I have lost 2 computers to lighting strikes. And they were just in the area. On the first one, I called the computer maker and they said, there is no surge protectors, that fully protect,from light strikes. and it can come in on the phone line connected to your computer. so when I hear or see any distant lighting, I unplug the computer stuff from the wall,and phone line, but I never thought of my sewing machine, thanks for that tip.