http://www.mrelectricofwinnipeg.com Do I have knob and tube in my house?
If your house was built before 1950, you might have knob and tube in your house and not know it. Because knob&tube wiring is largely hidden behind walls, floors, and ceilings, and because homeowners tend to have done partial electrical upgrades over the years, it is advisable have an electrician visit your house and tell you if you have knob&tube. Signs that knob and tube is present include 2-prong outlets and no junction boxes for electrical devices, although there are more determining factors.
Mr. Electric of Winnipeg can determine if you have knob and tube in your house.