An electric cable includes at least one power line having first and second ends, including multiple cores. Each core has a core insulation. All core insulations are enclosed by a common sheath surrounded by an oversheath that includes a material selected from silicones, perfluorocarbons, mica, glass fibers, metal fibers, ceramic fibers, and mixtures thereof. A first plug connector is arranged on the power line first end. At least one second plug connector is arranged on the power line second end. Each plug connector is completely coated with the oversheath and includes a flame retardant containing polyurethane. A first connecting nut is arranged on the first plug connector At least one second connecting nut is arranged on a second plug connector. Each connecting nut includes a perfluorocarbon. The electric cable has high resistance to welding use conditions and may be used as a control line for a welding device.