Supply cables are 1.5mm^2. I dont have my regs book handy but they should be good for around 16Amps. All cables are shielded are are grounded at one end only should interference should be minimal. I will check the load drawn and the voltage supply to the last driver and see what they are. If there is a problem it will be simple to change it. I remember the manual saying about the clearance distances between drivers but the panel was already there and begging to be used. A couple of 80mm diameter cooling fans should take care of the heat.