How to Replace the Old Knob and Tube Wiring in Your Home

How to Replace the Old Knob and Tube Wiring in Your Home


Replacing the old knob and tube wiring in your home can seem like a daunting task, but it is important for safety and functionality. This type of wiring was used in homes built before the 1930s and can pose fire and shock hazards if left in place. With proper planning and precautions, I was able to completely rewire my home. Here is an overview of the process I used to remove the old wiring and install new electrical wiring in my house.

Dangers of Knob and Tube Wiring

Before starting any work, it's important to understand why knob and tube wiring needs to be replaced. This old wiring has paper insulation on the wires rather than plastic or rubber. Over time, the insulation becomes brittle and cracks, exposing the inner conductor. This can allow wires to arc or spark, creating a fire hazard.

The wires are also not grounded, meaning there is an increased risk of shock if one of the wires becomes damaged. If appliances aren't grounded properly, a shock can occur.

Other issues include:

Replacing this outdated wiring eliminates these risks and allows your home's electrical system to function safely and effectively.

Planning the Rewiring Project

Before getting started, carefully plan the project to make sure it goes smoothly:

Removing Old Knob and Tube Wiring

Once the prep work is complete, it's time to remove the outdated wiring. This involves carefully taking it out section-by-section:

Running New Wiring

The fun part is finally installing fresh new electrical wiring throughout your home:

Finishing Touches

Once the new wires are run, installed, and tested, put things back together:


While rewiring an entire home is no small task, it can be done successfully with proper planning and care. The peace of mind and increased home safety after replacing outdated knob and tube wiring is well worth the effort. Just be sure to educate yourself on the process fully and consult electrical experts so the project goes smoothly from start to finish. Your home will be much safer with a modernized electrical system.