Homes built prior to World War II didn't have to meet the same requirements for power that are now a standard in home construction of recent years. With all of this generation's high-tech amenities, older wiring just can't handle today's electrical demands. Sockets and switches can wear out, breakers grow less reliable as they age, and heavy use of extension cords could lead to a fire. Squelch worry about these larger problems with a thorough electrical system inspection every 20 years. If your home doesn't meet the code, you'll want to replace the entire electrical system to avoid a major fire hazard.