you could try threading the wires inside pvc-pipe, garden hose, or a vaccum hose to channel it from place to place making it hidden and protected.
or use a taste repelant like "bitter apple" most pets hate the taste and once he bites it he shouldnt again, but it does ware off after a few hours so i would spray some on the wires every time you take him out of his cage. it and other simular products should be should be available at most vet offices and pet supply stores
or you could try using both methods threading through the pipe/hose and using the spray
i hope this helps good luck
