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Safe and Reliable Knob and Tube Wiring Service By Bob Tusky

Knob and tube wiring business of Bob Tusky is dedicated to providing secure and reliable electrical solutions for homes with outdated electrical infrastructure. This article will go through the concept of knob and tube wires, the cost of replacing it, why it needs to be done, safety concerns, and the challenges of replacing knob and tube wires in plaster walls.

Knob And Tube Wiring Service

What is Knob and Tube Wiring?

Knob and tube wiring was an early electrical wiring system commonly used in residential properties from the late 19th century to the mid-20th century. It consists of porcelain knobs and tubes through which electrical wires are threaded, keeping them separate and preventing potential hazards. While knob and tube wires served its purpose at the time, it is now considered outdated and potentially unsafe.

Definition and Historical Background

This type of wiring wiring is an early electrical wiring system commonly used in residential properties from the late 19th century to the mid-20th century. It gets its name from the porcelain knobs and tubes used to secure and protect electrical wires.

During the late 1800s and early 1900s, electricity was becoming more widely available, and knob and tube wires emerged as a popular method for bringing electrical power into homes. It was a significant advancement from the previous method of gas lighting, providing a safer and more convenient way to power appliances, and lighting fixtures, and rewire a house.

Components and Features of Knob and Tube Wiring

This type of wiring is an early electrical wiring system, consists of several key components and features that distinguish it from modern electrical systems. Understanding these components is essential for recognizing and assessing knob and tube wires in older homes. Here are the main components and features:

Porcelain Knobs:

Knob and tube wires utilized porcelain knobs as a means of supporting and securing the electrical wires. These knobs were typically mounted on wooden beams, walls, or other structural elements. Their purpose was to elevate the wires and keep them separated from potentially flammable materials.

Porcelain Tubes:

Along with the porcelain knobs, the knob, and tube wires employed porcelain tubes. These tubes acted as protective insulators for the wires as they passed through wall cavities, floors, or other areas where the wires needed to be isolated. The tubes helped prevent the wires from coming into contact with structural elements, reducing the risk of electrical damage or hazards.


Knob and tube wires typically utilizes two types of wires. The first was the “hot” wire, which carried the electrical current from the power source to the electrical fixtures. The second wire served as the neutral conductor, providing a return path for the electrical current back to the power source. Knob and tube wires commonly employed copper conductors, though sometimes aluminum was used.

Ceramic Insulators:

In addition to the porcelain knobs and tubes, knob and tube wiring featured ceramic insulators at various points along the wires’ path. These insulators, often in the form of small ceramic caps or sleeves, provided additional protection and insulation for the wires where they passed through walls, floors, or other openings.

Open Wiring Design:

Unlike modern wiring systems where the wires are enclosed within the protective sheathing, knob, and tube wiring had an open wiring design. This meant that the wires were exposed and visible throughout the building’s structure. While this made it easier to access and make changes to the wiring, it also presented potential safety hazards if the wires were not adequately protected or if the insulation became compromised over time.

It’s important to note that while knob and tube wiring served their purpose during the time it was widely used, advancements in electrical technology and safety standards have made it outdated and potentially unsafe for modern electrical needs. Replacing knob and tube wiring with modern, code-compliant electrical systems is recommended to ensure the safety, efficiency, and compatibility of the electrical infrastructure in older homes.

Knob and Tube Wiring Replacement Cost

When considering the replacement of knob and tube wiring, the cost is a significant factor. Several elements contribute to the overall cost, including the size of the property, the extent of the wiring system, accessibility, and labor charges.

Factors Affecting the Cost of Replacing Knob and Tube Wiring

Property size: The square footage of the property affects the total length of wiring that needs replacement, which impacts the cost.

Complexity: The complexity of the wiring system, including the number of circuits and the presence of inaccessible areas, can affect the cost.

Materials: The cost of materials, including wiring, junction boxes, and other necessary components, adds to the overall expense.

Labor charges: Hiring professionals for knob and tube wiring replacement incurs labor costs, varying based on the expertise and location of the service provider.

Average Cost Estimates and Budget Considerations

Knob and tube wiring replacements can cost between $4,000 and $15,000 for a medium-sized home. However, it is essential to consult with a qualified electrician or electrical contractor to obtain accurate cost estimates tailored to your specific situation. Setting a realistic budget is crucial to ensuring a smooth replacement process.

Knob and Tube Wiring Replacement

Replacing knob and tube wiring is essential for the safety and efficiency of your electrical system. While it may seem like an overwhelming task, professional assistance can make the process more manageable.

Importance of Replacing Knob and Tube Wiring

  1. Safety concerns: Knob and tube wiring can pose various safety risks, including insulation degradation, overheating, and fire hazards.
  2. Inadequate electrical capacity: Knob and tube wiring was designed for lower electrical demands. Upgrading to modern wiring systems allows for safer use of electricity without overloading the circuits.
  3. Insurance and resale considerations: Many insurance companies may refuse coverage or charge higher premiums for homes with knob and tube wiring. Replacing it can enhance your home’s insurability and resale value.

Process and Steps Involved in Replacement

  1. Electrical assessment: A professional electrician will inspect the existing knob and tube wiring, identifying potential issues and developing a replacement plan.
  2. Wiring replacement: The electrician will carefully remove the old wiring and install modern, code-compliant wiring systems.
  3. Upgrading components: In addition to replacing the wiring, electrical panels, outlets, and switches may be necessary to ensure compatibility and safety.
  4. Inspection and certification: After the replacement, the electrical work should be inspected by a qualified inspector to ensure compliance with local regulations

Is Knob and Tube Wiring Safe?

While knob-and-tube wiring was once considered a standard electrical solution, it is now considered outdated and potentially hazardous.

Potential Safety Concerns and Risks Associated with Knob and Tube Wiring

Insulation degradation: Over time, the insulation covering the wires can deteriorate, leaving exposed live wires, and increasing the risk of electrical shocks and fire hazards.

Overheating: Knob and tube wiring is not designed to handle modern electrical loads, making it more prone to overheating and potentially causing fires.

Lack of grounding: Knob and tube wiring does not provide a grounding conductor, which is necessary for protecting against electrical faults and ensuring personal safety.

Understanding the Limitations and Outdated Nature of Knob and Tube Wiring

Due to the potential risks associated with knob and tube wiring, it is crucial to consider replacement options. Upgrading to modern wiring systems that meet current electrical codes is the best way to ensure the safety and efficiency of your home’s electrical infrastructure.

Replacing Knob and Tube Wiring in Plaster Walls

Replacing knob and tube wiring in homes with plaster walls presents unique challenges. However, with proper techniques and professional expertise, it is possible to replace the wiring without compromising the integrity of the walls.

Challenges and Considerations when Dealing with Knob and Tube Wiring in Plaster Walls

Accessibility: Accessing the knob and tube wiring within plaster walls can be more challenging than in homes with other wall materials.

Wall preservation: Preserving the aesthetic appeal of plaster walls while replacing the wiring requires careful planning and execution.

Minimizing the damage: Skilled electricians utilize techniques such as fishing wires and utilizing existing access points to minimize the need for extensive wall repairs.

Techniques and Best Practices for Replacing Wiring in Plaster Walls

Thorough planning: Assess the existing wiring layout, identify access points, and develop a strategy for replacing the wiring with minimal damage.

Fishing wires: Skilled electricians use specialized tools and techniques to fish new wiring through existing access points without causing significant damage to plaster walls.

Patching and repairs: Inevitable damage to plaster walls during the replacement process can be repaired using appropriate patching techniques to restore the wall’s appearance.

Signs That You Need Bob Tusky's Knob and Tube Wiring Service

Identifying whether your home has knob and tube wiring is the first step in determining if you need the services of an expert like Bob Tusky. Here are some signs that indicate the presence of knob and tube wiring:

Visible Knob and Tube Wiring:

If you notice exposed knob and tube wiring in your basement, attic, or wall cavities, it clearly indicates that your home has this outdated system.

Old Age of the Property:

If your home was built before the 1940s, there’s a high likelihood that it contains knob and tube wiring.

Frequent Electrical Issues:

If you experience frequent power outages, blown fuses, or tripped circuits, it could be a result of the limitations of knob and tube wiring.

Ungrounded Outlets:

Knob and tube wiring lacks a grounding conductor, which means that any outlets in your home will not be grounded. This can pose safety risks and limit the use of modern appliances.

If you observe any of these signs, you must reach out to an expert like Bob Tusky’s Knob and Tube Wiring service to assess your electrical system and recommend appropriate solutions. Bob Tusky also provides:

Copper Wiring Service

Home Automation Service

Electric Heating System


Bob Tusky’s Knob and Tube Wiring Service is your trusted partner when it comes to ensuring the safety, reliability, and efficiency of your home’s electrical system. With their experience and expertise in dealing with knob and tube wiring, you can rest assured that your electrical needs will be met with the utmost professionalism. Don’t compromise on safety, Contact Bob Tusky for knob and tube wiring service today and experience the difference!


What are the signs that indicate the presence of knob and tube wiring?

Signs include visible porcelain knobs and tubes, outdated electrical panels, and cloth-covered wiring.

Can I replace the knob and tube wiring myself?

It is highly recommended to hire a professional electrician with experience in knob and tube wiring replacement for safety and code compliance.

How long does it take to replace knob and tube wiring in an average-sized house?

The duration depends on various factors, such as the complexity of the wiring system and accessibility, but it typically takes several days to a few weeks.

Are there any grants or financial assistance available for knob and tube wiring replacement?

Some local governments and organizations offer grants or financial assistance programs for knob and tube wiring replacement. Research local resources and incentives in your area.

Will replacing the knob and tube wiring increase the value of my home?

Yes, replacing knob and tube wiring with modern electrical systems enhances the safety, functionality, and market value of your home.

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