You should call an electrician for many reasons. When you are resetting circuit breakers or changing fuses too often, when you turn on your air conditioner and the lights dim in the room, and when your lights flicker or go on and off. You should also call an electrician when you can smell something burning, when you have six electronic devices plugging into one outlet, when you have receptacle outlets overburdened by multi-plug strips, when a three-prong plug needs a two-prong adapter, and if you have to run extension cords to plug in electrical devices. There are many other reasons why and when you should call an electrician, of course, and you should always consult an electrician if you ever have electrical questions.