A device for marking a conductor, comprising: a gripper configured to grip the conductor extending in a longitudinal direction; a heating jaw assembly having two jaws spaced from each other in an open position in a first transverse direction transverse to the longitudinal direction, characterized in that the device further comprises: a transport mechanism for dispensing (114.2) a foil tape extending along the first transverse direction on a first side of the heating jaw assembly, wherein a foil side of the foil tape facing away from the heating jaw assembly is weldable by heat and a foil side of the foil tape facing the heating jaw assembly comprises the marking of the conductor; and a gripper mechanism configured to move the gripper along a second transverse direction transverse to the longitudinal direction and transverse to the first transverse direction when the heating jaw assembly is in the open position, wherein the gripper moves the gripped conductor from the first side of the heating jaw assembly through between the two jaws while entraining the foil tape abutting the conductor to a second side of the heating jaw assembly, the second side being opposite the first side, and wherein the two jaws in a closed position are configured to exert pressure on each other in the first transverse direction and to emit heat, wherein portions of the weldable foil side of the foil tape are brought into abutment with each other or configured to abut each other under the pressure of the jaws and the heat of the jaws welds or is configured to weld the portions for arranging the foil tape having the marking around the conductor in a circumferentially closed manner. a gripper configured to grip the conductor extending in a longitudinal direction; a heating jaw assembly having two jaws spaced from each other in an open position in a first transverse direction transverse to the longitudinal direction, a transport mechanism for dispensing (114.2) a foil tape extending along the first transverse direction on a first side of the heating jaw assembly, wherein a foil side of the foil tape facing away from the heating jaw assembly is weldable by heat and a foil side of the foil tape facing the heating jaw assembly comprises the marking of the conductor; and a gripper mechanism configured to move the gripper along a second transverse direction transverse to the longitudinal direction and transverse to the first transverse direction when the heating jaw assembly is in the open position, wherein the gripper moves the gripped conductor from the first side of the heating jaw assembly through between the two jaws while entraining the foil tape abutting the conductor to a second side of the heating jaw assembly, the second side being opposite the first side, and wherein the two jaws in a closed position are configured to exert pressure on each other in the first transverse direction and to emit heat, wherein portions of the weldable foil side of the foil tape are brought into abutment with each other or configured to abut each other under the pressure of the jaws and the heat of the jaws welds or is configured to weld the portions for arranging the foil tape having the marking around the conductor in a circumferentially closed manner.