DEHNcon-H HVI light Conductor (high-voltage-resistant insulated down conductor) installed inside the supporting tube, for keeping the separation distance from conductive parts according to IEC/EN 62305-3, in order to prevent dangerous flashover between parts of the external lightning protection system and indoor conductive parts (electrical installation, pipes, etc.). In order to avoid creeping discharge, the HVI Conductor has a special outer sheath which makes it possible to discharge high lightning impulse voltages to a reference potential. DEHNcon-H HVI light Conductor (grey), with sealing end inside the supporting tube (length 1990 mm), air-termination tip (D10 mm length 500 mm) and earth connection element. Equivalent separation distance s ≤ 45 cm (in air), s ≤ 90 cm (solid material).