The core of the control cable is a copper core, with a nominal cross section of 2.5mm2 and below, 2 to 61 cores; 4 to 6mm2, 2 to 14 cores; 10mm2, 2 to 10 cores. Control cable working temperature: rubber insulation is 65 ° C, PVC insulation is 70 ° C and 105 ° C. The control cables used in computer systems are generally selected from polyvinyl chloride, polyethylene, cross-linked polyethylene and fluoroplastic insulation products.