A pipe has an innermost layer, outside of which there is an inner electrode layer, outside of which there is an insulating layer, outside of which there is an outer electrode layer. The innermost layer is made of plastic by continuous extrusion and the insulating layer is made of foamed plastic.
This application is a divisional of application Ser. No. 08/981,360 filed on Dec. 18, 1997, which is a divisional of Ser. No. 08/981,219 filed on Oct. 8, 1998 now abandoned, which is PCT/FI96/00359 filed on Jun. 20, 1996, which designated the U.S., was published in English, claims the benefit thereof and incorporates the same by reference.
