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Knob-and-tube wiring can be found in homes from the early 1930's and older.
It gets its name from the cloth wrapped hot and neutral wires that travel separately and use white porcelain knobs and tubes to secure to and pass through wood members in the house.
Another consideration when debating replacing your knob-and-tube wiring is the cost of fire insurance for your home.
Insurance companies typically charge more if your house is known to have knob-and-tube wiring, because there is an increased risk of fire associated with older wiring.
However, it's rare to see knob-and-tube wiring that satisfies these three requirements.
You may notice knob-and-tube wiring in the attic or basement of your home, but more than likely, there is plenty of it buried in the walls, as well.Knob-and-tube wiring is generally considered acceptable for a home if it's in good condition, doesn't have newer wiring spliced onto it to provide additional outlets, and is not buried in insulation.The simple answer to updating your knob-and-tube wiring is: yes.Talk to a professional if you have questions or concerns about the process and what's involved to get your home's electric wiring up to date.Safety is something to consider with knob-and-tube wiring.
You may have noticed many of the outlets in older homes only have two slots.