Thermal and compensating cables are used in temperature measurements with a thermocouple. A thermocouple consists of 2 sensors made of different metals or alloys between which an electrical voltage is produced dependant on the temperature. The cables transmit this voltage from the thermocouple to the reference point. The voltage strength is assigned to a temperature at the measuring point using a measuring instrument. The sheath and insulation materials are made of PVC, silicon or glass fibre for different ambient temperatures.