HEATING CABLE Russian patent published in 2014 - IPC H05B3/56 

FIELD: electricity.

SUBSTANCE: invention is referred to heating cables fit for use with three-phase power supply source. The electric heating cable contains: the first power supply conductor (1a) extended along the cable length; the second power supply conductor (1b) extended along the cable length; the third power supply conductor (1c) extended along the cable length; at that the first and second power supply conductors are interconnected electrically through the first electroconductive body of the heating element having positive temperature resistance coefficient, while the second and third power supply conductors are interconnected electrically through the second electroconductive body of the heating element having positive temperature resistance coefficient, at that the first, second and third power supply conductors are not interconnected physically.

EFFECT: invention provides balanced load between conductors thus ensuring its use with three-phase power supply sources.

8 cl, 12 dwg