The answer to 'lifespan of electrical wiring' is that most electrical wiring in homes can last for 50-70 years or more with proper installation and maintenance. However, the actual lifespan can vary depending on the type of wiring, environmental conditions, and how the wiring is used.
Copper and aluminum wiring are the most common types used in homes and generally have a very long lifespan when installed correctly. Older knob-and-tube or aluminum wiring may need to be replaced sooner due to safety concerns. Proper electrical maintenance, such as regularly inspecting for damage and upgrading outdated systems, can help maximize the lifespan of your home's wiring.