Is copper allowable for direct contact with aluminum in lightning protection systems?

In lightning protection systems, it is essential to consider the potential for corrosion and galvanic reactions when connecting different metals. Direct contact between copper and aluminum is generally discouraged due to the risk of galvanic corrosion. When copper and aluminum are in contact, an electrochemical reaction can occur, leading to accelerated deterioration of the aluminum.

This reaction is particularly problematic in conductive environments or when moisture is present, as it can compromise the integrity of the connections over time. Hence, the standard practice is to avoid direct contact between these two metals unless specific protective measures, such as insulating barriers, are employed. Such measures help mitigate the risks associated with the galvanic corrosion that arises from the interaction of dissimilar metals. As a result, the choice that asserts that copper is never allowable for direct contact with aluminum reflects a cautious approach to ensuring the long-term reliability and safety of lightning protection systems.