Every player should have a line-checker in their kit. It's an AC plug that has three lights in it. You plug it into an outlet and some of the lights will be lit. You compare compare that pattern with a chart on the plug to see if the outlet is wired correctly or not. This lil' darlin' can save your life. I urge everyone to get one of these things and to use it before you plug in to an AC plug anywhere, even at home.

Most hardware stores will have them. Electrical supply shops certainly will. A few bucks is a small price to pay for the safety of you and your bandmates.