The answer to 'how long does electrical wiring last' is that electrical wiring can last for decades with proper installation and maintenance. Properly installed wiring in homes is designed to last for the life of the home, which is typically 30-50 years or more. However, the lifespan of electrical wiring can vary depending on the type of wiring, the environment it is installed in, and how well it has been maintained over time.
Copper wiring, which is the most common type used in homes, is very durable and can last for 50-100 years or more if not damaged. Aluminum wiring, which was used in some homes built in the 1960s-70s, has a shorter lifespan of 30-40 years due to the risk of issues like oxidation and loose connections. Proper maintenance, such as regularly inspecting wiring and addressing any problems, is key to maximizing the lifespan of electrical wiring in a home.