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Knob & Tube Wiring Replacement

knob tube wiring replacement

Electrical Service Pros specializes in knob & tube wiring throuhgout Massachusetts.

What Is Knob & Tube Wiring?

From 1880’s it was widely used through the 1930’s. In some locations throughout Massachusetts, it has been installed into the late 1950’s. Years ago there were few electrical appliances, electricity usage and loads were limited. Knob & Tube was the best and only option.

The wires were spliced and soldered together inside walls, without junction boxes and then wrapped with electrical tape. Wiring was rubber and cloth covered #14 copper mounted on porcelain Knobs nailed to the wood studs and joists. When required to pass through these members porcelain Tubes were inserted in holes with the conductors inside. Knob and Tube wiring therefore never touched the wood structure or plaster. Heat from load or overload dissipated in the air space between rafters and partitions. These circuits originally could be fused by 20 Amp plug fuses. Do not use fuses or breakers over 15 Amp today.

Visual inspection of conductors and splices can determine state of K&T integrity nowadays. Conductors with bare or dry, crumbling or stiff insulation should be replaced. These conditions resulted from over-current, shorts, improper fusing, or high temperatures. Problems are usually found in switch, plug, and junction boxes, in attics, furnace or boiler rooms and above the lights especially.


Why Replace Knob & Tube Wiring?

Massachusetts homeowners should have any active knob and tube wiring inspected for safety.

Electrical Service Pros, Inc. recommends the removal and replacement of all knob and tube wiring to upgrade to current electrical standards. Our professional electricians can do this electrical inspection for you and provide an expert opinion on replacement of your knob and tube. We can help with:

  • Knob and Tube Replacement / Removal
  • Knob and Tube Wiring Audits / Inspections
  • Knob and Tube Wiring Assessments for Insurance Purposes
  • Knob and Tube Wiring Repairs

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If you are looking to replace the knob & tube wiring in your Massachusetts home, please call 413-642-6626 or complete our

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