Knob & Tube Wiring

Knob and tube wiring is commonly found in homes over 60 years of age and consists of single hot  and neutral  wires, separated by knobs (or insulators) and ceramic tubes.

Knob and tube wiring is considered a higher risk than contemporary wiring installations mainly because

• there is no ground wire (in contrast to contemporary wiring)
• the exposed wires in attics and basements  are highly susceptible to wearing and physical damage
• the wires sheathing becomes brittle due to heat and exposure over time
• much of the systems wires are enclosed in the walls and cannot be inspected
• this system is not easily altered and handyman type repairs can be dangerous

As a result, you may be required to replace all exposed knob and tube wiring with approved permanent wiring material before an insurance company will provide you with homeowners insurance coverage.

Note: Some insurers may consider covering homes with wiring issues if they are inspected by the Electrical Safety Authority and deemed safe. It’s best to speak to your insurance representative about your specific situation.