Method for manufacturing PTC device and system for preventing overheating of planar heaters using the same

Disclosed are a method for manufacturing a positive temperature coefficient (PTC) device and a system for preventing overheating of a planar heater using the same. The manufacturing of the positive temperature coefficient (PTC) device is performed by mixing one or more polymer resins selected from ethylene butyl acrylate copolymers, ethylene vinyl acetate copolymers and polyethylene oxide, carbon black and an additive to prepare a compounding composition, adhering an electrode to both surfaces of the compounding composition, compressing the resulting electrode structure into a sheet, and irradiating electron beams to the sheet to perform cross-linking. Also, disclosed is a planar heater overheating prevention sensor cable obtained by connecting a plurality of PTC devices in series and adhering the devices to the surface of a planar heater by a predetermined distance. The PTC overheating prevention sensor cable is bent in one direction and adhered to a region in which a planar heater is arranged, thus having a structure in which the PTC devices are randomly dispersed in the form of a dot. The system for preventing overheating of a planar heater controls electric current transfer of the planar heater, when overheating occurs in or around the region in which PCT devices are adhered due to abnormal operation and thus prevents the overheating, thereby exhibiting improved safety, high installment and construction efficiency, decreased energy loss and superior durability.