PURPOSE: To easily detect and control a local overheating by a heating cable in an electric carpet by providing an internal electrode, a primary temperature sensitive material layer, an external electrode, a secondary temperature sensitive material layer, and a sheath layer on a core body.

CONSTITUTION: A tape of copper alloy foil is spirally wound on a core body 12 consisting of polyester fiber to form a primary conductor (internal electrode) 13, a primary temperature sensitive material layer 14 is provided on the outside, and the tape of copper alloy foil is spirally wound thereon to form a secondary conductor (external electrode) 15. Then, a secondary temperature sensitive material layer 16 covered with a secondary temperature sensitive material is provided on the outside, and a sheath 17 by polyethylene is extruded over the most outside layer to form a temperature sensitive cable 11. The impedance of the layer 14 and the thermal stimulating current of the layer 16 are converted to judge whether a local overheating state is caused in the heating cable or not, and the heating cable is controlled through a temperature control circuit. Since the current-carrying to the heating cable can be thus easily stopped by detecting the local overheating, the local overheating by the heating cable can be prevented.