Zippy the Wonder Turtle wrote:
How dangerous is it to have old knob and tube wiring in your home?


It depends on where it is and what you have connected to the circuit. For
example, if it is covered by insulation in an attic or some such place, you
should replace it as it may overheat. You're probably OK with typical
lights and low-power devices connected to such a circuit, but I'd worry
about large and/or high-power devices.