Which risk increases when dissimilar metals connect directly on an external power transformer enclosure panel?

💡 Explanation

When dissimilar metals connect, galvanic corrosion occurs because of differing electrochemical potentials leading to oxidation of one metal and weakening the joint's mechanical strength. Therefore galvanic corrosion is the risk, rather than eddy currents, hysteresis, or dielectric breakdown which need separate preconditions.

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