Voltage-leveling monolithic self-regulating heater cable

A self-regulating electric heater cable includes a monolithic heater core of PTC material encapsulating a pair of bus wires, and a conductive layer disposed on an outer surface of the heater core suchthat the conductive layer levels the voltage generated at the outer surface of the heater core when an electric current is passed through the bus wires. The conductive layer draws the current evenlythrough lobes of PTC material encapsulating the bus wires. The conductive layer may be a coating, such as a conductive ink or paint, or may be an extruded or wrapped material applied to the heater core. Standard heater cable layers are applied oyer the conduetive layer, including an electrically insulating layer that contacts a portion of the conductive layer and also may be separated from the conduetive layer by one or more air gaps. 种自调节电加热器电缆，包括封装对总线的PTC材料的整体式加热器芯，以及设置在加热器芯的外表面上的导电层以使得导电层调平在电流通过总线时在加热器芯的外表面产生的电压。导电层通过封装总线的PTC材料的凸角均匀地吸取电流。导电层可以是诸如导电墨水或涂料的涂层，或者可以是施加到加热器芯的挤出或包裹材料。标准加热器电缆层被施加在导电层上，导电层包括与导电层的部分接触的电绝缘层，并且