Rabbit chew, it is natural. You can train them so much but unfortunately they still with chew things regardless. Yes you can bunny proof wires for their own safety, but I have friends on another forum who have trainned their buns yet they have to replace tables, cords wires, etc everynow and then.

Bunny, my rabbit has chewed through 2 modem cables and has started eating the wall. I can't leave them unsupervised in the house as they cause so much trouble.