According to a first aspect of the present invention, there is provided a self-regulating electrical heating cable comprising: a first power supply conductor extending along the length of the cable; a second power supply conductor extending along the length of the cable; a third power supply conductor extending alon...

According to an aspect of the present invention, there is provided a material which comprises a first component having a first positive temperature coefficient of resistance characteristic and a second component having a second positive temperature coefficient of resistance characteristic, the second positive temper...