Knob and Tube

Is Knob & Tube Wiring Dangerous ?

Knob and Tube Wiring, also called Open Wiring, was commonly used in the 1900’s to the late 1940’s.

If the Knob & Tube Wiring system remains unchanged, has been carefully maintained, and all repairs have been made by a licensed electrician, this wiring method would still be safe to use today. Unfortunately this is almost never the case. As the wiring ages and deteriorates, porcelain knobs and tubes may break up, old wires sag and fray, and the sheathing turns brittle and falls off, exposing the live wires.

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