These halogen-free and flame retardant screened installation cables with twisted pairs on a fixed operating mode can continiue energy trans-mission under fire conditions. These cables are used in instrumentation and control engineering; in communication and automation systems, safety and fire alarm systems, data and signal transmission in electronic purposes. And also screen provides protection against external electrical interferences. Halogen-free cables are used in the closed environments, at schools, airports, hospitals, malls etc. where low corrosive gases and low smoke density must have in case of fire. With blue sheath it is suitable for intrinsically safe systems. With blue sheath it is suitable for intrinsically safe systems. These cables are used for indoor applications, not intended for outdoor or underground installation.