Many older homes throughout Sacramento, Elk Grove, Roseville, Citrus Heights, Rancho Cordova, and surrounding areas still contain knob and tube wiring. While this wiring method was once standard, it no longer meets the electrical demands or safety expectations of modern homes.
Homeowners are often unaware that knob and tube wiring exists until it is discovered during a remodel, home inspection, or insurance review.
What Is Knob and Tube Wiring?
Knob and tube wiring was commonly installed in homes built before the nineteen fifties. It uses individual hot and neutral conductors supported by ceramic knobs and tubes. At the time, this system was designed for low electrical loads such as lighting and small appliances. Modern homes use significantly more electricity, placing stress on wiring systems that were never designed for today’s demand.
Why Knob and Tube Wiring Is a Problem Today
One of the biggest concerns with knob and tube wiring is insulation. This wiring has no equipment grounding conductor and relies on open air for cooling. Over time, insulation can become brittle or damaged, increasing the risk of overheating.
Another issue is modification. Many knob and tube systems have been altered over the years to accommodate new outlets or fixtures. These changes are often done improperly, creating hidden safety hazards inside walls and ceilings. Because of these risks, many insurance companies will not insure homes with active knob and tube wiring.
Is Knob and Tube Wiring Legal?
In some cases, existing knob and tube wiring may be allowed to remain if it has not been altered. However, most upgrades, remodels, or insulation installations trigger requirements for replacement. Even when technically allowed, it is rarely recommended. Passing inspection does not always mean the system is safe or suitable for modern use.
Why Replacement Is Usually the Best Option
Replacing knob and tube wiring improves safety, reliability, and future flexibility. It allows for proper grounding, modern circuit protection, and compatibility with today’s electrical loads. Replacement also reduces the risk of insurance issues, failed inspections, and unexpected electrical problems.
What To Do Next
If your home was built before the mid nineteen fifties, it is worth having the electrical system evaluated. Identifying knob and tube wiring early allows homeowners to plan upgrades on their terms rather than reacting to inspection or insurance deadlines.
RX Electric works with homeowners throughout the Sacramento area to evaluate and replace knob and tube wiring safely and in compliance with current electrical standards.