From 17 to 25 percent of all residential fires are electrically generated. One-third of ALL industrial fires have electrical causes. This condition, only recently identified and named, is NOW designated as one of the major causes of electrically originated fires in older structures. They are usually not visible because they are in the walls or at internal connections. Forensic studies have measured the heat in some glowing connections to be as much as 1400 degreases F. Electrical fires start in the wires and plugs of extensions cords and other wiring - usually from being overloaded.
Electrical fires start from frayed, uninsinuated wiring.
Electrical fires are caused by loose contacts in extension cords, receptacles, and switches.