Can't remember any of our cats chewing on wires, but Fleur, our late Cavalier KCS, once managed to chew through the extension lead from the main socket to the office phone leaving us without phone and internet for several days. Where she chewed it wasn't immediately obvious and a call-out by a BT engineer cost me £85. When I realised what had had happened I threatened to put her on diet - but relented at the sight of those big eyes!
Mike