All I can think of is pet repellent....the trouble is, what the kind I've
gotten here in UK is pretty repellent to people, too!  But if you can find
one you can stand, or maybe something natural but strong smelling, try that;
someone suggested cayanne pepper to me, and I know cats generally don't like
the smell of citrus, either, so you could get a natural orange spray (Trader
Joe's has one), or some orange oil.  That's the only thing I can think of,
finding something smelly which is not unpleasant to you, but too strong for
the cat, and distribute it liberally in the area around the wires!  We've
had this problem with our rabbit, I'm surprised he hasn't gone up in a puff
of blue smoke by now....!

Good Luck,
Ann

"bitter apple" spray stuff from the pet store does the trick, at least it did
for my cat.  

rub each wire with Vic Vapour rub... or you can in case them with pipe
insulator which we have done on back of pc's and TV where its difficult for
us to get too.... antimate spray for dogs also helps

Easy really, you have number of choices, and I always go for more natural
ones, or much hated foils:

1. Wrap/place some aluminium kitchen foil around them for a while. Cats hate
aluminium foil

2. Rub some spicy sauce on them for a while(then clean it later of course

viraety of spices and smells and see what she/he hates the most! :)

Gee