UA-202538241-1 ommonly used in homes across the country from as far back as the 1880s through to the 1940s, knob-and-tube wiring is old news. So old in fact, many don’t even consider it may be lurking within the walls of their older home. Unfortunately, because wiring is tucked away in the basement, attic, or spider webbed within the walls of a home, the dangers of outdated knob-and-tube are often overlooked - despite the fact it still exists, hidden, in many of America’s historic homes.