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What is rag wiring?
Sunday, January 3, 2021
Up until the mid-20th century, electrical wiring was insulated with rubber embedded with cloth, which some electricians call “rag wiring.” The material had two safety problems: 1) The rubber hardens, cracks, and pieces start to break off over time, especially in a hot attic, and 2) The cloth-rubber combination has a low thermal resistance and can melt or catch fire when the wires overheat.
An example of rag wiring is shown above, mixed with the newer thermoplastic insulated wiring that replaced it, in an electrical panel. To learn more about rag wiring, go to our blog post Is all cloth wiring dangerous?
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