A vehicle electrical system component for a data transmission system in a motor vehicle, in particular for an Ethernet transmission system, having a cable with wires and a plug having wire connection contacts for contacting the wires, wherein the wires have an electrical insulation, wherein a common shielding is arranged around the wires which is enclosed by a common cable sheath, wherein the cable has at least three wires and an electrically conductive drain wire, wherein the drain wire contacts the shielding at least in sections and is contacted to a wire connection contact of the plug.