it's the engine earth you need to check-if poor connection this will cause cables etc to become substitute for correct cable!
k, June 2010
check the battery earth, if you have a bad earth then, it may try to earth through the clutch cable, which would cause the cable to get very hot & weld its self together, same can happen to accelerator cable.
jim, June 2010
cable maybe seized putting extra strain on pedal, would replace cable