"' Aluminium conductor steel-reinforced cable "'( ACSR ) is a type of high-capacity, high-strength stranded conductor typically used in overhead power lines.
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Aluminium conductors are still used for bulk power distribution and large feeder circuits, because they cost less than copper wiring, and weigh less, especially in the large sizes needed for heavy current loads.
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This is sometimes addressed by coating aluminium conductors with an antioxidant paste ( containing zinc dust in a low-residue polybutene base ) at joints, or by applying a mechanical termination designed to break through the oxide layer during installation.
