If an alum wire has the same conductivity as copper, what percentage of strength does it retain?

The correct answer indicates that aluminum wire retains approximately 75% of the strength of copper wire when their conductivity is equal. This comparison is crucial because while aluminum and copper have different physical properties, their application in electrical wiring often necessitates consideration of these properties alongside conductivity.

Aluminum is significantly lighter than copper, which makes it a popular choice in many applications despite its lower tensile strength. When considering conductivity, aluminum can be made to match copper's conductivity by increasing its cross-sectional area, but this relationship does also bring into play the mechanical characteristics. When the conductivity is adjusted so that both wires perform similarly in terms of electrical transfer, aluminum will retain around three-quarters of copper's strength due to its inherent material properties and composition.

Understanding this concept is essential for linemen as they are often required to select materials based on both their electrical and mechanical performance characteristics to ensure safety, efficiency, and durability in wiring installations.