Correct wire size for servo/stepper motors ? Dummy question

[JAZZCNC]

A good 4 core 1mm will see you right in terms of the +/- power and grounds and will have other uses if all goes wrong.
A Lapp 12 core is a waste!.
All the signals are doing is turning voltage through the cable on or off I/O. There's barely any current going through them.
Most of my stuff is either using Cat6, Cat7 (ethernet) or DB## type wiring for most signaling (5v & 24v).

If you know for sure you won't need more than 7 wires you could use a Cat6A STP (shielded twisted pair).
A good option for this use ^.

This has got nothing to do with current and everything to do with Signal and cable quality.

Cat5,6 or 7 is completely the wrong cable for this application and will cause him nothing but trouble in time. Ethernet cable is not designed to constantly move inside cables chains and over time it will break. It's fine in the control cabinet or if fixed to the machine but BAD for moving axis and cables.

Andrew:
The I/O cables are low voltage/current so don't need to be high current cables but they DO need to be flexible and screened well, this is why you need a quality cable rather than a stiff brittle cable which is what Cat5 type cable is and don't let anyone tell you differently because it will fail in time on an application like this.

Also, servo drives are far less forgiving than Stepper drives when it comes to stray voltages and electrical noise, the slightest bit of noise will make them twitch and because you plan on using the AXBB-E that doesn't offer differential output signals and the fact you will have very long I/O signal cables makes you wide open to cross signal contamination. Again this is why you need to use quality cable and with good grounding.

If your wire runs are very long I would consider using a differential line driver module to help boost and keep the signals clean.

Lastly and I don't think you mean to do this but I'll mention it just in case because you mention 12 core cables!
Don't run high power cables down the same cable as I/O, use a separate cable for the power.

There doesn't seem to be a ground connection on the servo so it looks like i'll have to make sure the grounding on the frame is solid.
Cheers
Andrew

I wasn't referring to power grounding, I was meaning good grounding practises ie: Star grounding and sending the shields to the ground point.