What is a major concern with electrical systems using aluminum conductors?

A significant concern with electrical systems that use aluminum conductors is their high susceptibility to corrosion. Aluminum, while being lightweight and cost-effective as an electrical conductor, can easily react chemically with oxygen, leading to the formation of aluminum oxide. This oxide layer can impede conductivity, resulting in increased resistance at connections and joints. Over time, corrosion can weaken the electrical connections, potentially leading to overheating, arcing, or even electrical fires.

The other aspects, such as lower conductivity compared to copper, while true, are less of a major concern in the context of corrosion. Additionally, aluminum can generate heat, but this is not necessarily a primary issue unless compounded by poor connections due to corrosion. The weight of aluminum conductors, although lighter than copper, is not a typical concern in electrical systems compared to the reliability and safety issues posed by corrosion. Therefore, the susceptibility to corrosion stands out as a critical concern in the use of aluminum conductors in electrical systems.