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I know that copper is a better conductor than aluminum. How much lower is aluminum’s electrical conductivity?

April 26, 2017aluminum conductivity conductor Copper electrical lower

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I know that copper is a better conductor than aluminum. How much lower is aluminum’s electrical conductivity?

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The conductivity of electrical conductor grade aluminum wire (Alloy 1350-0) is 61.8% of the equivalent cross-sectional area of annealed ETP copper. Therefore aluminum wire must have 1.6 times the cross sectional area for a given copper wire in order to achieve a comparable DC resistance.