That's a tough thing.

There are things you can try I believe..there are cord encasements you can buy at an electronics store, that will enclose exposed cords, you could try that they are ribbed and a harder material than the cords are made of. There is also some kind of spray repellent you could also try putting directly on the cords, the stuff is supposed to taste horrible to them.

Try doing some research online, check out Petsmart, and Petsco. Your vet may have something or at least some ideas as well.

I had this problem early on with one of them and had the spray...they did eventually grow out of the attraction to the cords.

Good luck.