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Type of Flexible Control Cable with Shielded or Unshielded The use of shielded control cables in security systems provides some protection against power frequency and radio frequency interference. Shielded drain wires can reduce the number of false alarms generated. It can be widely used in areas where heavy equipment is located, such as production or factory floors. The core of the control cable is copper core, nominal cross-section 2.5mm2 and below, 2 ~ 61 cores; 4 ~ 6mm2, 2 ~ 14 cores; 10mm2, 2 ~ 10 cores. The control cables used in computer systems generally use polyvinyl chloride, polyethylene, cross-linked polyethylene, and fluoroplastic insulation products.