Abstract: Clamp for connecting together a ground lead and a ground rod comprising a clamp body with a cavity which surrounds the rod, said cavity is a blind cavity which is conical at least over a part of its length. The clamp body further has a solid section in which a separate hole is provided in which a wire is secured by compression, said wire projecting outside the hole by a length such that it is possible to connect this wire to another wire.The compression joint between the piece of wire and the clamp body can now be produced in the factory. At the site it is quite simple to connect the ground lead with the piece of wire compressed in the clamp.