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Know Your Home’s Wiring

Help prevent wiring from sparking an electrical fire.

Your home’s wiring is hidden, so it can be difficult to spot problems before it’s too late. However, familiarizing yourself with how wiring works and learning warning signs can help you detect issues early and avoid costly damage caused by electrical fires.

How Wiring Works
Your home’s wiring starts at the service panel, which delivers electricity to different areas of the house. The service panel also helps prevent wires from overheating and causing an electrical fire. When a surge occurs, a circuit breaker within the panel trips or a fuse blows to shut down power.

How electricity travels from the service panel throughout the house depends on the type of wiring system in place. There are three types:

  1. Knob-and-tube: This system uses porcelain tubes to protect insulated copper wire conductors and is supported by porcelain knobs nailed to the lumber.1 This type of wiring was installed in homes through the 1940s.2 Due to its age and lack of grounding, knob-and-tube wiring is considered a fire hazard.
  2. Aluminum: This was used as an inexpensive replacement for copper in the 1960s and 1970s. Though cheaper, aluminum wiring can be a fire risk because overheating can occur where the wire attaches to outlets and other fixtures.3
  3. Grounded: This system was first installed in homes in the 1940s, and it’s still used today. It’s considered the safest wiring system because it safeguards against electric shock.

Click here for more detailed information about how wiring works.

How to Identify Wiring Hazards
Have a qualified electrician periodically inspect the wiring in your home—especially if it is more than 40 years old. If you’re not sure when the wiring was last inspected, look for a date and electrician’s signature on the service panel door.

You also can regularly review your home’s electrical system for signs that wiring is failing or no longer meets your needs. Contact a professional if you notice any of the following warnings:

1. http://www.nachi.org/knob-and-tube.htm
2. Ibid.
3. The New York Times, “The Fire Dangers of Aluminum Wiring,” originally published Feb. 19, 2006 and viewed at http://www.nytimes.com/2006/02/19/realestate/19home.html?_r=0 on 2-9-15

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