Just add $ 500 to the cost of every house that gets wired. Not counting the call backs for nuisance tripping and the fact that multiwire brach curcuits will be history. I believe that if this product is so wonderful that customers would demand it and the insurance company would cut your premiums in half for having them installed. ( It all started with bubble covers.) Put it in the Code to sell the product. Alan-- Send a Comment Form to NFPA to stop the madness.