Every year, almost half of all house fires that are reported across America involve a light switch, an ignition switch, or another minor electrical malfunction that turns into a roaring blaze. Homes that still do not have ground fault circuit interrupters, or GFCIs, have a much higher instance of home electrocution incidents. When to call an electrician? The startling answer could be: right now. Faulty wiring, especially in homes that are more than about 40 years old, account for about two-thirds of all residential fires that were studied recently. Frayed cords and plugs to electrical appliances started about 10% of…