CY or SY cable for stepper motor wiring?

[Jonathan]

Neither are ideal for high motion use

Ok, thanks for that. What cable would you suggest for high motion use, bearing in mind my cable runs are going to have to be quite long.

the 4 x 0.75mm2 is good for up to 8A motors

I was going to get 1.5mm^2 (with 4.2A motors..) since the price difference is not much, and it's nice to keep the voltage drop as low as possible.

[Jonathan]

Just worked out that I need about 30m of cable for my router!
The longest cable will be roughly 6m ... is that going to cause a problem? I could save about 8m if I either move the computer, or extend the parallel cable. What's worse extra wire on the parallel or the same on each stepper motor?