Visible smoke or a burning smell are perhaps the most obvious signs and indications of an electrical fire hazard. Smoke occurs for a number of overheating reasons: overloading, faulty wiring, frayed wiring, old plug-ins, etc. Regardless of the cause, if you notice smoke, be sure to quickly disconnect all appliances and search for the cause. To be extra cautious, consider shutting off the power to your home via the circuit breaker, then call a certified electrician. A clear sign of overheating is the discoloration around a socket, light switch, or light fixture. Other hazardous signs include emitted sparks when plugging in devices, appliances or outlets feeling hot to the touch, and the feeling of electric shock when plugging in power cables.