“Knob and tube” wiring certainly isn’t a phrase that casual conversations are made of – and that assumes you’ve ever heard those three words strung together before. But you don’t need to know what it’s called to recognize knob and tube wiring when you see it. Knob and tube wiring has its own distinctive look, characterized by ceramic knobs nailed into wall studs or floor joists, ceramic tubes inserted into those holes, and rubber-coated wires running from knob to knob.

Knob and tube wiring first came on the scene in the 1880’s and stood the test of time for about 90 years, finally ending its run in the 1970’s. But its lack of availability today doesn’t mean that knob and tube wiring doesn’t still exist. Why is that important? Because if your home contains knob and tube wiring, it’s time to have it replaced.

Here’s why.

• It’s known for high heat dissipation that poses a fire hazard when it touches fiberglass insulation. As a result, the NEC (National Electrical Code) now requires that knob and tube wiring cannot be used in “hollow spaces of walls, ceilings and attics where such spaces are insulated by loose, rolled or foamed-in-place insulating material that envelops the conductors.”
• Many insurance companies charge higher premiums for homes with knob and tube wiring, while others will deny you coverage until you have it replaced.
• Knob and tube wiring has rubber vs. plastic insulation. Once the rubber degrades, the inner wiring is exposed, thus increasing the likelihood of an electrical short or fire.
• Knob and tube wiring was designed to accommodate no more than 12 circuits. When more circuits are added to the system, there’s an imminent risk of overloading.

What kind of electrical wiring runs through your house?  If you aren’t certain, contact Excel Electric so we can quickly and definitively make that determination for you. At the same time, if you’re planning to remodel your home or build an addition, we can handle all the wiring up to code, and up to the highest standards of safety. Contact us today to learn more or schedule service.