The use of insulated wires in the southern and mountain areas do not a problem, because The effect insulation resistant to ultraviolet light and ozone. The need for insulated wire medium-voltage cable design has been implemented SAX. The first installation of insulated Wire VL-20 kV implemented in 1976 – the so-called PAS system – reinforced aluminum wires in the plastic insulation. Later, in 1981 in Finland was built the first line of SAX, where the wire insulation was made of polyethylene. In 1984, the operation of the system adopted vibrationproof SAX, also equipped with security devices from an electric arc. The system currently includes SAX and includes secure the wires with insulation silanosshivaemogo polyethylene, equipped with the corresponding linear-coupling valves, devices, lightning protection, vibration protection and mounting accessories related to them. In Sweden, first appeared in the VLZ 1985 – 3000 km, Norway VLZ first – in 1986 built 2,000 km.

Since in the 90s and the wires AMKA SAX were available and successfully used in Russia, now NOKIA KABEL in 1995 initiated the development of the company ORGRES set of normative and technical documentation for design, construction and operation of pilot lines The effect of 0.4 kV, and in 1996 – the same type of documentation VLZ 6-20 kV. Currently, rules already in place devices up to 1 kV The effect of CIP, as well as Rules for Design VLZ 6-20 kV. Design and development of domestic SIPs were launched in 1987 at the Irkutsk factory cable. In 1991, the TU-120 16.K71-91 were put into experimental production of wire marks SAPTA, SASPt, SAPssh and SASPssh.