Why is it important to avoid contact of dissimilar metals in electrical installations?

Dissimilar metals in electrical installations can create galvanic corrosion when they are in contact with one another, especially in the presence of moisture. This reaction occurs because each metal has a different electrochemical potential, leading to one metal corroding faster than the other. Over time, this corrosion can weaken connections, create high resistance points, and even lead to failure of electrical components.

Minimizing corrosion is crucial for ensuring the longevity and reliability of electrical installations. By avoiding direct contact between dissimilar metals, you help maintain the integrity of the system, reduce the likelihood of equipment failure, and enhance overall safety. This practice is especially important in environments that may be exposed to moisture or corrosive elements, where the effects of galvanic action can be accelerated. Ensuring safety by minimizing such risks is a fundamental principle in electrical installation.