Abstract: A device for transporting a medium includes at least one channel which extends in an axial direction and through which the medium is guided. The channel is enclosed by an electrically conductive inner envelope that is connected to a first potential equalization conductor. An electrically conductive outer envelope is provided between the channel and an electrically conductive outer casing and is connected to an electrically conductive second potential equalization conductor. Arranged between the channel and the outer envelope is an electrically insulating intermediate layer which is produced from heat-insulating material.

Abstract: The invention relates to a contact tip (1) for arc welding with at least one channel (2) passing through the contact tip (1) for receiving a welding wire (3), the channel (2) having a non-round stellate, multi-lobular cross-section with convexly rounded sides.