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Knob and Tube Wiring Was the Standard Between 1880 and 1930


What really is this type of wiring?

It was an early standardized electrical wiring installation method used primarily in North America from about 1880 to 1930.  The wires were suspended with porcelain knobs that helped in dissipating heat.  The use of porcelain tubes provided additional protection of the wires by lining holes through the wooden floor joists.

This form of wiring is usually found in homes with older 60 amp services, and is now considered to be an obsolete system that can present a safety hazard.

These are some facts that may help you in making decisions about whether your older home may require wiring replacement:

  • With no ground wire it cannot service three-pronged appliances
  • Poses fire hazards associated with insulation breakdown around the wiring
  • Some insurance companies now refuse to insure homes with this wiring


If your older home is currently wired with this system, we recommend replacing it to avoid the risk of house fires or injuries.  Call Reinhart Electric for knob and tube wiring replacement services.  206-602-2202


When Should You Replace Knob and Tube Electrical Wiring?


Its use is the oldest type of home wiring.  It gets its name from cloth-covered wires connected with porcelain knobs for properly securing the wires.  Porcelain tubes were used to protect the wires passing through studs or joists. 

When questioning its safety, the answer is usually that it is not safe for a number of reasons.  The most serious problem associated with this old wiring system is caused by adding more wiring to it.

We recommend wiring replacement as the best solution for safety from potentially faulty electrical wiring that includes:

  • Removal of the old wiring
  • Replacement of the entire system with new copper wiring
  • An upgrade to a 100 amp service or greater
  • Essential proper grounding and bonding
  • Replacing old ungrounded receptacles with CSA approved devices


Even though your old system may seem to be working well, improper or unsafe alterations or splicing may have been made over the years creating a potential safety hazard.  We recommend knob and tube wiring replacement of the entire system as a safety precaution.


Why Choose Us for Knob and Tube Wiring Replacement?


If your vintage home was built before 1930 and still has its original wiring, as a safety precaution it may be wise to completely replace it.

As professional electricians providing premier electrical services, you will receive:

  • Licensed and certified professionals
  • Guaranteed services
  • Trustworthy, quality workmanship of a dependable family-owned business
  • Extensive experience of electricians since our company founding in 2007
  • Complete knowledge of electrical systems and installations


Call Reinhart Electric for expert knob and tube wiring replacement of your outdated wiring.  206-602-2202