Patent ID: 8878057

Claim:
A device for establishing grounding of an installation of different types, said device comprising: one or more cables, wherein a ground rail or a ground conductor, ground rails or ground conductors, or a ground point or ground points are grounded by the one or more cables comprising a combination of electrically conductive wires or conductors in at least one inner core and at least one outer layer which surrounds the inner core wholly or partly; and a bore extending, in at least one of ground and a rock, with a depth of more than 100 m, wherein the one or more cables are laid in the bore throughout the depth of more than 100 m, and wherein the electrically conductive wires or conductors in said at least one inner core include hundreds of thin conductors surrounded by said at least one outer layer that includes coarse conductors having a diameter more than a diameter of the thin conductors and wherein a ratio of a number of the thin conductors to a number of the coarse conductors is approximately 370/18.