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Alex used to chew on electric cords when he was a kitten. We used a product
called "Bitter apple" which is a spray you can buy at a pet supply store and
spray it on and it has a nasty taste. It didn't work with Alex, but it may
work with your cats. Try to find a nontoxic (to cats) substance with a nasty
odor, but forget the sprays with names like "Cat Off," as they are intended
for outdoor use. If you use them inside, you will think a skunk just died in
your living room, and the odor lingers for days. BTW, Alex eventually
outgrew the habit.

I found this website with several suggestions:
http://cats.about.com/od/catcare/f/catproofwiring.htm

Good luck.
Best regards,
---Cindy S.

Get some habenero hot sauce like "Dave's Insanity Sauce" and spread it
liberally on the cords.   I used the same technique to get a cat to quit
chewing drapery pullcords.

Be very very carefull not to touch your eyes if you've got the stuff on your
hands make sure you do an incredibly good job washing your hands afterwards.

Best of luck. I was advised to use bitter apple and other products to
discourage my cat Randy from chewing cables. He destroyed many a coax
cable (amateur radio), phone cable, electrical cables, etc.

But none of the offered solutions helped. So I did the next best thing.

I went to Home Depot and picked up about 30 feet of a flexible blue
conduit that was about an inch and a quarter in diameter and wrapped
that around all the critical cables.

He could try to chew it but the plastic was just hard enough that he
couldn't break through and the cables sat undamaged.

Randy had to be euthanized about a year ago, just shy of his 18th year.

The new cat Angie has been with us for 11 months now. She hasn't
exhibited any chewing behavior, though she does like to bat around my
hookup wire for my electronic projects.