Wiring and componentsQuestion 449 of 1506

Why is a zinc-plated steel crimp sleeve a poor match for aluminum wire?

  1. The sleeve cannot be crimped on aluminum
  2. Aluminum melts at crimping temperatures
  3. Electrolysis can occur between the two metals
  4. The sleeve has too much insulation
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Correct answer: Electrolysis can occur between the two metals

Dissimilar metals in contact can corrode each other.

Source: Electrical Fundamentals Competency (Industry Training Authority of BC), 9.3: Solderless connectors

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Questions last reviewed: 18 October 2026