Hah, I was just going to talk about power conditioners.
My DH makes electronic music, so he has a lot of electronic hardware in his home studio, and he uses UPS's, surge protectors, and power conditioners to keep everything safe.
I don't have one in my sewing studio, but I really should. When I'm heating up my iron and sewing at the same time, my machine slows and when the iron element kicks on. I don't think that's good for either appliance.