WHY KNOB & TUBE WIRING IS A PROBLEM
Knob and tube wiring was commonly used in from 1880’s to the mid 1940’s. There are three main issues with this type of wiring. First, the wire is rated for 15 amps however, many newer appliances require a higher load to properly operate. The second & third reasons are safety concerns the outer sheathing of the wire is prone to deteriorate and once it does it exposes the bare wire and that is both a fire hazard and could electrocute someone. lastly, it the wire is not grounded and in the event of a short circuit, there is no ground to safely reroute the current. getting in front of this problem will save you a lot of headache down the road. Those who are able to get in front of the problem completely replace the Knob & Tube wiring with modern copper wiring. Although this process requires electricians behind walls and in ceilings, the temporary mess is not only responsible but costs a fraction of the price the potential damages would.
If you are unsure whether or not your home is using a K&T system, you will want to check around your furnace room.
IDENTIFY KNOB AND TUBE WIRING.
There are a few ways of identifying K&T wiring, the best way is visually inspecting it, K&T has distinct white ceramic knobs that attach the wiring to the studs/joists (pictured below). If you can’t see the wiring check what year your home was built, if your home was made between the 1880 – 1945, it’s at one point has had knob & Tube wiring and it may not have been replaced. we typically see this in the older neighborhoods of Toronto, ie Rosedale, Beaches, some parts of Downtown. If you find your home is running K&T wiring and wish to remove it, give Koala Electrical a call today for a free quote.
The average cost to remove and replace the knob and tube wiring for an average home in Toronto is between $10,000.00 – $20,500.00. There are certain insurance companies that refuse to insure homes with knob & tube wiring as they are considered high risk. When looking to buy or sell a home with knob and tube wiring it tends to sell for significantly less than the cost of replacing the wiring.