There is a not so modern invention called a "circuit breaker"! But, for those that would not feel comfortable in this, I would, as Kevin has alerted, get a trained perfessional to do this. My point , again, I think all of our money is better served improving what runs through our walls more than an expensive line conditioner. I AM NOT SUGGESTING TO ANYONE TO GO OUT AND DO THIS ON THERE OWN! I am saying to maximize this flow in your walls and you will be amazed!