7GC-B500 Multicore Cable, MachFlex 350 YY Control, Unscreened, 7 Core. Belden is a MachFlex 350 YY VDE registered flexible unshielded PVC control cable. Belden introduces the machine builder choice MachFlex cable which ensures greater performance level for the machine builders and a higher uptime for the end users. Designed for applications that are installed in occasional flexing and fixed locations. MachFlex 350 YY cables are used in precision control sensors, multi axis control machines, temperature controllers, control panels, machine cutting tools, auxiliary equipment, motor speed control and production machinery.