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Wikipedia definition
1. Aluminium conductor steel-reinforced cableAluminum conductor steel-reinforced cable (ACSR cable) is a specific type of high-capacity, high-strength stranded cable typically used in overhead power lines. The outer strands are aluminum, chosen for its excellent conductivity, low weight and low cost. The center strand is of steel for the strength required to support the weight without stretching the aluminum due to its ductility. This gives the cable an overall high tensile strength.
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