if your techie stuff can handle all being turned off at once I suggest ( and have done myself so I know it works) -
One super strength spray bottle found at home depot
hot pepper powder
Combine about 1 cup of vinegar and several heaping tablespoons of pepper to almost hot water. Just warm enough to help dissolve that pepper
Spray the HELL out of those wires and the floor around the wires.
If cat is stubborn enough to get past the vinegar smell, one simple nip with that dried pepper powder will send him scurrying.
I have a chew on everything kind of kitty too. I didnt want him eating my plastic christmas tree so I used that spray on the b ottom branches where he could reach and one bite.. he ran off and hid.... never touched it again
Iforgot to add, though I am sure you know this... turn everything off while you spray. I am not taking responsibility for you shocking yourself.