Cats (and dogs), as any owner will testify, have certain senses heightened beyond the imagination of us mere mortals. It may have sensed the voltage, or heat, or the plastic smelled in some way, before biting it. Cats have a very high pain threshold, (feel little pain), and one of their instincts is to bite harder if a victim put up a fight, and someone posted a piece recently about a guy who died after putting 12v wires in his mouth....
Alan
