A 10mm cable can carry between 40 and 70 amps of current. The quality of the conductor and insulator determine the current that a wire can carry. The conductor and ambient temperature play a large factor in the load capacity and the safety of the wiring.
A wire that has a sheathed or armored thermoplastic outer coating is able to conduct a greater load than one without. Cables composed of a greater number of wires can carry multiple phases of power safely. The power source needs to be considered when determining if the cable is able to handle the current safely. Use a multimeter to determine if proper voltage is reaching the load.