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Home wiring can last a long time, more than 50 years in many cases, but sometimes less than this. Copper wiring can last 100 years, while aluminum wiring might last 80 years. However, the protective coating around the wire needs to be considered as well. In knob-and-tube wiring, porcelain knobs are used that may create fire hazards. Moreover, cloth sheathing is common in older homes, but it can become frayed or brittle. We recommend a checkup if your home is 25 years old or more, or if you are buying a new house.

Key Takeaways:

  • Copper wiring can last for 100 years, while aluminum wiring lasts around 80 years.
  • Knob-and-tube wiring uses copper wiring, but also porcelain knobs, which can be a fire hazard.
  • Cloth sheathing, popular prior to the 1970s, is a concern because the cloth can become frayed or brittle.

“If your home is older than 25 years, yes, we recommend having our electricians examine the wiring, as well as your electrical panel.”

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