Also I think it's a good idea to take an earth directly to the spindle because if you have a motor to earth fault a lot of current will flow, if you don't have an earth wire it could flow though the bearings finding a path to earth and this could ruin them. If you were selling these things commercially they would have to meet regulations which most likely also encompass manufacturers recommendations, but if it's for yoursefl then you have to decide how far you want to go.