I use a serge protector on my machine when I am sewing somewhere my machine cord can't reach. If I am sewing at home my machine cord reaches the wall plug. Since I don't leave my machine out all the time, I don't think it's a problem. But when I set up my sewing room (in the process of it now), I will use a serge protector because the wall plugs are few and far between and will need the length of cord the protector will give. The house was built in the 1950's and there are not enough plugs or closets!