A fire-retarding cable conduit for electrical lines in regions potentially exposed to fire in aircraft, has a tubular base body including an interior space for accommodating the electrical lines and may include a sheath. The base body comprise a plastic foam material, which in the event of a fire is intumescent the intumescent foam may form a material that is substantially free of plastic when exposed to fire. A continuous longitudinal slit may be provided for inserting the electrical lines into the tubular base body and may use a form that protects the lines during exposure to fire.